Watlow Electric 988 manual

Series 988 1/8 DIN Microprocessor-Based T emperature/Process Controller 0600-0009-0001 Rev V December 1997 Supersedes: W988-XUMN Rev U00 $10.00 Made in the U.S.A. Printed on Recycled Paper 10% Postconsumer Waste User ’ s Manual Includes 986, 987, 988 and 989 User Levels: • New User ........................... go to Introduction • Experienced [...]

Series 988 User ’ s Manual Includes 986, 987, 988 and 989 The Series 988 User’s Manual is copyrighted by Watlow Winona, Inc., © 1997, with all rights reserved. (1233)[...]

WATLOW Series 988 User’s Manual Table of Contents T able of Contents Introduction to the Watlow Series 988 Controllers ii Using this Manual ii Document Every Step iii Notes, Cautions and Warnings iii Technical Assistance iii We Value Your Feedback Chapter 1 Hardware Setup 1.1 Dip Switch Locations and Functions Chapter 2 Installation and Wiring 2.[...]

WATLOW Series 988 User’s Manual i Introduction Introduction to the W atlow Series 988 Controllers Figure Int.1 - The Series 988 Controllers. Watlow’s Series 988 controllers set a new standard in the controller indus- try by packing an impressive array of features into an 1/8-DIN package. No other controller offers the flexibility, compact size [...]

ii WATLOW Series 988 User’s Manual Introduction Introduction Using this Manual This manual provides the information you will need to install and operate a Series 988 controller. If you need information about Series 988 configurations and model num- bers, refer to the Appendix of this manual or, for more detailed informa- tion, to Optimizing Your [...]

Introduction WATLOW Series 988 User’s Manual iii Introduction Notes, Cautions and W arnings We use note, caution and warning symbols throughout this book to draw your attention to important operational and safety information. A bold text “ NOTE ” marks a short message in the margin to alert you to an important detail. A bold text “ CAUTION [...]

WATLOW Series 988 User’s Manual 1.1 Hardware Setup, Chapter 1 Chapter 1 Hardwar e Setup DIP Switch Locations and Functions The Watlow Series 988 has at least one and as many as six dual in-line package (DIP) switches inside the controller, depending on the model number. They allow users to configure the controller for a variety of input sensors, [...]

1.2 WATLOW Series 988 User’s Manual Hardware Setup, Chapter 1 DIP Switches Figure 1.2 - Input DIP switches. Input 1 Input 2 (98 _ _-2_ _ _-_ _ _ _) (98 _ _-_2_ _-_ _ _ _) RTD (100 Ω ) thermocouple: R, S or B thermocouple: J, K, T, N, E, C, D, Pt2 or 0-50mV (high impedance) 0-20 or 4-20mA; 0-5, 1-5 or 0-10V O N ↑ 123 O N ↑ 123 O N ↑ 123 O [...]

DIP Switches WATLOW Series 988 User’s Manual 1.3 Hardware Setup, Chapter 1 Output 2 Opt ion B oa r d a nd D I P Output 4 Opt ion B oa r d a nd D I P Co n tro lle r Ch assis Top V i e w ( 986 & 988) Le ft-si d e V ie w ( 987 & 989) Output 3 Opt ion B oa r d a nd D I P Output 1 Option Bo a r d off on on on off off Figure 1.3 - External sign[...]

1.4 WATLOW Series 988 User’s Manual Hardware Setup, Chapter 1 DIP Switches Figure 1.4 - Lockout DIP switch. no hardware lockout or (Switch 1 has no effect.) lockout Setup and Factory menus or (Switch 1 has no effect.) O N ↑ 12 O N ↑ 12 O N ↑ 12 O N ↑ 12 4. The lockout DIP switch hides the Setup Menus (Input, Output, Global and Communicati[...]

WATLOW Series 988 User’s Manual 2.1 Installation and Wiring, Chapter 2 Chapter 2 Installation and W iring Panel Cutout Maximum Panel Thickness 0.38" (9.65mm) 3.62" + 0.03 -0.00 (92mm + 0.8) 1.77 + 0.02 -0.00 (45mm + 0.6) 4.03" (102mm) 2.18" (55 mm) TL W W A PROCESS L1 L2 L3 L4 DEV % OUT DISPLAY SERIES 988 MODE AUTO MAN 4.03&qu[...]

2.2 WATLOW Series 988 User’s Manual Installation and Wiring, Chapter 2 Installation Installing the Series 988 Installing and mounting requires access to the back of the panel. 1. Make a panel cutout using the panel cutout dimensions from the previ- ous page. 2. To remove the controller chassis from its case, press in firmly on the two tabs on one[...]

WATLOW Series 988 User’s Manual 2.3 Installation and Wiring, Chapter 2 the mounting collar over the back of the control. 4. Loosen the mounting bracket screws enough to allow for the mounting collar and panel thickness. Place each mounting bracket into the mounting slots (head of the screw facing the back of the controller). Push each bracket bac[...]

2.4 WATLOW Series 988 User’s Manual Installation and Wiring, Chapter 2 Wiring Wiring the Series 988 Wiring options depend on the model number and DIP switch settings. Check the terminal designation stickers on either side of the controller and compare your model number to those shown here and with the model number breakdown on the inside back cov[...]

WATLOW Series 988 User’s Manual 2.5 Installation and Wiring, Chapter 2 Wiring Sensor Installation Guidelines Maintain isolation between input 1 and input 2 to prevent a ground loop. A ground loop may cause incorrect readings, dashes across the upper dis- play or the display of error codes. Thermocouple input: Extension wire for thermocouples must[...]

2.6 WATLOW Series 988 User’s Manual Installation and Wiring, Chapter 2 Wiring Example Figure 2.6 - System wiring example. 9 8 8 A-10 C A-AA R R rea r view (+ ) 1 0 9 2 2 2 1 1 2 1 3 (-) L1 L2 (-) 120V Å (ac) fu se 9 2 A 3 - 1DJ1 -00 00 li mi t co n tr o l h e a te r p roce ss se n so r li mi t se n sor o p t ion al n o rm a ll y o pe n momen ta [...]

WATLOW Series 988 User’s Manual 2.7 Installation and Wiring, Chapter 2 Wiring Notes L1 L2 power earth ground 11 21 22 ç WARNING: To avoid damage to property and equip- ment, and/or injury of loss of life, use National Electric Code (NEC) stan- dard wiring prac- tices to install and operate the Series 988. Failure to do so could result in such da[...]

2.8 WATLOW Series 988 User’s Manual Installation and Wiring, Chapter 2 Input 1 Wiring Figure 2.8c — 0-5V Î Î , 1-5V Î Î or 0-10V Î Î (dc) Process Universal signal conditioner 98 _ _ - 2 _ _ _ - _ _ _ _ Input impedance: 10K Ω Figure 2.8a — Thermocouple or 0-50mV (high impedance) Thermocouple only 98 _ _ - 1 _ _ _ - _ _ _ _ (no DIP swit[...]

Figure 2.9d — 0-20mA or 4-20mA Process Universal signal conditioner 98 _ _ - _ 2 _ _ - _ _ _ _ Input impedance: 7 Ω Figure 2.9c — 0-5V Î Î , 1-5V Î Î or 0-10V Î Î (dc) Process Universal signal conditioner 98 _ _ - _ 2 _ _ - _ _ _ _ Input impedance: 10K Ω Figure 2.9b — RTD (2- or 3-wire) (100 Ω ) Universal signal conditioner 98 _ _[...]

