American Dryer Corp. MLG-460 manual

ADC Part No. 113072 MLG-460 Installation/Operator's Manual For replacement parts, contact the distributor from which the dryer was purchased or American Dryer Corporation 88 Currant Road Fall River MA 02720-4781 Telephone: (508) 678-9000 / Fax: (508) 678-9447 E-mail: techsupport@amdry.com 081999DMG/cms WARNING: For your safety the information [...]

Retain This Manual In A Safe Place For Future Reference Replacement parts can be obtained from your distributor or the ADC factory. When ordering replacement parts from the factory, you can FAX your order to ADC at (508) 678-9447 or telephone your orders directly to the ADC Parts Department at (508) 678-9000. Please specify the dryer model number a[...]

IMPORTANT YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and THE GAS SUPPLY BEFORE ANY COVERS or GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING, ADJUSTING, INSTALLATION, or TESTING OF ANY EQUIPMENT per OSHA (Occupational Safety and Health Administration) STANDARDS. CHILDREN SHOULD NOT BE ALLOWED TO PLAY ON OR NEAR THE DRYERS.[...]

WARNING The dryer must never be operated with any of the back guards, outer tops, or service panels removed. PERSONAL INJURY or FIRE COULD RESULT. IMPORTANT PLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment or specified in the installation/operator's manual included with the dryer. Dryers must not be installed or stored in an ar[...]

Table of Contents SECTION I Important Information ......................................................................................................................... 3 A. Receiving and Handling ................................................................................................................. 3 B. Safety Precaution .............[...]

SECTION VII Service and Parts Information .......................................................................................................... 48 A. Service ....................................................................................................................................... 48 B. Parts .......................................[...]

3 SECTION I IMPORTANT INFORMATION A. RECEIVING and HANDLING The dryer is shipped in a protective stretch wrap cover with protective cardboard corners and top cover (or optional box) as a means of preventing damage in transit. Upon delivery, the dryer and packaging, and wooden skid should be visually inspected for shipping damage. If any damage what[...]

4 B. SAFETY PRECAUTIONS WARNING : For your safety, the information in this manual must be followed to minimize the risk of fire or explosion or to prevent property damage, personal injury, or loss of life. WARNING : The dryer must never be operated with any of the back guards, outer tops, or service panels removed. PERSONAL INJURY or FIRE COULD RES[...]

5 7. A program should be established for the inspection and cleaning of lint in the burner area, exhaust duct work, and inside the dryer. The frequency if inspection and cleaning can best be determined from experience at each location. WARNING : The collection of lint in the burner area and exhaust duct work can create a potential fire hazard. 8. F[...]

6 SECTION II SPECIFICATIONS A. SPECIFICATIONS * Gas pressure into the dryer cannot exceed 13” water column (W.C.) - 32.34 mb. If the gas pressure is higher than 13” W.C. (32.34 mb), an external regular must be installed. NOTE : ADC reserves the right to make changes in specifications at any time, without notice or obligation. Maximum Capacity ([...]

7 Specifications NOTE : ADC reserves the right to make changes in specifications at any time, without notice or obligation.[...]

8 SECTION III INSTALLATION PROCEDURES Installation should be performed by competent technicians in accordance with local and state codes. In the absence of these codes, the installation must conform to applicable AMERICAN NATIONAL STANDARDS: National Fuel Gas Code ANSI.Z223.1-LATEST EDITION or National Electric Code ANSI/NFPA NO. 70- LATEST EDITION[...]

9 2. Reassembly Instructions For Dryers Shipped In Three (3) Pieces When the dryer is shipped in three pieces, the tumbler and the tumbler base sections are shipped as two (2) separate pieces. The heat console section is shipped as the third piece. a. Reassemble The Tumbler (Basket) Base Section To The Heat Console Section Move the heat console sec[...]

10 c. Reassemble The Tumbler (Basket) Section To The Tumbler (Basket) Base Lift the tumbler (basket) section with a cable through the eye bolts on top of the section. Slowly lower the tumbler (basket) section over the tumbler base. The four (4) large slots located on the bottom of the tumbler (basket) section (one slot at each corner of the tumbler[...]

