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Section IX - Troubleshooting
Probable Causes:
Corrective Action:
72 Quincy Compressor
®
- QSD™
Unscheduled Shutdown (continued):
CHECK LIFT VALVE, BLOWDOWN VALVE AND MINIMUM PRESSURE
CHECK
VALVE OPERATION.
CONTACT AN AUTHORIZED QUINCY SERVICE TECHNICIAN FOR
REPAIRS
.
CHECK COOLANT SHUT-OFF VALVE AND WATER SUPPLY.
CORRECT THE CAUSE OF THE MOTOR OVERLOADED CONDITION,
RESET THE OVERLOAD RELAY AND PRESS THE RESET BUTTON.
CHECK MOTOR NAMEPLATE AND COMPARE TO OVERLOAD RELAY
SETTING
.
TIGHTEN MOUNTING SCREWS ON THERMAL OVERLOAD.
CHECK ALL WIRING TERMINALS FOR CONTACT AND TIGHTNESS.
CHECK POWER SUPPLY AND TRANSFORMER FUSES.
CHECK THE POWER SUPPLY, POWER SUPPLY CABLES AND RIBBON
CABLE
GOING TO DISPLAY BOARD.
CHECK VOLTAGE AND AMPERAGES WHILE OPERATING AT FULL
LOAD
PRESSURE.
REPLACE RELAY.
CHECK MOTOR STARTER WIRING BEFORE REMOVING MOTOR.
REMOVE MOTOR AND HAVE TESTED AT MOTOR MANUFACTURER
REPAIR
CENTER.
CHECK WIRE CONNECTION BETWEEN RESISTANCE TEMPERATURE
DETECTOR
AND MICROPROCESSOR BOARD. IF RTD
PERFORMANCE IS QUESTIONABLE, CONTACT AN AUTHORIZED
QUINCY SERVICE TECHNICIAN.
CHECK WIRE CONNECTIONS OF PRESSURE SENSORS.
REPLACE SENSORS.
CORRECT THE CAUSE OF THE OVERLOAD CONDITION. RESET THE
OVERLOAD
RELAY AND PRESS ENTER.
CHECK FOR PROPER AIREND ROTATION.
REDUCE “RAMP” TIME ON REMOTE LOW VOLTAGE OR SOLID
STATE
STARTERS.
HIGH PRESSURE DIFFERENTIAL
COOLANT FLOW SWITCH OPEN
THERMAL MOTOR OVERLOAD RELAYS
TRIPPING
INCORRECT THERMAL OVERLOAD RELAY
SETTING
LOOSE OVERLOAD CONNECTION
LOOSE WIRE CONNECTIONS
POWER FAILURE
LOW VOLTAGE
FAULTY CONTROL RELAY
FAULTY MOTOR
FAULTY OR DISCONNECTED RTD
FAULTY OR DISCONNECTED PRESSURE
SENSORS
MOTOR OVERLOAD
REVERSE ROTATION