20 19 T3 T1 T2 Phase dot 3-phase using 2 current transformers Figure 2.10b — Current T ransformer Input 98 _ _ - _ 4 _ _ - _ _ _ _ The current transformer must be pur- chased separately. See Appendix for Watlow current transformer part numbers. Systems that use more than 50 Amps need an interstage transformer. For example, if you use a 300A curre[...]

WATLOW Series 988 User’s Manual 2.11 Installation and Wiring, Chapter 2 Figure 2.11a — Digital Event Input 1 Available on all units. open 14-36V Î (dc) Event Input 1 off closed 0-3V Î (dc) Event Input 1 on 23 24 + - 24 23 +24V Î (dc) 10K Ω 4.99K Ω OPTO ISOLATOR 750 Ω .01 µ f 4.99K Ω Internal Circuitry NOTE: Successful installa- tion[...]

2.12 WATLOW Series 988 User’s Manual Installation and Wiring, Chapter 2 Figure 2.12a — AC Outputs Solid-state Relay with Contact Suppression 98 _ _ - _ _ B _ - _ _ _ _ 0.5 amps, minimum off-state impedance: 20K Ω Electromechanical Relay with Contact Suppression (Suppression between NO and COM contacts only) 98 _ _ - _ _ D _ - _ _ _ _ Form C, [...]

WATLOW Series 988 User’s Manual 2.13 Installation and Wiring, Chapter 2 Output 2 Wiring Figure 2.13b — Switched DC, Open Collector 98 _ _ - _ _ _ C - _ _ _ _ Maximum voltage: 42V Î Î (dc) Maximum current: 1A 15 External Load + 16 17 - COM Figure 2.13d — 0-5V Î Î , 1-5V Î Î and 0-10V Î Î (dc) Process 98 _ _ - _ _ _ F - _ _ _ _ Minimum [...]

Figure 2.14c — Process Retransmit 0-20mA, 4-20mA, Load impedance: 600 Ω max. 98 _ _ - _ _ _ _ - M _ _ _ 0-5V Î Î , 1-5V Î Î , 0-10V Î Î (VDC) , Load impedance: 500 Ω min. 98 _ _ - _ _ _ _ - N _ _ _ 2.14 WATLOW Series 988 User’s Manual Installation and Wiring, Chapter 2 NOTE: Input-to-output iso- lation is defeated when the external si[...]

WATLOW Series 988 User’s Manual 2.15 Installation and Wiring, Chapter 2 Figure 2.15b — Switched DC, Open Collector 98 _ _ - _ _ _ _ - _ C _ _ Maximum voltage: 42V Î Î (dc) Maximum current: 1A Figure 2.15a — AC Outputs Solid-state Relay with Contact Suppression 98 _ _ - _ _ _ _ - _ B _ _ 0.5 amps, minimum off-state impedance: 20K Ω Electro[...]

WATLOW Series 988 User’s Manual 3.1 Front Panel and Display Loop, Chapter 3 Chapter 3 Front Panel and Display Loop Upper Display Indicates the actual process value, prompt parameter value or error code. DEV LED When lit, the lower display shows the most recent deviation unit from the set point. % OUT LED When lit, the lower display shows the curr[...]

3.2 WATLOW Series 988 User’s Manual Front Panel and Display Loop, Chapter 3 Display Loop Display Loop The Display Loop is the “home” state of the Series 988 controller. Pressing the Display key ∂ returns the controller to the Display Loop from any prompt in any menu. The controller automatically returns to the Display Loop from any menu whe[...]

TL W W A PROCESS L1 L2 L3 L4 DEV % OUT DISPLAY SERIES 988 MODE AUTO MAN WATLOW Series 988 User’s Manual 4.1 Setup Menus, Chapter 4 Navigating the Setup Menus To reach the Setup Menus, begin in the Display Loop and press both the Up- arrow > and Down-arrow < keys for three seconds. The Setup Menu prompt [`SEt] will appear in the lower displa[...]

4.2 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 MODE *Slidewire Hysteresis *Hunt *Linearization 2 *Software Filter 2 *RTD Calibration Curve 2 *Calibration Offset 2 *Learn High *Learn Low *Range High 2 *Range Low 2 *Decimal 2 *Remote Set Point *Input 2 *Linearization 1 Software Filter 1 *RTD Calibration Curve 1 Range High 1 Calibration [...]

Input Prompts When you are in the Setup menus, the Series 988 displays the menu selec- tion ( [InPt] , [OtPt] , [GLbL] or [COM] ) in the upper display, and [`SEt] in the lower display. The Up-arrow > or Down-arrow key < selects another menu. Press the Mode key µ to display the prompt in the lower display and its value in the upper display. U[...]

4.4 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 [`In1] Input 1 continued from previous page. Setup-Input If Default ↓ ↓ Input 1 DIP RTD RTD(0.1°) [`rtd] [`r†d] [`In1] [`In1] RTD Input 1 DIP 4-20mA 0-20mA 0-5V Î 1-5V Î 0-10V Î (dc) [4-20] [0-20] [`0-5] [`1-5] [0-10] [`In1] [`In1] [`In1] [`In1] [`In1] process Decimal 1 Select t[...]

WATLOW Series 988 User’s Manual 4.5 Setup Menus, Chapter 4 Setup-Input ˜ NOTE: These values do not affect the low or the high set point limit for process alarms. Range Low 1 and Range High 1 Select the low and high limits for input 1. These prompts limit the adjustment range for the set points. The default values are the same as the limits of th[...]

4.6 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Input ˜ NOTE: These values do not affect the low or the high set point limit for process alarms. [`rL1] [`rH1] Range Low 1 and Range High 1 continued from previous page. [``°F] [``°C] [`rL1] [`rH1] [`rL1] [`rH1] [```r] [``32] … [3200] [```0] … [1760] 98_ _-2_ _-_ _ _ only [`i[...]

WATLOW Series 988 User’s Manual 4.7 Setup Menus, Chapter 4 Setup-Input RTD (100 Ω ) Calibration Curve 1 Select the calibration curve for the RTD 1 input. The RTD input uses either the European (DIN, 0.003850 Ω / Ω /°C) or the Japanese (JIS, 0.003916 Ω / Ω /°C) linearization standard. [rtd1] This prompt appears only if you have set [`I[...]

4.8 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Input Linearization 1 Select square root linearization for input 1. [Lin1] This prompt appears only if you have set [`In1] to a process input or to a thermocouple set to [0-50] mV. Default ↓ [``no] [root] [Lin1] [Lin1] ˜ NOTE: See Chapter 8 for more information on input lineariza[...]

WATLOW Series 988 User’s Manual 4.9 Setup Menus, Chapter 4 Setup-Input ˜ NOTE: If [``no] is selected for [`In2] none of the other input 2 prompts will appear. Input 2 Select sensor type for input 2. This selection must match the sensor type connected to terminals 18, 19 and 20. See Appendix for more infor- mation about sensors. • Changing the [...]

4.10 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Input [`In2] Input 2 continued from previous page. If Default ↓ ↓ 98_ _-3_ _ _-_ _ _ _ no DIP slidewire potentiometer [``no] [SLid] [`POt] resistance [``In2] [`In2] [`In2] only 98_ _-4_ _ _-_ _ _ _ no DIP current current [``no] [SLid] transformer [``In2] [`In2] only 98_ _-5_ _ [...]