11 B. LOCATION REQUIREMENTS The dryer requires 36-inches (91.44 cm) of space on each side of the dryer and 36-inches (91.44 cm) of space behind the unit for ease of maintenance and tilting. The dryer must be leveled for proper operation. If shimming is required, put 9-1/2” x 9-1/2” (24.13 cm x 24.13 cm) metal shims under the base feet. The drye[...]

12 b. Rear Tilt Piston Lines This connection is made at the rear of the dryer in the space between the lower heat console section and the tumbler (basket) base section. Insert the 3/8” poly-flo tube coming from the tumbler (basket) base section to the 3/8” brass fitting marked with the corresponding number. Do the same to the second tube and br[...]

13 c. Load Door Piston Lines The load door cylinder pneumatic connections are made in the lower heat console section, in the area behind the pneumatic panel. To connect the 1/4” poly-flo tubing into the corresponding needle valves, match the number on the line with the number on the needle valve. Insert ALL of the tubing (two [2] on a 1-Door mode[...]

14 2. Electric a. Burner Switch and Air Switch These connections are made between the upper heat module and the lower heat module section. To connect the burner, there are three (3) wires that come from the ignition transformer through (2) holes on the bottom of the upper heat module. The green and red wires are fed through the hole closest to the [...]

15 c. Tumbler (Basket) Motors The disconnects for the two (2) tumbler (basket) motors are located in the lower heat console. The right drum (tumbler/basket) motor disconnect is located in the lower heat console on the upper shelf towards the left. The left drum (tumbler/basket) motor disconnect is located in the base of the lower heat console to th[...]

16 e. Annunciator, Pendent, Over-Burner, and RTD (Resistive Temperature Device) Cable Remove the four (4) bolts that hold on the character (460) panel. Open the door to the main electrical enclosure, the female end of the RTD (Resistance Temperature Device) cable will be found there. Loosen the 1-inch lock nut and remove the modified hole seal. Put[...]

17 d. Pendent On the top of the heat console section of the dryer near the pendent, there is a junction box with four (4) cables coming out of it. Two (2) of the cables from the junction box have connectors on the end, a 5-pin connector and an 11-pin connector. Coming out of the pendent should be two (2) cables, one with a 5- pin connector and the [...]

18 f. Left Drum Motor There are two (2) different ways that the left drum motor is connected with or without the motor disconnect junction box. The junction box is used when the connections to the left motor are made on the back side of the motor, nearest to the tumbler (basket). When connecting the motor, bring the left drum motor cable (refer to [...]

19 D. EXTERNAL SUPPLY CONNECTIONS 1. Optional Sprinkler Water Supply A 40 PSI (276 kPa) supply of water must be connected into the 1” (2.54 cm) N.P.T. sprinkler connection located on the left side of the tumbler (basket) base on dryer models with a sprinkler system. 2. Compressed Air Supply A minimum of 20 cubic feet per hour (cfh) .566 cm/hr at [...]

20 3. Gas Piping The gas connection to the dryer is made into the 2-1/2” (5.08 cm) F.P.T. shut-off valve located in the bottom front corner of the lower heat console. The gas pressure supplied to the dryer must be between 7-inches (17.41 m bar) and 13-inches water column (W.C.) (32.34 mbar) for natural gas or between 10.5-inches water column (W.C[...]

21 IMPORTANT : DO NOT use screen or caps on the outside opening of the exhaust duct work. Screens will clog with lint and caps will restrict the exhaust airflow. The duct work must be smooth on the inside with no projections from sheet metal screws or other obstructions which would collect lint. Inspection doors must be installed at strategic point[...]

22 E. ELECTRICAL REQUIREMENTS 1. Electrical Requirements It is your responsibility to have ALL electrical connections made by a properly licensed and competent electrician to assure that the electrical installation is adequate and conforms with local and state regulations or codes. In the absence of such codes, ALL electric connections, materials a[...]

23 2. Electrical Service Specifications IMPORTANT : The dryer must be connected to the electric supply shown on the data label that is affixed to the right side of the main electrical enclosure. In the case of 208 VAC or 240 VAC, the supply voltage must match the electric service specifications of the data label exactly . WARNING : 208 VAC and 240 [...]

