Troubleshooting - Quincy QSF Series Instruction Manual

PROBABLE CAUSE
Failure to Start
Power not turned "ON"
Blown control circuit fuse
Safety circuit shutdown resulting
from high discharge air temperature
Thermal overload relays tripping
Low voltage
Power failure
Faulty control relay
Loose wire connections
Faulty transformer
Unscheduled Shutdown
High air discharge temperature
Thermal overload relays tripping
Power failure
Faulty HAT sensors
Loose wire connections
Low Air Delivery
Plugged air intake filter element
Excessive leaks in the service lines
Inlet valve not fully open
Excessive air demand
Excessive leaks in service lines
Inlet valve not fully open
Plugged air intake filter
CORRECTIVE ACTION
Turn the power "ON" by closing the main disconnect switch or circuit
breaker
Replace fuse. Find and correct cause.
Correct the situation in accordance with the instruction in the "High
Discharge Air Temperature " section of this troubleshooting guide.
Restart the compressor.
Correct the cause of the overloaded condition, reset overload relay and
press the start button.
Ask the power company to make a voltage check at your entrance
meter, then compare that reading to a reading taken at the motor
terminals. Use these two readings as a basis for locating the source of
low voltage.
Check power supply.
Replace the relay.
Check all wiring terminals for contact and tightness.
Check secondary voltage on transformer.
Correct the situation in accordance with the instruction in the "High
Discharge Air Temperature " section of this troubleshooting guide.
Restart the compressor.
Correct the cause of the overloaded condition, reset the overload relay
and press the reset button.
Check the power supply.
Contact qualified serviceman.
Check all wiring terminals for contact and tightness.
Clean air filter element or replace with new element.
Check service lines for leaks with soapsuds.
Check for build up or gumming of shaft
Re-evaluate air demand. Add additional compressors as needed.
Check service for leaks using soap suds and repair as needed.
Correct in accordance with the instructions in "Inlet valve not opening
or closing in relation to air demand" section of troubleshooting
guide.
Replace air filter element.
Quincy Compressor – QSF Series
Section VII– Troubleshooting
39