WATLOW Series 988 User’s Manual 4.11 Setup Menus, Chapter 4 Setup-Input Decimal 2 Select the decimal point location for process type input 2 data. This prompt, in conjunction with the Range Low and Range High prompts, allows you to format and limit units of measure for process 2. • All prompts with units of measure related to input 2 will displ[...]

4.12 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Input Default Default Default Default ↓ ↓ ↓ ↓ [``°F] [``°C] [`rL2] [`rH2] [`rL2] [`rH2] [```J] [``32] … [1500] [```0] … [`816] 98_ _-1_ _-_ _ _ or [`in2] [`rL2] [`rH2] [`rL2] [`rH2] 98_ _-2_ _-_ _ _ (K) [```H] [-328] … [2500] [-200] … [1371] [```t] [-328] … [`75[...]

WATLOW Series 988 User’s Manual 4.13 Setup Menus, Chapter 4 Setup-Input ˜ NOTE: See Chapter 8 for more information on slidewire feed- back. Learn Low Write the low-end resistance of the slidewire potentiometer to the range low 2 parameter. [LrnL] This prompt appears only on controllers equipped with input 2 hardware and with Input 2 [`In2] set t[...]

4.14 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Input [CAL2] [rtd2] Calibration Offset 2 Offset the input 2 signal by a positive or negative value. This allows you to compensate for lead resistance, sensor errors or other factors. [CAL2] This prompt appears only if the controller is equipped with input 2 hardware and if [`In2] i[...]

Software Filter 2 Select the filter time constant, in seconds, for input 2. This smooths a rapidly changing input signal for display or control purposes. • Select a positive value to filter only the display. • Select a negative value to filter the input signal. • Set the value to [```0] to disable the filter. [Ftr2] This prompt appears only o[...]

4.16 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Input ˜ NOTE: See Chapter 8 for more information on slidewire feed- back. [Hunt] Hunt Set the deadband, as a percentage of output, to keep the valve from hunting. • The slidewire hysteresis [SHYS] setting provides additional control over a valve. [Hunt] This prompt appears only [...]

WATLOW Series 988 User’s Manual 4.17 Setup Menus, Chapter 4 Figure 4.17 - Hunt and slidewire inner hysteresis. H unt Slidewire H y s t eres is t urn-of f point (open) t urn-of f point (c los e) t urn-on point (open) t urn-on point (c los e) s lidew ire pos it ion s et point Setup-Input ˜ NOTE: See Chapter 8 for more information on slidewire feed[...]

4.18 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Output MODE *Hysteresis 4 *Alarm 4 Side *Alarm 4 *Output 4 *Silencing 3 *Latching 3 *Hysteresis 3 *Alarm 3 Side *Alarm 3 *Output 3 *Silencing 2 *Latching 2 *Alarm 2 Side *Alarm 2 *Set Point 2 Control *Hysteresis 2 *Output 2 *Process 2 Setup Prompt Output 1 *Process 1 *Hysteresis 1 [...]

WATLOW Series 988 User’s Manual 4.19 Setup Menus, Chapter 4 Setup-Output Output Prompts When you are in the Setup menus, the Series 988 displays the menu selection ( [InPt] , [OtPt] , [GLbL] or [COM] ) in the upper display, and [`SEt] in the lower display. The Up-arrow > or Down-arrow key < selects another menu. Press the Mode key µ to dis[...]

4.20 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Output Process 1 Select the process range for output 1. [Prc1] This prompt appears only on controllers equipped with output 1 process hardware (98_ _-_ _F_-_ _ _ _). Default ↓ 4-20mA 0-20mA 0-5V Î 1-5V Î 0-10V Î (dc) [4-20] [0-20] [`0-5] [`1-5] [0-10] [Prc1] [Prc1] [Prc1] [Prc[...]

WATLOW Series 988 User’s Manual 4.21 Setup Menus, Chapter 4 Setup-Output Output 2 Set the way that output 2 will respond to a difference between the set point and an input variable. • [`AL2] de-energizes output 2 in an alarm condition. • [AL2n] energizes output 2 in an alarm condition. • [``Ht] select reverse action, so that output 2 respon[...]

4.22 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Output Hysteresis 2 Select the switching hysteresis for output 2. This determines the change in temperature or process units needed to turn the output from off to on. • If [`AL2] is set to [rAtE] settings for [HYS2] will be in degrees per minute or units per minute. • If the in[...]

WATLOW Series 988 User’s Manual 4.23 Setup Menus, Chapter 4 Setup-Output Alarm 2 Select the alarm type for alarm 2. Select the trigger points for the alarm with the [A2LO] and [A2HI] settings in the System Menu [`SYS] . • [`Pr1] uses the process signal from input 1. Changing the set point does not change the alarm response. • [`dE1] uses a de[...]

4.24 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Output Latching 2 Select whether alarm 2 will be latching or non-latching. A latching alarm [`LAt] must be turned off manually. A non-latching alarm [`nLA] turns off when an alarm condition no longer exists. [LAt2] This prompt appears only on controllers equipped with output 2 hard[...]

WATLOW Series 988 User’s Manual 4.25 Setup Menus, Chapter 4 Setup-Output Output 3 Select the alarm condition for output 3. • [`AL3] de-energizes output 3 in an alarm condition. • [AL3n] energizes output 3 in an alarm condition. [`Ot3] This prompt appears only on controllers equipped with output 3 hardware for a relay (98_ _-_ _ _ _-B_ _ _, 98[...]

4.26 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Output Alarm 3 Side Select what triggers alarm 3. • [both] triggers an alarm when the signal ≤ [A3LO] or ≥ [A3HI] . • [HiGH] triggers an alarm when the signal ≥ [A3HI] . • [LOW] triggers an alarm when the signal ≤ [A3LO] . [A3Sd] This prompt appears only on controller[...]

WATLOW Series 988 User’s Manual 4.27 Setup Menus, Chapter 4 Setup-Output Latching 3 Select whether alarm 3 will be latching or non-latching. A latching alarm [`LAt] must be turned off manually. A non-latching alarm [`nLA] turns off when an alarm condition no longer exists. [LAt3] This prompt appears only on controllers equipped with output 3 hard[...]

4.28 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Output Output 4 Select the alarm condition for output 4. • [`AL4] de-energizes output 4 in an alarm condition. • [AL4n] energizes output 4 in an alarm condition. [`Ot4] This prompt appears only on controllers equipped with output 4 hardware for a relay (98_ _-_ _ _ _-_B_ _, 98_[...]

WATLOW Series 988 User’s Manual 4.29 Setup Menus, Chapter 4 Setup-Output Alarm 4 Side Select what triggers alarm 4. • [both] triggers an alarm when the signal ≤ [A4LO] or ≥ [A4HI] . • [HiGH] triggers an alarm when the signal ≥ [A4HI] . • [LOW] triggers an alarm when the signal ≤ [A4LO] . [A4Sd] This prompt appears only on controller[...]

4.30 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Output Hysteresis 4 Select the switching hysteresis for alarm 4. This determines the change in temperature or process units needed to turn the output from off to on. • If [`AL4] is set to [rAtE] settings for [HYS4] will be in degrees per minute or units per minute. • If the inp[...]

WATLOW Series 988 User’s Manual 4.31 Setup Menus, Chapter 4 Setup-Output Silencing 4 Select silencing to inhibit alarm 4 on startup and to allow the opera- tor to reset the alarm output, not the visual display. • Silencing disables the alarm until the signal is between [A4LO] and [A4HI] . [SIL4] This prompt appears only on controllers equipped [...]