24 3. Electrical Service The electrical power is connected the dryer at the high voltage section of the control cabinet. On the MLG-460 dryer, this section is located at the bottom left of the main electrical enclosure. The MLG-460 dryer must be supplied with two (2) independent input power lines. One is 3-phase ( 3ø) electric service that feeds t[...]

25 F. FRESH AIR SUPPLY REQUIREMENTS When the dryer is operating, it draws in room air, heats this air through the tumbler (basket), and exhausts it out of the building. Therefore, the room air must be continually replenished from the outdoors. If makeup air is inadequate, drying time and efficiency will be adversely affected, and safety will be com[...]

26 SECTION IV PRE START-UP A. PREPARATION FOR OPERATION 1. The supply voltage must match the dryer voltage as stated on the aluminum dryer data label which is located on the inner right wall of the electrical cabinet. 2. A separate fused power supply must be connected into safety sprinkler circuit power connection. 3. Open ALL steam supply lines an[...]

27 SECTION V ROUTINE MAINTENANCE A. CLEANING A program or schedule should be established for periodic inspection, cleaning, and removal of lint from various areas of the dryer, as well as throughout the duct work system. The frequency of this cleaning can best be determined from experience at each location. Maximum operating efficiency is dependent[...]

28 MONTHLY Grease the four (4) tumbler shaft pillow bearings with DC-44 ( Dow Corning ) grease or equivalent . DC-44 is a lithium grease that conforms to NLGI Grade 2 and has a temperature range of 40º F (4.4º C) to 400º F (204.4º C). Empty the compressed air filter bowl and add oil to the compressed air lubricator bowl. Use a petroleum based n[...]

29 SECTION VI COMPONENT SYSTEM DESCRIPTIONS A. TUMBLER (BASKET) SUPPORT and DRIVE SYSTEM IMPORTANT : Always keep the tumbler (basket) section of the dryer in an upright position when moving it. 1. Tumbler (Basket) The tumbler is made of five (5)14-gauge stainless steel perforated panels, five (5) stainless steel lifting ribs, and two (2) outer tumb[...]

30 3. Tumbler and Basket Drive System There are two (2) 5 HP (3.73 kw) tumbler drive motors. Each motor drives one of the 2-inch (5.08 cm) diameter tumbler drive shafts, and the motors spin simultaneously so that all four (4) sets drive wheels work together to spin the tumbler (basket). Each motor is connected to the drive shaft by two (2) “A” [...]

31 1) Front Panel Electrical Connections: a) Front Position Switch Disconnect Plug; The front door position switch disconnect plug is located on the left side of the front doors. Disconnect this plug and feed the cable through the right hand side of the tumbler section. b) Intake Temperature Probe Disconnect Plug; The intake temperature probe disco[...]

32 B. MAIN AIR BLOWER and HEAT RECLAIMER SYSTEM The fan which moves the exhaust air through the dryer is a 22-inch (5.88 cm) diameter, squirrel cage wheel that is driven at 1,100 rpm by a 25 HP (18.65 Kw) motor. This fan moves a maximum of 13,000 cfm (368 cmm) air through the dryer.[...]

33 The dryer is equipped with a pneumatically operated heat reclaimer damper, which when opened, will recirculate approximately fifteen percent (15%) of the dryer’s exhaust air. The heat reclaimer damper is closed until ignition of flame has been established. Then, the damper piston is actuated, opening the dampers recirculating fifteen percent ([...]

34 C. COMPRESSED AIR SYSTEM The compressed air system of the dryer consists of a number of pneumatic pistons located throughout the dryer, an Filter/Regulator assembly, and pneumatic control panel. 1. Air Pistons: The pistons are actuated by solenoid and flow control valves that are under computer control. The pneumatic pistons are used to: • Til[...]

35 3. Pneumatic Control Panel The pneumatic control panel of a two-way tilt dryer has two (2) tilting solenoid valves, one to control the front set of tilting pistons and a second to control the rear set of tilting pistons. A 1-Way Tilt dryer has only one (1) tilting solenoid valve. Each valve has five (5) 1/2-inch F.P.T. ports and two (2) electric[...]

36 4. Internal and External Pilot Air Supply On two-way tilt dryers, a pneumatic safety circuit is incorporated to prevent both front and rear tilting pistons from extending their rods at the same time. When 120 volts is supplied to the “S5” side of the front tilting piston solenoid valve coil, the round internal spool in the core of the soleno[...]

