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• 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” display message, and shut down “ALL” motors in the event a motor should trip.
1. Motor Actuation Problems
a) PROBABLE CAUSES;
1a) Motor Protection Device “OFF” or “TRIPPED.”
2a) PLC (Programmable Logic Controller) Output Signal Defective
3a) Motor Circuit Wiring
b) PROBABLE SOLUTIONS;
1b) Verify that all motor protection devices (manual starters) have their “START” buttons pushed in. If
any device has tripped, reset it and restart the dryer. If the same devices continue to trip:
• Verify current setting
• Check circuit
• Check motor
• Retest
2b) Verify that the associated output L.E.D. (light emitting diode) on the PLC (Programmable Logic
Controller) is active. Verify that the associated output signal protection fuse is good. Check associated
PLC output circuit wiring to associated motor starter coil (“A” terminals).
3b) Retest
4b) Check associated motor starter circuit wiring to and from motor starters, and to the associated motors
themselves. Refer to the DRYER Main Panel Wiring Diagram; retest.