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Section IX - Troubleshooting
Probable Causes:
Corrective Action:
70 Quincy Compressor
®
- QSD™
Failure to Start:
POWER NOT TURNED “ON”
BLOWN CONTROL CIRCUIT FUSE
FAULTY START SWITCH
LOOSE WIRE CONNECTIONS
POWER FAILURE
FAULTY TRANSFORMER
LOW VOLTAGE
SAFETY CIRCUIT SHUTDOWN RESULTING
FROM
HIGH DISCHARGE AIR
TEMPERATURE
FAULTY HIGH AIR TEMPERATURE SWITCH
THERMAL MOTOR OVERLOAD RELAYS
TRIPPING
FAULTY CONTROL RELAY
(WATER-COOLED ONLY)
FAULTY COOLANT SHUT-OFF VALVE
(COOLANT FLOW SWITCH CONTACTS ARE
OPEN
)
SETUP MEMORY FAILURE
SETUP DATA NOT INITIALIZED
TURN THE POWER ON BY CLOSING THE MAIN DISCONNECT
SWITCH
OR CIRCUIT BREAKER.
REPLACE FUSE. FIND AND CORRECT CAUSE.
CHECK FOR SHORTED OUT LIFT VALVE SOLENOID.
CHECK THE SWITCH FOR MALFUNCTION OR LOOSE CONNECTIONS.
CHECK ALL WIRING TERMINALS FOR CONTACT AND TIGHTNESS.
CHECK POWER SUPPLY AND TRANSFORMER FUSES.
CHECK POWER SUPPLY, POWER SUPPLY CABLES AND RIBBON
CABLE
GOING TO DISPLAY BOARD.
CHECK SECONDARY VOLTAGE ON TRANSFORMER.
CHECK THE VOLTAGE AT YOUR ENTRANCE METER. 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.
CORRECT THE SITUATION IN ACCORDANCE WITH THE
INSTRUCTION
IN THE HIGH DISCHARGE AIR TEMPERATURE
SECTION
OF THIS TROUBLESHOOTING GUIDE. RESTART THE
COMPRESSOR
.
CHECK HAT SWITCH. CONTACT AN AUTHORIZED QUINCY
SERVICE
TECHNICIAN FOR REPAIRS.
DETERMINE AND CORRECT THE CAUSE OF THE MOTOR
OVERLOADED
CONDITION. RESET OVERLOAD RELAY.
REPLACE RELAY.
ENSURE ADEQUATE WATER SUPPLY PRESSURE AND FLOW IS
AVAILABLE
AND SUPPLY VALVE IS OPEN. VERIFY THERE IS NOT
EXCESSIVE
BACKPRESSURE ON THE DRAIN SIDE OF THE WATER
SYSTEM
. REPLACE FAULTY WATER FLOW SWITCH.
TURN POWER OFF AND THEN BACK ON.
CHECK POWER CABLE AND CONNECTION BETWEEN DC POWER
SUPPLY
AND MICROPROCESSOR.
CONTACT AN AUTHORIZED QUINCY SERVICE TECHNICIAN TO
CHECK
FOR MICROPROCESSOR FAILURE AND CHECK FOR IMPROPER
VOLTAGE
FROM THE DC POWER SUPPLY.
INITIALIZE SETUP DATA AS DESCRIBED ON PAGE 37 .