37 D. GAS BURNER and IGNITION SYSTEM The dryer’s gas burner system operates an on/off gas rate sequences to accurately control the tumbler’s (basket’s) drying temperature. Maximum firing rate is 2,800,000 Btu/hr (705,600 kcal/hr). Upon a call from heat, the dryer computer sends a 120 volt signal to the burner controller module (BCM) which ini[...]

38 1. Major Burner Components a. Burner Controller Module (BCM) The BCM (burner controller module) provides effective burner flame safeguard control through adjust able purge and trial-for-ignition timing. The BCM insures that ALL dryer safety switch circuits are closed, delays ignition to allow the combustion chamber to vent, and insures that a he[...]

39 2) L.E.D. (light emitting diode) and Neon Displays of the BCM (Burner Controller Module) a) Operating Interlock - L.E.D. (light emitting diode) is lit when: ALL safety interlock switches are closed applying a 120 VAC signal to terminal #7 of the burner controller module (BCM). b) Operating Interlock - L.E.D. (light emitting diode) is not lit whe[...]

40 h) Burner Fan Air Switch Status Indicator - Neon is not lit; • Air switch is not closed after start-up of burner fan. • Door interlocks are open. • Combustion burner screen is clogged. • A door on the dryer is open. i) Test and Reset Button When this button is pushed in, the burner controller module (BCM) will halt the ignition sequence,[...]

41 a) Burner Fan Air Switch The differential in air pressure is measured by the burner fan air switch, which is located next to the burner fan motor. If the combustion air is inadequate, this switch will prevent ignition. The setting of this switch is adjustable, and it should be set at 12 to 15 millimeters (.4 - .6 inches water column [W.C.]) - .9[...]

42 d) Combustion Air Damper To produce the required combustion airflow, this damper can be adjusted. Remove the screen to get access to the damper. Moving the damper closer to the blower inlet opening will reduce the combustion airflow, and moving it away from the blower inlet opening will increase the airflow. To measure the combustion airflow, at[...]

43 Top Motorized Gas Valve The valve sets the gas rate of 2,800,000 btu/hr (705,600 kcal/hr). To achieve this rate, the pressure must be set for 2.5-inches water column (W.C.) - 6.22 mbar - for natural gas and 1.25 inchs water column (W.C.) - .3.1 mbars - for L.P. (liquid propane) gas. To adjust. loosen the pan head screw located on the front of th[...]

44 If ALL safety switches are closed, the burner controller module (BCM) will start the burner fan motor (BCM terminal #8). The BCM (burner controller module) waits 10-seconds to allow the blower motor to get up to speed, and then checks that the burner fan combustion air switch (BCM terminal #6) circuit is closed. If this circuit is open during th[...]

45 Once the flame probe signal is detected by the burner controller module (BCM), it waits 5-seconds to allow the pilot to stabilize and then opens the main motorized gas valves (BCM terminal #5) in sequence. The lower valve opens first. Upon full opening, its’ internal switch closes, enabling the second motorized valve to open and full flame to [...]

46 E. SAFETY DEVICES The dryer is equipped with numerous safety devices to ensure the dryer operates safely. The chart on the following page ( page 47 ) lists each device with its location, function, computer display message, and result of tripping.[...]

47 S A F E T Y D EV I C E S L O C A T I O N F UNC T I O N C O M P U T E R D I SP L A Y M E S S A G E R E S U L T O F T R I PP I N G Load Door Switch Left side of load door Insures dryer load doors are closed "DOOR OPEN" Dryer will not run Unload Door Switch (2-Door Dryers Only) Right side of unload door Insures dryer unload door are close[...]

48 SECTION VII SERVICE/PARTS INFORMATION A. SERVICE 1. Service must be performed by a qualified trained technician, service agency or gas supplier. If service is required, contact the distributor from whom the ADC equipment was purchased. If the distributor cannot be contacted or is unknown, contact the ADC Service Department for a distributor in y[...]

49 SECTION VIII WARRANTY INFORMATION A. RETURNING WARRANTY CARDS 1. Before any dryer leaves the ADC factory test area, a warranty card ( ADC Part No. 112254) is placed on the back side of the main door glass. These warranty cards are intended to serve the customer where we record the individual installation date and warranty information to better s[...]

