Hitachi hitachi low current trip function for pumping applications manual

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Table of contents for the manual

  • Page 1

    Application Note: L300P/SJ300 Low Current Trip Function for Pumping Applications Please refer also to the Inverter Instruction Manual AN081804-1[...]

  • Page 2

    L300P/SJ300 Low Current Trip Function for Pumping Applications Sometimes it is desirable to have the inverter trip when running at constant speed and the motor current falls below a certain threshold level. In the case of a pump, this would be indicative of absence of fluid in the pump, and hence no load on the motor. This functionality could also [...]

  • Page 3

    TIMING CHART Time Output Fre q uenc y [FA1] (N . O.) C041 o [OL] (N.C) o [OL] (N.C) n [OL] AND [FA1 ] n [OL] AND [FA1 ] o n Motor Curren t Hitachi America, Ltd. © 2004 Hitachi America, Ltd. Page 3[...]

  • Page 4

    TIMING CHART (continued) p q [FA1] (N . O.) C041 Output Fre q uenc y Motor Curren t p q TRIP [OL] (N.C) q [OL] (N.C) p [OL] AND [FA1 ] p [OL] AND [FA1 ] q Hitachi America, Ltd. © 2004 Hitachi America, Ltd. Page 4[...]

  • Page 5

    WIRING DIAGRAM Outputs Inputs 11A 11C 12A 12C 5 CM1 4 2 1 3 L300P Hitachi America, Ltd. © 2004 Hitachi America, Ltd. Page 5[...]

  • Page 6

    SJ300 Setup Since the intelligent outputs are solid state and share a common connection internally, the SJ300 setup is slightly different. Table 2 shows the SJ300 setup. The wiring diagr am is below. Instead of using a logical AND of the two output signals, we use logical OR, which is achieved by paralleling the outputs as shown. We then invert the[...]