4.32 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Output Process 3 Select the range for the retransmit signal at output 3. [Prc3] This prompt appears only on controllers equipped with retransmit hardware (98_ _-_ _ _ _-M_ _ _ or 98_ _-_ _ _ _-N_ _ _) and with [Aout] not set to [``no] . Default ↓ 4-20mA 0-20mA 0-5V Î 1-5V Î 0-1[...]

WATLOW Series 988 User’s Manual 4.33 Setup Menus, Chapter 4 Setup-Output Retransmit High Limit Select the high limit for the retransmit signal at output 3. • The default value is equal to [`rH1] or [`rH2] (in the Input Menu) depending on whether [Aout] is set to [Prc1] or [Prc2] . • The decimal precision of [ACAL] is determined by [dEC1] (Inp[...]

MODE *Ramp Rate *Ramping Function Auto-tune Set Point High Power Limit Low Power Limit Annunciator *Event Input 2 Event Input 1 *Crossover Process Value *PID 2 Crossover Selection *Algorithm *Control Type *Cascade Action Setup prompt *Celsius-Fahrenheit Failure Mode Error Latching Enter your settings, from the controller's upper display. MODE [...]

WATLOW Series 988 User’s Manual 4.35 Setup Menus, Chapter 4 Setup-Global Global Prompts When you are in the Setup menus, the Series 988 displays the menu selection ( [InPt] , [OtPt] , [GLbL] or [COM] ) in the upper display, and [`SEt] in the lower display. The Up-arrow > or Down-arrow key < selects another menu. Press the Mode key µ to dis[...]

4.36 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Global Error Latching Select whether errors will be latching or non-latching. • Non-latching alarms [`nLA] turn off when there is no alarm condition. • Latching alarms [`LAt] must be turned off manually. [`Err] This prompt always appears. Default ↓ [`nLA] [`LAt] [`Err] [`Err][...]

WATLOW Series 988 User’s Manual 4.37 Setup Menus, Chapter 4 Setup-Global Cascade Action Select the control action between the inner and outer loop of a cas- cade system. • Direct action [`dir] makes the percent output from the outer loop directly proportional to the set point of the inner loop (input 2). A 100% signal in the outer loop will set[...]

4.38 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Global Algorithm Select the control algorithm. • [`Pid] selects one set of PID prompts. • [`Pdr] selects proportional/derivative control with manual reset in per- cent power. • [Pid2] selects two complete sets of PID prompts. This selection does not appear if [CntL] is set to[...]

WATLOW Series 988 User’s Manual 4.39 Setup Menus, Chapter 4 Setup-Global Crossover Process V alue Select the process value at which the control algorithm will crossover between PID A and PID B. PID A is active below this value and PID B is active above this value. • This value cannot be set lower than range low 1 [`rL1] or higher than range hig[...]

4.40 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Global Event Input 1 Select the effect of closing the event input 1 switch. • [``no] disables event input 1. • [`LOC] locks out the front panel keys. • [`ALr] resets an alarm. • [A-M] switches the controller to manual mode at the power level set at [FAIL] (Global Menu) and [...]

WATLOW Series 988 User’s Manual 4.41 Setup Menus, Chapter 4 Setup-Global Annunciator Select whether alarm messages will flash in the lower display. [Anun] This prompt always appears. Default ↓ [``on] [`OFF] [Anun] [Anun] Low Power Limit Select the low limit for the percent output. For cooling (direct acting) enter a negative number. [`LoP] This[...]

4.42 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Global High Power Limit Select the high limit for the percent output. For cooling (direct acting) enter a negative number. [`HiP] This prompt always appears. If Default ↓ ↓ [`LoP] … [`100] % a heat/cool [`HiP] [`HiP] application [`LoP] … [`100] % a heat only [`HiP] [`HiP] a[...]

WATLOW Series 988 User’s Manual 4.43 Setup Menus, Chapter 4 Setup-Global Ramping Function Select when the controller will ramp. Ramping limits the speed at which an element can heat up. Ramping is often used to protect parts that would crack or warp if they heat up too quickly. • [`OFF] sets the system to heat as quickly as possible. • [Strt][...]

4.44 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Comm ˜ NOTE: The Communications Menu appears only on controllers equipped with communications hardware (98_ _-_ _ _ _-_R_ _, 98 _ _-_ _ _ _-_U_ _ or 98_ _-_ _ _ _-_S_ _). See Data Communications with the Series 988 Family of Controllers for detailed informa- tion on communications[...]

WATLOW Series 988 User’s Manual 4.45 Setup Menus, Chapter 4 Setup-Comm Communications Prompts When you are in the Setup menus, the Series 988 displays the menu selection ( [InPt] , [OtPt] , [GLbL] or [COM] ) in the upper display, and [`SEt] in the lower display. The Up-arrow > or Down-arrow key < selects another menu. Press the Mode key µ [...]

4.46 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Comm Protocol T ype Select the communications protocol. • [FULL] selects ANSI X3.28 2.2 - A.3. • [``on] selects Xon/Xoff. • [Mod] selects Modbus [Prot] This prompt appears only on controllers equipped with communi- cations hardware (98_ _-_ _ _ _-_R_ _, 98_ _-_ _ _ _-_U_ _ or[...]

WATLOW Series 988 User’s Manual 4.47 Setup Menus, Chapter 4 Setup-Comm Interface T ype Select the interface type for Output 4, Option S. • [`485] selects EIA/TIA-485. • [`422] selects EIA/TIA-422. [IntF] This prompt appears only on controllers equipped with communications hardware for EIA/TIA-485 and EIA/TIA-422 (98_ _-_ _ _ _-_S_ _). Default[...]

TL W W A PROCESS L1 L2 L3 L4 DEV % OUT DISPLAY SERIES 988 MODE AUTO MAN WATLOW Series 988 User’s Manual 5.1 Operation Menus, Chapter 5 Navigating the Operation Menus To reach the Operation Menus, begin in the Display Loop and press the Mode key µ . Depending on the controller configuration, either the Set Point 2 prompt [`SP2] , the Idle Set Poi[...]

5.2 WATLOW Series 988 User’s Manual Operation Menus, Chapter 5 MODE *Local-remote *Alarm 4 High *Alarm 4 Low *Alarm 3 High *Alarm 2 High *Alarm 3 Low Operation Prompt *Event Input 1 Status *Event Input 2 Status *Alarm 2 Low Enter your settings, from the controller's upper display. MODE MODE MODE MODE MODE MODE MODE MODE MODE MODE Event Input[...]

Operation-System WATLOW Series 988 User’s Manual 5.3 Operation Menus, Chapter 5 System Prompts After you step past the Set Point 2 prompt [`SP2] and the Idle Set Point prompt [IdSP] to the Operation menus, the Series 988 displays the menu selection ( [`SYS] , [PidA] or [PidB] ) in the upper display and [OPEr] in the lower display. The Up-arrow &g[...]

5.4 WATLOW Series 988 User’s Manual Operation Menus, Chapter 5 Operation-System Event Input 1 Status Indicates whether the event input 1 circuit is open or closed (read only). [Ei1S] This prompt appears only if [`Ei1] (Global Menu) is set to some- thing other than [``no] . Default ↓ [OpEn] [CLOS] [Ei1S] [Ei1S] Event Input 2 Status Indicates whe[...]

