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Section IX - Troubleshooting
Probable Causes:
Corrective Action:
Quincy Compressor
®
- QSD™ 77
Thermal Overload Relays Tripping:
LOOSE SIGNAL WIRE FROM OVERLOAD(S)
INCORRECT THERMAL OVERLOAD RELAY
SETTING
LOOSE MOTOR OR STARTER WIRING
CHECK SIGNAL WIRE CONNECTIONS.
CHECK MOTOR NAMEPLATE AND COMPARE TO OVERLOAD RELAY
SETTING
SPECIFICATIONS.
CHECK ALL CONNECTIONS FOR TIGHTNESS.
CHECK VOLTAGE AND AMPERAGES WHILE OPERATING THE UNIT
AT
FULL LOAD AND FULL PRESSURE. MAXIMUM TOLERANCE
+10%.
CHECK MOTOR STARTER WIRING BEFORE REMOVING MOTOR.
REMOVE MOTOR AND HAVE TESTED AT AUTHORIZED MOTOR
MANUFACTURER
REPAIR CENTER.
REPLACE AIR FILTER ELEMENT.
ADD ADDITIONAL COMPRESSORS AS NEEDED.
LOCATE AND ELIMINATE AIR LEAKS IN SERVICE LINES.
CONTACT AN AUTHORIZED QUINCY SERVICE TECHNICIAN.
CHECK CONTROL SOLENOID AND BLOWDOWN VALVE.
READJUST THE AIR PRESSURE SWITCH SO THAT THE UNLOAD
PRESSURE
DOES NOT EXCEED THE MAXIMUM RECOMMENDED
OPERATING
PRESSURE.
LOW VOLTAGE
FAULTY MOTOR
Low Delivery Pressure:
PLUGGED AIR INTAKE FILTER
EXCESSIVE DEMAND - EXCEEDS SUPPLY
EXCESSIVE LEAKS IN SERVICE LINES
FAULTY LINE PRESSURE TRANSDUCER
High Interstage Pressure:
BLOWDOWN VALVE NOT RELIEVING
PRESSURE
AIR PRESSURE SWITCH NOT SET
CORRECTLY
(OPERATING IN BACK-UP
MODE)