50 d. Date of part failure. e. Specify whether the parts being returned is for a replacement, a credit, or a refund. NOTE : If a part is marked for a credit or a refund, the invoice number covering the purchase of the replacement part must be provided. NOTE : Warranty tags (ADC Part No. 450064) are available at "no charge" from ADC upon r[...]

51 SECTION IX TROUBLESHOOTING WARNING: YOU MUST DISCONNECT and LOCKOUT THE ELECTRICAL SUPPLY and THE GAS SUPPLY BEFORE ANY COVERS or GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING, ADJUSTING, INSTALLATION OR TESTING OF ANY EQUIPMENT per OSHA (Occupational Safety and Health Administration) STANDARDS. The information provided will h[...]

52 A. POWER MALFUNCTIONS 1. Main Disconnect Will Not Turn On a. PROBABLE CAUSES; 1a) Sprinkler isolated power source “OFF” or disabled. 2a) OL12 tripped or sprinkler circuit defective. 3a) Sprinkler activated. 4a) Sprinkler will not reset. b. POSSIBLE SOLUTIONS; 1b) Verify “ RED ” “Sprinkler Power” on main panel to be illuminated. • I[...]

53 • If RTD (Resistive Temperature Device) probe is defective, replace the probe. NOTE : If ALL systems check out fine, call the ADC Service Department at (508) 678-9000. 2. No Control Power (“ BLUE ” Light Off) a. PROBABLE CAUSES; 1a) Line voltage from main fused disconnected. 2a) Main disconnect on the dryer is turned off. 3a) OL11 (overloa[...]

54 3. Machine Main Power Shuts Down (“ BLUE ” Indicator Off) a. PROBABLE CAUSES; 1a) Sprinkler activated. 2a) OL12 (overload #12) tripped. 3a) “UNDER VOLTAGE FEATURE” of main disconnect has tripped. 4a) Sprinkler circuit defective. b. POSSIBLE SOLUTIONS; 1b) Check if the sprinkler is activated, is “SPRINKLER RESET” button lit? Is the sp[...]

55 The following information will first describe the sprinkler circuit components and then provide a circuit descrip- tion. Please refer to the dryer ladder diagram (which is supplied with the machine) as the following is de- scribed. SPRINKLER CIRCUIT COMPONENTS • OL12 (overload #12) is a 1.6-amp magnetic and thermal overload device set 1-amp. I[...]

56 • L4 (light #4) is an “ amber ” light associated with PB #10 (push button #10), the “SPRINKLER RESET” button. These items are located on the electrical enclosure’s front panel. L4’s function is to give a visual indication that the sprinkler function is asserted and that the pneumatically activated water valve is open. • The air a[...]

57 SUMMARY : With UV (under voltage control of the main disconnect) energized, the dryer main switch may be turn on. • STATE 2 - The tumbler (basket) temperature has risen “ABOVE” SHLC (Sprinkler High Limit Controller) preset trip value. With power is applied to SHLC: • SHLC set point will open • SHLC alarm will close • #2CR (#2 control[...]

58 4. Front Panel “ BLUE ” Light and “ RED ” Light “ON” MLG-460 “ON” button does respond ... a. PROBABLE CAUSES; 1a) EMERGENCY STOP BUTTONS 1, 2, and 3. b. POSSIBLE SOLUTIONS; 1b) Verify that ALL EMERGENCY STOP buttons are pushed in. • EMERGENCY STOP 1 - main enclosed door • EMERGENCY STOP 2 - pendent control • EMERGENCY STOP [...]

59 3a) Malfunctioning operator interface terminal or communications cable. 4a) Malfunctioning 24 volt DC power supply. 5a) Malfunctioning hi-limit temperature controller. b. POSSIBLE SOLUTIONS; 1b) Verify that fuses 7, 8, 9, and 10 are good. Check that ALL fuse holder L.E.D. (light emitting diode) indicators are not lit. • If ALL fuses are good, [...]

60 General Description: The six (6) channels accept independent RTD (Resistive Temperature Device) inputs (spare channels have a 100 ohm [100 Ω ] 5% tolerance resistors installed) and there is an individual set point for each channel. In operation, the scan rate between channels is four (4) to six (6) seconds, and the display will have the temper[...]