WATLOW Series 988 User’s Manual 5.5 Operation Menus, Chapter 5 Operation-System Alarm 2 High Select the high trigger value for the output 2 alarm. [A2HI] This prompt appears only if [`AL2] (Output Menu) is set to some- thing other than [``no] . If Default ↓ ↓ highest [`Pr1] or [`pr2] [A2LO] … value of … value of [`AL2] [`AL2] [A2HI] [`rH1[...]

5.6 WATLOW Series 988 User’s Manual Operation Menus, Chapter 5 Operation-System Alarm 3 High Select the high trigger value for the output 3 alarm. [A3HI] This prompt appears only if [`AL3] (Output Menu) is set to some- thing other than [``no] . If Default ↓ ↓ highest [`Pr1] or [`pr2] [A3LO] … value of … value of [`AL3] [`AL3] [A3HI] [`rH1[...]

WATLOW Series 988 User’s Manual 5.7 Operation Menus, Chapter 5 Operation-System Alarm 4 High Select the high trigger value for the output 4 alarm. [A4HI] This prompt appears only if [`AL4] (Output Menu) is set to some- thing other than [``no] . If Default ↓ ↓ highest [`Pr1] or [`pr2] [A4LO] … value of … value of [`AL4] [`AL4] [A4HI] [`rH1[...]

5.8 WATLOW Series 988 User’s Manual Operation Menus, Chapter 5 Local-remote Select a local or remote set point. With [```r] selected the controller displays the remote set point rather than the internal (local) set point, and the set point cannot be changed with the Up-arrow or Down-arrow key. [`L-r] This prompt appears only if [`rSP] (Input Menu[...]

MODE *Cycle Time, Output 1B *Rate, Output 1B *Derivative, Output 1B *Operation Prompt *Proportional Band, Output 1B *Reset, Output 1B *Integral, Output 1B Enter your settings, from the controller's upper display. MODE MODE MODE MODE MODE MODE MODE MODE MODE MODE MODE MODE Output 2 (p. 5.13) Output 1 (p. 5.10) *Cycle Time, Output 2B *Rate, Outp[...]

5.10 WATLOW Series 988 User’s Manual Operation Menus, Chapter 5 Operation-PID A or B PID A or PID B Prompts After you step past the Set Point 2 prompt [`SP2] and the Idle Set Point prompt [IdSP] to the Operation menus, the Series 988 displays the menu selection ( [`SYS] , [PidA] or [Pidb] ) in the upper display and [OPEr] in the lower display. Th[...]

WATLOW Series 988 User’s Manual 5.11 Operation Menus, Chapter 5 Operation-PID A or B Reset, Output 1A or 1B Tune reset to eliminate the offset or droop between the set point and the actual process temperature for PID output 1. When set to [```0] reset is disabled. [rE1A] This prompt appears only if [`dFL] (Calibration Menu) is set to [``US] and [[...]

5.12 WATLOW Series 988 User’s Manual Operation Menus, Chapter 5 Operation-PID A or B Rate, Output 1A or 1B Adjust the rate to eliminate overshoot on startup or after the set point changes. The rate setting will not influence the percent power if the process temperature is more than twice the proportional band from the set point. When set to [```0[...]

WATLOW Series 988 User’s Manual 5.13 Operation Menus, Chapter 5 Operation-PID A or B Cycle T ime, Output 1A or 1B Select the time, in seconds, of a complete on/off cycle. [Ct1A] This prompt appears only if [`In1] (Input Menu) is not set to a process, [CntL] (Global Menu) is not set to [CSCd] and [Pb1A] is set high- er than [```0] . If Default ↓[...]

5.14 WATLOW Series 988 User’s Manual Operation Menus, Chapter 5 Operation-PID A or B Reset, Output 2A or 2B Tune reset to eliminate the offset or droop between the set point and the actual process temperature for PID A output 2. When set to [```0] reset is disabled. [rE2A] This prompt appears only if [`dFL] (Calibration Menu) is set to [``US] and[...]

WATLOW Series 988 User’s Manual 5.15 Operation Menus, Chapter 5 Operation-PID A or B Rate, Output 2 Adjust the rate to eliminate overshoot on startup or after the set point changes. The rate setting will not influence the percent power if the process temperature is more than twice the proportional band from the set point. When set to [```0] rate [...]

5.16 WATLOW Series 988 User’s Manual Operation Menus, Chapter 5 Operation-PID A or B Cycle T ime, Output 2A or 2B Select the time, in seconds, of a complete on/off cycle. [Ct2A] This prompt appears only if [CntL] (Global Menu) is not set to [CSCd] and [Pb2A] is set higher than [```0] . If Default ↓ ↓ mechanical [``%0] … [`1)0] … [99(9] re[...]

TL W W A PROCESS L1 L2 L3 L4 DEV % OUT DISPLAY SERIES 988 MODE AUTO MAN WATLOW Series 988 User’s Manual 6.1 Factory Menus, Chapter 6 Navigating the Factory Menus To reach the Factory Menus, begin in the Display Loop and press the Up- arrow > and Down-arrow < keys together and hold for three seconds. The [`SEt] prompt will appear in the lowe[...]

6.2 WATLOW Series 988 User’s Manual Factory Menus, Chapter 6 ? ? ? ? ? ? ? ? ? ?  [`LOC] [`SYS] [PidA] [PidB] [Inpt] [Otpt] [GlbL] [COM] [Diag] [`CAL] MODE Factory Prompt Enter your settings, from the controller’s upper display. MODE MODE MODE MODE MODE MODE MODE MODE MODE MODE Front P[...]

Factory-Panel Lockout WATLOW Series 988 User’s Manual 6.3 Factory Menus, Chapter 6 Panel Lockout Prompts When you are in the Factory menus, the Series 988 displays the menu selection ( [PLOC] , [diAg] or [`CAL] ) in the upper display and [FctY] in the lower display. The Up-arrow > or Down-arrow key < selects another menu. Press the Mode key[...]

6.4 WATLOW Series 988 User’s Manual Factory Menus, Chapter 6 Factory-Panel Lockout System Menu Select the lockout level for the System Menu. Set the System Menu lockout to no lockout [none] , read only [read] or full lockout [FULL] . [`LOC] This prompt always appears. Default ↓ [none] [read] [FULL] [`SYS] [`SYS] [`SYS] PID A Menu Select the loc[...]

WATLOW Series 988 User’s Manual 6.5 Factory Menus, Chapter 6 Factory-Panel Lockout Input Menu Select the lockout level for the Input Menu. Set the Input Menu lock- out to no lockout [none] , read only [read] or full lockout [FULL] . [InPt] This prompt always appears. Default ↓ [none] [read] [FULL] [Inpt] [InPt] [Inpt] Output Menu Select the loc[...]

6.6 WATLOW Series 988 User’s Manual Factory Menus, Chapter 6 Factory-Panel Lockout Communications Menu Select the lockout level for the Communications Menu. Set the Communications Menu lockout to no lockout [none] , read only [read] or full lockout [FULL] . [COM] This prompt appears only on controllers equipped with Communications hardware (98_ _[...]

WATLOW Series 988 User’s Manual 6.7 Factory Menus, Chapter 6 Factory-Diagnostics Reaching the Diagnostics Menu ❷ Use the Up-arrow > key to step from the Panel Lockout Menu [PLOC] to the Diagnostics Menu [diag] . ❶ Press the Up-arrow > and Down-arrow < keys together and hold until the [`SEt] prompt appears in the lower dis- play. Pres[...]

