Quincy Compressor QSD 65040-AB, Instruction Manual, Page: 74 / 86

Section IX - Troubleshooting
Probable Causes: Corrective Action:
72
Quincy Compressor ® - QSD™
Unscheduled Shutdown (continued):
C
HECK LIFT VALVE
,
BLOWDOWN VALVE AND MINIMUM PRESSURE
CHECK VALVE OPERATION
.
C
ONTACT AN AUTHORIZED
Q
UINCY SERVICE TECHNICIAN FOR
REPAIRS
.
C
HECK COOLANT SHUT
-
OFF VALVE AND WATER SUPPLY
.
C
ORRECT THE CAUSE OF THE MOTOR OVERLOADED CONDITION
,
RESET THE OVERLOAD RELAY AND PRESS THE RESET BUTTON
.
C
HECK MOTOR NAMEPLATE AND COMPARE TO OVERLOAD RELAY
SETTING
.
T
IGHTEN MOUNTING SCREWS ON THERMAL OVERLOAD
.
C
HECK ALL WIRING TERMINALS FOR CONTACT AND TIGHTNESS
.
C
HECK POWER SUPPLY AND TRANSFORMER FUSES
.
C
HECK THE POWER SUPPLY
,
POWER SUPPLY CABLES AND RIBBON
CABLE GOING TO DISPLAY BOARD
.
C
HECK VOLTAGE AND AMPERAGES WHILE OPERATING AT FULL
LOAD PRESSURE
.
R
EPLACE RELAY
.
C
HECK MOTOR STARTER WIRING BEFORE REMOVING MOTOR
.
R
EMOVE MOTOR AND HAVE TESTED AT MOTOR MANUFACTURER
REPAIR CENTER
.
C
HECK WIRE CONNECTION BETWEEN RESISTANCE TEMPERATURE
DETECTOR AND MICROPROCESSOR BOARD
. I
F
RTD
PERFORMANCE IS QUESTIONABLE
,
CONTACT AN AUTHORIZED
Q
UINCY SERVICE TECHNICIAN
.
C
HECK WIRE CONNECTIONS OF PRESSURE SENSORS
.
R
EPLACE SENSORS
.
C
ORRECT THE CAUSE OF THE OVERLOAD CONDITION
. R
ESET THE
OVERLOAD RELAY AND PRESS
ENTER.
C
HECK FOR PROPER AIREND ROTATION
.
R
EDUCE
“R
AMP
”
TIME ON REMOTE LOW VOLTAGE OR SOLID
STATE STARTERS
.
H
IGH PRESSURE DIFFERENTIAL
C
OOLANT FLOW SWITCH OPEN
T
HERMAL MOTOR OVERLOAD RELAYS
TRIPPING
I
NCORRECT THERMAL OVERLOAD RELAY
SETTING
L
OOSE OVERLOAD CONNECTION
L
OOSE WIRE CONNECTIONS
P
OWER FAILURE
L
OW VOLTAGE
F
AULTY CONTROL RELAY
F
AULTY MOTOR
F
AULTY OR
D
ISCONNECTED
RTD
F
AULTY OR
D
ISCONNECTED
P
RESSURE
S
ENSORS
M
OTOR
O
VERLOAD
R
EVERSE
R
OTATION