61 B. BURNER IGNITION Introduction The heart of the dryer’s burner control section is a burner controller module. It is located on the upper right hand side of the Main Electrical Enclosure panel and is described in detail in Section VI, Part D, Gas Burner and Ignition System on page 37 through page 45 ). As noted below the burner ignition sectio[...]

62 • BURNER DOOR SWITCHES DS4B-DS5B (Interlock 2) These switches are located on the burner doors, and are utilized to verify that they are closed. Their signals are terminated in the Solenoid Junction Box and then fed to the Main Electrical Enclosure. • LOAD DOOR SWITCH DS1B These switches are located on the left center of the load doors, and i[...]

63 • STOP DETECTOR RELAY CONTACT SMD NO This relay contact is used as an interlock to shut down the burner in the event that the tumbler (basket) has stopped for more than 12-seconds during a drying cycle. This contact resides in the Stop Motion Detector Module, located in the left side of the tumbler (basket) section just above the drive system.[...]

64 3. “GAS FAULT” Message (gas system only) NOTE : Refer to MLG-460 Ladder Diagram for reference. PLC (Programmable Logic Controller) MESSAGE - “GAS FAULT” a. PROBABLE CAUSES; 1a) No gas. 2a) PLC (Programmable Logic Controller)out pin #4. 3a) Fuse #15. 4a) Interlock #2 (heater door switches). 5a) Load or unload door switches. 6a) Interlock [...]

65 4b) To check “Interlock 2” (Heater Doors), verify that there is a 110 VAC signal on TB-41, on the Main Electrical Panel, when PLC (Programmable Logic Controller) output #4 is on. NOTE : The heater door interlock switches are double-pole double-throw (DPDT). These switches affect different circuits. • If there is 110 VAC at the panel go to [...]

66 2a) Burner fan air pressure switch. 3a) Pilot gas valve. 4a) Ignition transformer. 5a) Motorized gas valves. 6a) MS4 AUX. 7a) MS8. 8a) Flame detector and burner chassis ground. 9a) Burner controller. b) POSSIBLE SOLUTIONS; 1b) Verify that the burner controller module has power. With control voltage “ON,” verify that the burnt fuse L.E.D. ind[...]

67 • If no voltage is measured; • Start a drying cycle, and monitor the voltages on TB1-23 and 9. • If a voltage is present during drying start-up, the switch is functioning. • If a voltage is not present while the dryer is started, check: • Air Switch Adjustment. • Switch. • Circuitry (dryer Main Wiring Diagram and dryer Solenoid Jun[...]

68 • If arcing does not occur: • Check circuitry; refer to dryer Main Panel Wiring Diagram and dryer Solenoid Junction Box Wiring Diagram. • Check transformer • Check spark igniter in burner • Refer to the ML-460 Service Manual ( ADC Part No. 450023) for more information on the burner controller module and burner start-up. • Retest 5b) [...]

69 • Check that “NONE” of the thermal and magnetic overloads have “TRIPPED.” • Check circuitry; MLG-464 Main Panel Wiring Diagram • Retest 7b) To verify burner fan motor contactor (MS8) operation: Apply a 110 VAC voltage to MS8’s terminals A1 and A2 and verify that the contactor activates. • If MS8 cycles this will indicate that i[...]

70 b) POSSIBLE SOLUTIONS 1b) Visually check that the fan (Blower) rotate in the direction of its arrow. • If rotation is incorrect: • Check rotation of the main fan blower ... If the motor direction is wrong, swap phase 1 and phase 2 of the incoming power in the main electrical enclosure. • Retest 2b) Check the lint chamber air pressure switc[...]

71 b) POSSIBLE SOLUTIONS; 1b) For Air Flow problems refer to SECTION III - Item D (External Supply Connections) - paragraph #4 (Exhaust Air Ducting) on page 20 and page 21 . NOTE : An illuminated “RED” L.E.D. (light emitting diode) indicator on the HI-TEMP CONTROLLER indicates that the Hi-Limit control relays is in “ALARM” and an internal r[...]