6.8 WATLOW Series 988 User’s Manual Factory Menus, Chapter 6 Factory Ship Date Shows the date that the final factory control test was performed. The first two digits represent the week as numbered from [01--] to [52--] . The second two digits represent the year [--94] , [--95] , etc… [dAtE] This prompt always appears. Software Revision Shows th[...]

WATLOW Series 988 User’s Manual 6.9 Factory Menus, Chapter 6 Factory-Diagnostics [acnt] [`gnd] [cnt1] [cnt2] Factory Use Only These prompts are used only at the factory. [Acnt] [`gnd] [cnt1] [cnt2] These prompts always appear. Inputs 1 and 2 Module T ypes Displays which input module is installed in the controller. Please doc- ument this value bef[...]

6.10 WATLOW Series 988 User’s Manual Factory Menus, Chapter 6 Factory-Diagnostics Outputs 1, 2, 3 and 4 Module T ypes Display the controller’s output module. Please document this value before contacting the factory for technical assistance. Output Types • [none] no output module (A) • [SSr1] 0.5A solid-state relay (K) • [SS1S] 0.5A solid-[...]

WATLOW Series 988 User’s Manual 6.11 Factory Menus, Chapter 6 Factory-Diagnostics T est Displays Runs a brief test of the controller’s displays and LEDs. To run the test, scroll through the Diagnostics Menu until [disp] is shown in the lower display. Use the Up-arrow key > or Down-arrow key < to select [`YES] from the upper display and pr[...]

6.12 WATLOW Series 988 User’s Manual Factory Menus, Chapter 6 Factory-Diagnostic Open Loop Checks the control loop, consisting of the controller output, power control, heater and sensor. With open loop enabled, the controller moni - tors the output power level and checks for a change in the process input value. If the output power is at maximum f[...]

WATLOW Series 988 User’s Manual 6.13 Factory Menus, Chapter 6 Reaching the Calibration Menu ❷ Use the Up-arrow key > or Down- arrow key < to step through the Factory Menu to the Calibration Menu [`CAL] . ❶ Begin in the Display Loop, and press the Up-arrow > and Down- arrow < key simultaneously for six seconds until the Setup Menu [...]

Factory Menus, Chapter 6 6.14 WATLOW Series 988 User’s Manual Restore Restores the original factory calibration values when set to [ [ ` ` Y Y E E S S ] ] . This is a simple way to recover from a mistake made while calibrating the controller. [`rSt] This prompt always appears. Default ↓ [``no] [`yes] [`rSt] [`rSt] Default Set the operating para[...]

WATLOW Series 988 User’s Manual 7.1 Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 Auto-tuning (Heat and/or Cool) The Series 988 can automatically tune the PID parameters to fit the char- acteristics of your particular thermal system. Standard software units (98_ A -_ _ _ _-_ _ _ _) have 1 set of PID parame- ters. Units with enhanced[...]

7.2 WATLOW Series 988 User’s Manual Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 T uning When the control finishes “learning” the system, it resumes standard PID control using the PID values established by the auto-tuning process. Changing the set point during an auto-tune restarts the auto-tune proce- dure. During auto-tuning [...]

WATLOW Series 988 User’s Manual 7.3 Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 T uning 1. Apply power to the Series 988 and enter a set point. Begin with [``Pb] set to [```1] ; [``rE] or [``It] set to [`0)0] ; [``rA] or [``dE] set to [`0)0] ; [``Ct] set to [``%0] ; [`CAL] set to [```0] ; and [`AUt] set to [`OFF] . 2. Proportional[...]

7.4 WATLOW Series 988 User’s Manual Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 Auto/Man Manual and Automatic Operation To change from auto to manual operation, press the Auto/Man key å twice. Manual operation provides open-loop control of the outputs from a range of -100% to 100% output. The Series 988 allows a negative output v[...]

WATLOW Series 988 User’s Manual 7.5 Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 Alarms 3. Return the controller chassis to the case. Be sure you have it oriented correctly. Press firmly, but gently, to seat the chassis. If you select Form A, the contact is open when power is removed from the control. If you select Form B, the cont[...]

7.6 WATLOW Series 988 User’s Manual Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 Alarms ˜ NOTE: An alarm display will be masked by an error condition or when the control is in the Calibration or Setup menus. Using Alarms Output 2, 3, and 4 of the Series 988 can function as alarms. This is accomplished with the [`Ot2] , [`Ot3] or [[...]

WATLOW Series 988 User’s Manual 7.7 Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 Alarms A rate alarm alerts the operator when the process monitored by input 1 is increasing at a rate higher than the alarm high setting ( [A2HI] , [A3HI] or [A4HI] ) or decreasing at a rate lower than the alarm alarm low setting ( [A2LO] , [A3LO] or [[...]

7.8 WATLOW Series 988 User’s Manual Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 Error Codes [E1`2] [E2`2] : Sensor under-range error The sensor at the input indicated by the first number generated a value lower than that allowed for the range of the sensor, or the analog-to-digital (A/D) converter malfunctioned. Make sure the sett[...]

WATLOW Series 988 User’s Manual 7.9 Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 Error Codes [`Er3] : Ambient temperature error The ambient temperature of the Series 988 has dropped below 32°F/0°C or risen above 149°F/65°C. Calibration errors can also cause this error code. Try setting [`rSt] (Calibration Menu) to [`yES] . (Rea[...]

7.10 WATLOW Series 988 User’s Manual Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 Error Codes To clear an error code… • If [`Err] is set to [`nLA] , the error code should clear once the prob- lem is corrected. • If [`Err] is set to [`LAt] , correct the problem and cycle power. You can also clear the error by pressing both the[...]

WATLOW Series 988 User’s Manual 8.1 General Software Features, Chapter 8 Chapter 8 General Software Burst Fire 8.2 Communications 8.4 Dead Band 8.6 Digital Events 8.8 Heater Current 8.10 Input Filter 8.12 Input Linearization 8.14 Ramp to Set Point 8.16 Remote Set Point 8.18 Retransmit 8.20 Slidewire Feedback 8.22[...]

8.2 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Burst Fire Requirements • This feature only works with zero-cross, solid-state devices. It will not function correctly with random-fire devices. • To enable burst fire the Series 988 must have an open collector or solid- state relay output: controllers w[...]

WATLOW Series 988 User’s Manual 8.3 General Software Features, Chapter 8 General Software TL W W A PROCESS L1 L2 L3 L4 DEV % OUT DISPLAY MODE AUTO MAN SERIES 988 input 1 out put 1 QPAC w it h QC D input lim it S e mi c o n d u c t o r O v e n t em perat ure s ens or lim it s ens or heat ed plat en 50% output 1 on, 1 off 10% output 1 on, 9 off 100[...]

8.4 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Communications Requirements Choose which interface your application will use: EIA/TIA-232 serial com- munications (98_ _-_ _ _ _-_R_ _), EIA/TIA-485 or EIA/TIA 232 serial com- munications (98_ _-_ _ _ _-_U_ _), or EIA/TIA-485 or EIA/TIA-422 serial communicat[...]

WATLOW Series 988 User’s Manual 8.5 General Software Features, Chapter 8 General Software TL TL W W W W A A PROCESS L1 L2 L3 L4 DEV % OUT DISPLAY MODE AUTO MAN SERIES 988 TL TL W W W W A A PROCESS L1 L2 L3 L4 DEV % OUT DISPLAY MODE AUTO MAN SERIES 988 TL TL W W W W A A PROCESS L1 L2 L3 L4 DEV % OUT DISPLAY MODE AUTO MAN SERIES 988 TL TL W W W W A[...]

