Quincy Compressor 50093-103 - Manual (Page 62)

56
UNSCHEDULED SHUTDOWN
PROBABLE CAUSE CORRECTION
High air discharge temperature Correct the situation in accordance with the instruction in the
"High Discharge Air Temperature and/or High Fluid Injection
Temperature" section of this troubleshooting guide. Restart
the vacuum pump.
Thermal overload relays tripping Correct the cause of the overloaded condition, reset the
overload relay and press the reset button
Power failure Check the power supply to the unit.
Faulty HAT switch Contact qualified service technician.
Loose wire connections Check all wiring terminals for contact and tightness.
Faulty control relay Replace relay.
THERMAL OVERLOAD RELAYS TRIPPING
PROBABLE CAUSE CORRECTION
Excessive discharge pressure Check exhaust piping for restrictions. Check separator
element for condition.
Low voltage Check voltage and amperages while operating the unit at
full load and full pressure.
Loose overload connection Tighten mounting screws on "Thermal Overload".
Phase Fault Could be caused by low voltage, phase unbalance, or loss
of phase. This may be an intermittent problem and you may
only need to press the "Start" button to resume operation.
But if problem repeats, the power company will need to
check the incoming power.
Incorrect thermal overload relay
setting Check motor name plate and compare to overload relay
setting.
Faulty motor Remove and have tested at motor manufacturer repair
center.