72 • If 0 ohms (0 Ω ) is measured; • Check RTD (Resistive Temperature Device) • Check wiring to the RTD (refer to the main panel wiring diagram) • Check wiring to the HI-LIMIT temperature controller (refer to the dryer Main Panel Wiring Diagram). • If RTD (Resistive Temperature Device) measures in the range of 100 ohms (100 Ω ); • C[...]

73 • If the de-energizing time is incorrect: • Adjust the “time adjust” on the stop motion detector module and retest. If the input #0, 10 on the PLC (Programmable Logic Controller) is not on after several rotations of the tumbler (basket): • Check fuse #2 and replace if necessary. • Rotate the tumbler (basket) using the pendant control[...]

74 C. TUMBLER (Basket) SECTION ELECTRICAL MALFUNCTIONS Introduction There are a number of electrical components associated with the tumbler (basket) section. These components are ALL interfaced to the tumbler junction box, and connected to the main electrical enclosure through a disconnectable cable. The “tumbler junction box” is located on the[...]

75 d) Tumbler Junction Box This enclosure interfaces the tumbler’s electrical hardware, to the Main Electrical Panel. The disconnect plug, attached to this enclosure, provides a means of electrical separation of these tumbler (basket) section, for shipping. Refer to ML-460 Tumbler Junction Box Diagram for detailed wiring information. The followin[...]

76 b) POSSIBLE SOLUTIONS; 1a) If the EMERGENCY STOP (E-Stop) - rear - does not respond : • Verify that ALL other EMERGENCY STOP (E-Stop) buttons are pulled out. • Verify that the rear panel’s disconnect plug is indeed connected. The disconnect plug is to allow the removal of the rear panel for drying servicing. 2b) Defective EMERGENCY STOP (E[...]

77 b) POSSIBLE SOLUTIONS; 1b) If either the Drum forward or reverse functions (rear) does not respond : • Verify that the rear panel controls disconnect plug is indeed connected. This disconnect plug allows for the removal of the rear control panel for dryer servicing. 2b) Defective Forward and Reverse Switch • Shut power off at the main breake[...]

78 4. 0 UNLOAD 1 Selection a) PROBABLE CAUSES; 1a) Rear Panel Disconnect Plug. 2a) Defective Switch. 3a) Wiring Back to Main Electrical Enclosure. b) POSSIBLE SOLUTIONS; 1b) If the O UNLOAD 1 Switch does not respond when selected: • Verify that the rear panel controls disconnect plug is indeed connected. This disconnect plug allows for the remova[...]

79 5b) Input 19 L.E.D. (light emitting diode) is not illuminating correctly on the PLC (Programmable Logic Controller) indicates that the signal to the PLC input is missing or the PLC is defective. • Check FUSE 2 on the main electrical panel • Check wiring back to the tumbler junction box • Check wiring back to the rear controls • Check PLC[...]

80 • If yes, wiring is OK: • Check switch placement and door actuation. • If no, check associated: • Switch and wiring • Check wiring back to the tumbler junction box • Check wiring back to the Rear Controls • Check PLC (Programmable Logic Controller) Refer to wiring diagrams: • Tumbler Junction Box Wiring Diagram • Rear Panel Con[...]

81 • The Proximity Sensor is located in the same area as the Tumbler Junction Box • Inductive Proximity Mechanical Adjustment • The target that is attached to the outside of the tumbler (basket). • Stop motion detector module. • Circuit wiring; refer to the Main Panel Wiring Diagram, Tumbler Junction Box Wiring Diagram 2b) If the L.E.D. ([...]

82 D. BASE SECTION ELECTRICAL MALFUNCTIONS Introduction There are four (4) electrical components associated with the dryer’s base section. These components are interfaced to a junction box, and connect to the main electrical enclosure through a disconnect cable. The “Base Junction Box” is located on the right rear of the base section, and tit[...]

83 4. Lint Chamber Pressure Switch - PS3 The “Lint Chamber Pressure Sensing Switch” is located on the left rear side of the dryer’s base. It is an Adjustable pressure switch, which incorporate a single-pole-single-throw (SPST) switch. PS3’s electrical function is to close its switch when the “present pressure” in the lint chamber is suf[...]

84 • If no, check associated: • Switch and Wiring • Check wiring back to the Base Electrical Junction Box • Check PLC (Programmable Logic Controller) • Refer to Wiring Diagrams: • Main Electrical Panel Diagram • Base Electrical Junction Box Wiring Diagram. • Retest; verify that the signal is operational. 3b) Place the dryer in the U[...]

