Quincy Compressor QSD 65040-AB, Instruction Manual, Page: 72 / 86

Section IX - Troubleshooting
Probable Causes: Corrective Action:
70
Quincy Compressor ® - QSD™
Failure to Start:
P
OWER NOT TURNED
“ON”
B
LOWN CONTROL CIRCUIT FUSE
F
AULTY START SWITCH
L
OOSE WIRE CONNECTIONS
P
OWER FAILURE
F
AULTY TRANSFORMER
L
OW VOLTAGE
S
AFETY CIRCUIT SHUTDOWN RESULTING
FROM HIGH DISCHARGE AIR
TEMPERATURE
F
AULTY HIGH AIR TEMPERATURE SWITCH
T
HERMAL MOTOR OVERLOAD RELAYS
TRIPPING
F
AULTY CONTROL RELAY
(
WATER
-
COOLED ONLY
)
F
AULTY COOLANT SHUT
-
OFF VALVE
(
COOLANT FLOW SWITCH CONTACTS ARE
OPEN
)
S
ETUP MEMORY FAILURE
S
ETUP
D
ATA
N
OT
I
NITIALIZED
T
URN THE POWER
ON
BY CLOSING THE MAIN DISCONNECT
SWITCH OR CIRCUIT BREAKER
.
R
EPLACE FUSE
. F
IND AND CORRECT CAUSE
.
C
HECK FOR SHORTED OUT LIFT VALVE SOLENOID
.
C
HECK THE SWITCH FOR MALFUNCTION OR LOOSE CONNECTIONS
.
C
HECK ALL WIRING TERMINALS FOR CONTACT AND TIGHTNESS
.
C
HECK POWER SUPPLY AND TRANSFORMER FUSES
.
C
HECK POWER SUPPLY
,
POWER SUPPLY CABLES AND RIBBON
CABLE GOING TO DISPLAY BOARD
.
C
HECK SECONDARY VOLTAGE ON TRANSFORMER
.
C
HECK THE VOLTAGE AT YOUR ENTRANCE METER
. C
OMPARE
THAT READING TO A READING TAKEN AT THE MOTOR TERMINALS
.
U
SE THESE TWO READINGS AS A BASIS FOR LOCATING THE
SOURCE OF LOW VOLTAGE
.
C
ORRECT THE SITUATION IN ACCORDANCE WITH THE
INSTRUCTION IN THE
H
IGH
D
ISCHARGE
A
IR
T
EMPERATURE
SECTION OF THIS TROUBLESHOOTING GUIDE
. R
ESTART THE
COMPRESSOR
.
C
HECK
HAT
SWITCH
. C
ONTACT AN AUTHORIZED
Q
UINCY
SERVICE TECHNICIAN FOR REPAIRS
.
D
ETERMINE AND CORRECT THE CAUSE OF THE MOTOR
OVERLOADED CONDITION
. R
ESET OVERLOAD RELAY
.
R
EPLACE RELAY
.
E
NSURE ADEQUATE WATER SUPPLY PRESSURE AND FLOW IS
AVAILABLE AND SUPPLY VALVE IS OPEN
. V
ERIFY THERE IS NOT
EXCESSIVE BACKPRESSURE ON THE DRAIN SIDE OF THE WATER
SYSTEM
. R
EPLACE FAULTY WATER FLOW SWITCH
.
T
URN POWER OFF AND THEN BACK ON
.
C
HECK POWER CABLE AND CONNECTION BETWEEN
DC
POWER
SUPPLY AND MICROPROCESSOR
.
C
ONTACT AN AUTHORIZED
Q
UINCY SERVICE TECHNICIAN TO
CHECK FOR MICROPROCESSOR FAILURE AND CHECK FOR IMPROPER
VOLTAGE FROM THE
DC
POWER SUPPLY
.
I
NITIALIZE SETUP DATA AS DESCRIBED ON PAGE
37 .