8.6 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Dead Band Requirements The dead band feature is standard on any Series 988 controller with two control outputs. The dead band prompts will appear if the control outputs are configured for heat/cool or cool/heat. Overview The dead band prompts, [db`A] and [db[...]

WATLOW Series 988 User’s Manual 8.7 General Software Features, Chapter 8 General Software TL TL W W W W A A PROCESS L1 L2 L3 L4 DEV % OUT DISPLAY MODE AUTO MAN SERIES 988 input 1 out put 1 out put 2 E n v i r o n me n t a l C h a mb e r lim it heat er t em perat ure s ens or c hiller lim it s ens or Sample Application An engineer for an environme[...]

8.8 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Digital Events Requirements A single digital event input is standard on all controls. A second digital input is available as an option for input 2 (98_ _-_5_ _-_ _ _ _). Overview The digital event input options on the Series 988 controller allow the oper- at[...]

WATLOW Series 988 User’s Manual 8.9 General Software Features, Chapter 8 General Software TL TL W W W W A A PROCESS L1 L2 L3 L4 DEV % OUT DISPLAY MODE AUTO MAN SERIES 988 input 1 input 3 (ev ent input 1) out put 1 lim it lim it s ens or heat er t em perat ure s ens or s w it c h Sample Application A manufacturing engineer is building an applicati[...]

8.10 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Heater Current Requirements Choose the heater current option (98_ _-_4_ _-_ _ _ _) for input 2 and an appropriate current transformer. A current transformer must be ordered separately. Output 1 cannot be used as a process output. The heater current feature [...]

WATLOW Series 988 User’s Manual 8.11 General Software Features, Chapter 8 General Software Sample Application The Series 988 controls the lower platen of a compression molding press that contains five, 10-ampere heaters. A 50A:50mA current transformer is used to monitor heater current. Set the Input 2 prompt [`In2] to current [Curr] , the Range L[...]

8.12 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Input Filter Requirements This feature is standard on all Series 988 controllers. Overview In certain applications the process being measured can be unstable, which makes it difficult to control and also makes the constantly changing display difficult to re[...]

WATLOW Series 988 User’s Manual 8.13 General Software Features, Chapter 8 General Software Sample Application A Series 988 controls the humidity in an environmental chamber. The rel- ative humidity (RH) sensor provides a 4-20mA signal over a 0-100% RH range. The sensor is very sensitive to changes caused by air flow in the chamber. The turbulence[...]

8.14 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Input Linearization Requirements The square root extraction feature is standard on any Series 988 con- troller with universal signal conditioner inputs. The linearization prompt will appear if a process input is selected with the DIP switches (see Chapter 1[...]

WATLOW Series 988 User’s Manual 8.15 General Software Features, Chapter 8 General Software Sample Application A waste water process engineer needs to control the flow of a solution to be mixed with wastewater to treat it. The transmitter provides a 4-20mA output without square root extraction. The engineer used the Series 988 with a universal sig[...]

8.16 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Ramp T o Set Point Requirements This feature is standard on all units. Overview Ramp to set point enables the Series 988 to ramp the set point at a user- defined rate. This allows the controller to start up a system or change between set points at a rate th[...]

WATLOW Series 988 User’s Manual 8.17 General Software Features, Chapter 8 General Software Sample Application An engineer needs to control the temperature of a muffle furnace. The fur- nace set point must be ramped up at a defined rate to prevent stressing the muffle and other system components. By enabling the ramp to set point function in the S[...]

8.18 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Remote Set Point Requirements Input 2 must be either a thermocouple (98_ _-_1_ _-_ _ _ _ ) or universal signal conditioner (98_ _-_2_ _-_ _ _ _). To use a Series 988 as a master controller, choose one of the retransmit options for output 3 of the master (98[...]

WATLOW Series 988 User’s Manual 8.19 General Software Features, Chapter 8 General Software Sample Application An engineer has a machine with eight independent zones of heat. He wants to change set points on all zones without having to adjust each con- trol individually. This can be achieved using a Series 988 with a 0-5V Î (dc) retransmit output[...]

8.20 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Retransmit Requirements Output 3 is used for the retransmit option. Choose either a milliamp (98_ _-_ _ _ _-M_ _ _) or a voltage (98_ _-_ _ _ _-N_ _ _) signal. Select the output range in the Output Menu. Overview The retransmit feature can be used to transm[...]

WATLOW Series 988 User’s Manual 8.21 General Software Features, Chapter 8 General Software Sample Applications A Series 988 is being used to control the temperature of a heat-treat oven. The temperature of the process must be recorded on a chart recorder. The oven temperature range stays between 600° and 900° F. The chart recorder requires a 4-[...]

8.22 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Slidewire Feedback Requirements A slidewire configuration uses at least two inputs and two control out- puts. Input 2 can only be selected as a slidewire input (98_ _-_3_ _-_ _ _ _). Overview The Series 988 can control the position of a valve with a slidewi[...]

WATLOW Series 988 User’s Manual 8.23 General Software Features, Chapter 8 TL TL W W W W A A PROCESS L1 L2 L3 L4 DEV % OUT DISPLAY MODE AUTO MAN SERIES 988 input 1 input 2 slidewire input output 1 (close) output 2 (open) gas flow gas valve cut-off valve Valve Actuator limit Gas-fired Furnace limit sensor temperature sensor Sample Application A Ser[...]

WATLOW Series 988 User’s Manual 9.1 Enhanced Software Features, Chapter 9 Chapter 9 Enhanced Software Cascade 9.2 Dif ferential 9.6 Dual PID 9.8 Duplex 9.10 Ratio 9.12[...]

9.2 WATLOW Series 988 User’s Manual Enhanced Software Features, Chapter 9 Enhanced Software Cascade Requirements Cascade control requires enhanced software and two analog inputs, input 1 to monitor the primary, or outer, loop and input 2 to monitor the sec- ondary, or inner, loop. At least one control output is required to control the process. Ov[...]

WATLOW Series 988 User’s Manual 9.3 Enhanced Software Features, Chapter 9 Enhanced Software ence between the set point and the process temperature generates an internal percent output value for the second, or inner loop, controller. This value cannot be seen by the operator. This internal percent (% int) output generates the internal set point fo[...]

9.4 WATLOW Series 988 User’s Manual Enhanced Software Features, Chapter 9 Enhanced Software The outer loop can be auto-tuned by setting [`AUt] to [PidA] . While auto- tuning, the outer loop will be controlled in an on/off mode at a set point equal to [AtSP] x [`SP1] . In a heating application, make sure the set point is set at a value above ambie[...]

WATLOW Series 988 User’s Manual 9.5 Enhanced Software Features, Chapter 9 Enhanced Software Sample Application A Series 988 controller is used to heat lube oil to 125°F with a screw-plug- style heater. To protect the oil from breaking down and maximize its life, it is desirable to limit the maximum heater sheath temperature to 250° F. The Serie[...]

9.6 WATLOW Series 988 User’s Manual Enhanced Software Features, Chapter 9 Enhanced Software Dif ferential Requirements Two inputs and the enhanced software option are required. Overview Differential control allows the Series 988 to control one process at a differ- ence to another process. Input 2 acts as a remote set point input. However the disp[...]