85 6. Lint Screen Mechanism Problem “SCREEN FAULT” A “SCREEN FAULT” message is generated by the incorrect state of the lint screen mechanism sensor switch. The following information will address the correct signal, since it is associated with the Base Electrical Junction Box. a) PROBABLE CAUSES; 1a) The Lint Screen must be cleaned every fiv[...]

86 7. Lint Chamber Air Pressure Problem “AIR FAULT” An “AIR FAULT” message is generated by the LINT CHAMBER PRESSURE switch. The following information will address the signal, since it is associated with the Base Electrical Junction Box. a) PROBABLE CAUSES; 1a) Clogged Lint Screen or Lint Bag 2a) Air Pressure Setting 3a) Air Pressure Switch[...]

87 E. PENDANT CONTROL MALFUNCTIONS Introduction There are four (4) electrical switches associated with the ML-460 Pendant assembly. These components are interfaced to TB1 of Main Electrical Enclosure through two (2) disconnects and two (2) junction boxes. The Pendant Assembly is remote control for Loading or Unloading the dryer. The functions provi[...]

88 • TUMBLER (Basket) FORWARD “PENDANT” - PB1 This push button comprises of one normally open switch, and is mechanically interlocked with the Tumbler (Basket) Reverse Push button. • EMERGENCY STOP ((E-Stop) “PENDANT” - PB6 This push button switch is normally open device and its function is to shut down the control voltage to the dryer [...]

89 • Releases the REVERSE Push-button. • Does PLC (Programmable Logic Controller) input L.E.D. (light emitting diode) #18 go “OFF”? • If the answers to these question are “YES”, wiring to the PLC (Programmable Logic Controller) is correct. If any answer to these questions is “NO”, refer to Probable Causes paragraph below • Tumbl[...]

90 3. EMERGENCY STOP (E-Stop) SWITCH - PB6 If the EMERGENCY STOP (E-Stop) - pendant - does not respond: a) PROBABLE CAUSES; 1a) Another EMERGENCY STOP (E-Stop) Button 2a) A Disconnect Plug 3a) Faulty Switch 4a) Wiring Back To TB1 b) POSSIBLE SOLUTIONS; 1b) Verify that ALL other EMERGENCY STOP (E-Stop) buttons are pushed in, and Retest. 2b) Verify t[...]

91 The following information will provide a means to respond to “Temperature Sensing” malfunctions, and verify ALL its electrical signals. Refer to the following diagrams for detail placement and wiring information. • ML-460 ANNUCIATOR, PENDANT, and UPPER RTD’S (Resistance Temperature Device) WIRING DIAGRAM • ML-460 MAIN PANEL WIRING DIAG[...]

92 • Temperature Measurement and Sensing Problems An “EXHAUST DSFL” MESSAGE is displayed on the operator terminal any time a respective temperature measurement has exceeded the programmed temperature in the PLC (Programmable Logic Controller). A “DSFL” message will stop the current drying cycle and prevent a drying cycle from starting. 2.[...]

93 • If the power supply responds to the disconnection, there is a problem with the driven load and not the power supply itself. • Check ALL loads and retest. Check that the device’s output voltage is 24 volts DC. • If not, adjust it. 3. DEFECTIVE ANALOG INPUT MODULE or CHANNEL Replace Analog Input Module 4. RTD (Resistive Temperature Devic[...]

94 • Motor Protection Device Descriptions The motor protection devices in the dryer incorporate a manual disconnect switch, thermal overload relay, and instantaneous trip mechanism in one compact device. A two (2) position, normally open, auxiliary contact block has been attached to ALL motor protection devices to provide the “MOTOR FAULT” di[...]

95 H. PLC (Programmable Logic Controller) ERROR MESSAGES The diagnostics messages have been provides to aid troubleshooters in diagnosing and repairing dryer problems. The message are intended to direct one to a particular fault area for further testing; not to diagnose the machine for you. NOTE : Not ALL ML-460 dryer symptoms have faults messages.[...]

ADC 113072 1 - 11/04/99-25 2 - 04/03/01-10 3 * 06/19/02-CODE B 4 * 07/29/02-9[...]