WATLOW Series 988 User’s Manual 9.7 Enhanced Software Features, Chapter 9 Enhanced Software TL TL W W W W A A PROCESS L1 L2 L3 L4 DEV % OUT DISPLAY MODE AUTO MAN SERIES 988 out s ide t em perat ure s ens or input 1 input 2 out put 1 lim it W a t e r B o i l e r lim it s ens or heat ing elem ent t em perat ure s ens or Sample Application The most [...]

9.8 WATLOW Series 988 User’s Manual Enhanced Software Features, Chapter 9 Enhanced Software Dual PID Sets Requirements The Series 988 controller needs the enhanced software option to use dual PID sets. Overview Standard software units have a single set of PID parameters. Units with enhanced software can use two independent sets of heat/cool PID p[...]

WATLOW Series 988 User’s Manual 9.9 Enhanced Software Features, Chapter 9 Enhanced Software TL TL W W W W A A PROCESS L1 L2 L3 L4 DEV % OUT DISPLAY MODE AUTO MAN SERIES 988 input 1 input 2 out put 1 out put 2 c hiller lim it s ens or heat er T e s t C h a mb e r t em perat ure s ens or pres s ure s w it c h lim it Sample Application A test engine[...]

9.10 WATLOW Series 988 User’s Manual Enhanced Software Features, Chapter 9 Enhanced Software Duplex Requirements The duplex control feature requires enhanced software and a process out- put. Overview Certain systems require that a single process output control both heating and cooling outputs. A Series 988 controller configured with enhanced soft[...]

WATLOW Series 988 User’s Manual 9.11 Enhanced Software Features, Chapter 9 Enhanced Software Sample Application The system outlined above uses a three-way valve for heating and cooling a fluid sample. Coils surround the container holding the fluid. When the temperature needs to be raised, the signal to the valve will be between 12 and 20mA, sendi[...]

9.12 WATLOW Series 988 User’s Manual Enhanced Software Features, Chapter 9 Enhanced Software Ratio Requirements Ratio control requires enhanced software. Two analog inputs are required to monitor the process, and at least one output adjusts the controlled part of the process. Overview This feature allows the Series 988 to control one process as a[...]

WATLOW Series 988 User’s Manual 9.13 Enhanced Software Features, Chapter 9 Enhanced Software Sample Application Blue pigment must be added to paint at a ratio of one part per 100 to cre- ate a mixed paint of the desired color. The uncolored paint flows into the mixer in an uncontrolled stream that is set manually and sensed by input 2. A motorize[...]

WATLOW Series 988 User’s Manual A.1 Appendix Appendix Glossary A.2 Specifications A.4 W arranty and Returns A.5 Index A.6 Menu Overview A.10 Model Number A.1 1 Declaration of Conformity A.12[...]

A.2 WATLOW Series 988 User’s Manual Appendix Glossary , A - L annunciator — A visual display that uses pilot lights to indicate the former or existing condition of several items in a system. bumpless transfer — A smooth transition from auto (closed loop) to manual (open loop) operation. The control output(s) does not change during the transfe[...]

WATLOW Series 988 User’s Manual A.3 Appendix Glossary , M - Z linearization, square root — The extraction of a linear signal from a nonlinear signal corresponding to the mea- sured flow from a flow transmitter. Also called square root extraction. Modbus (RTU) — Remote Terminal Unit. NEMA 4X — A NEMA specification for determining resis- tanc[...]

A.4 WATLOW Series 988 User’s Manual Appendix Specifications Control Mode • Dual input, quad output, optional retransmit of set point or process variable. • Programmable direct and reverse acting control out- puts. • One-step auto-tuning. Operator Interface • Local/remote set point capability. • Dual, 4-digit LED displays: upper, 0.4” [...]

WATLOW Series 988 User’s Manual A.5 Appendix W arranty/Returns W arranty The Watlow Series 988 is warranted to be free of defects in material and workmanship for 36 months after delivery to the first purchaser for use, providing that the units have not been misapplied. Since Watlow has no control over their use, and some- times misuse, we cannot [...]

A.6 WATLOW Series 988 User’s Manual Appendix Index a-h %OUT LED 3.1 0-5V Î (dc) process wiring input 1 2.8 input 2 2.9 output 1 2.12 output 2 2.13 0-10V Î (dc) process wiring input 1 2.8 input 2 2.9 output 1 2.12 output 2 2.13 0-20mA process wiring input 1 2.8 input 2 2.9 output 1 2.12 output 2 2.13 0-50mV (high impedance) wiring input 1 2.8 in[...]

WATLOW Series 988 User’s Manual A.7 Appendix Index h-r hysteresis A.2 hysteresis 1 4.20 hysteresis 2 4.22 hysteresis 3 4.26 hysteresis 4 4.29 I idle set point 5.3 , 8.8 inner loop, cascade 9.2 - 9.3 input 1 4.3 - 4.8 input 1 wiring 2.8 0-5V Î (dc) process 2.8 0-10V Î (dc) process 2.8 0-20mA process 2.8 0-50mV (high impedance) 2.8 1-5V Î (dc) p[...]

A.8 WATLOW Series 988 User’s Manual Appendix rate/derivative adjustment 7.3 ratio control 9.12 - 9.13 , A.3 reference junction A.2 relay, mechanical 7.2 release tabs 1.1 , 2.2 - 2.3 , 7.5 remote set point 4.10 , 8.8 , 8.18 - 8.19 removing controller chassis 1.1 , 2.2 - 2.3 , 7.5 reset output 1 5.11 output 2 5.14 reset/integral adjustment 7.3 rest[...]

WATLOW Series 988 User’s Manual A.9 Appendix [dEC2] (decimal 2) 4.11 [`dFL] (default) 6.14 [diAg] (Diagnostics Menu) 6.7 [diAg] (diagnostics lockout) 6.6 [diFF] (differential) 4.36 , 9.7 [`dir] (direct action) 4.37 [dISP] (test displays) 6.11 [dUPL] (duplex) 4.38 E [E1`1] (A/D underflow error) 7.8 [E2`1] (A/D underflow error) 7.8 [E1`2] (sensor u[...]

SP2 IdSP Set point 2 Idle set point ( ) ( ) Operation OPEr ( ) Setup SEt ( ) Fcty Factory ( ) A.10 WATLOW Series 988 User’s Manual Appendix (SyS) Alarm 2 low Event input 2 status Alarm 2 high Alarm 3 low Alarm 3 high (System) Event input 1 status Ei1S A2LO A2HI A3LO A3HI Ei2S A4LO AUt L-r A4HI ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) Auto-tune Ala[...]

WATLOW Series 988 User’s Manual A.11 Appendix Model Number Ordering Information (1237) To order, complete the code number to the right with the information below: 9 8 _ _ - _ _ _ _ - _ _ _ _ Series 988: a single-channel, temperature/process controller, 1 analog input, 1 digital input, 1 analog or digital input, 4 outputs. Power Supply & Mount[...]

A.12 WATLOW Series 988 User’s Manual Appendix Erwin D. Lowell Winona, Minnesota, USA Name of Authorized Representative Place of Issue General Manager January 9, 1996 T itle of Authorized Representative Date of Issue ________________________________________ Signature of Authorized Representative Declaration of Conformity Series 986, 987, 988, 989 [...]

Watlow Series 988 User’s Manual Watlow Controls, 1241 Bundy Blvd., P.O. Box 5580, Winona, MN 55987-5580, Phone: 507/454-5300, Fax: 507/452-4507[...]