Quinny QSD 65040-AB User Manual
Section IX - Troubleshooting
Probable Causes:
Corrective Action:
Quincy Compressor
®
- QSD™
77
Thermal Overload Relays Tripping:
L
OOSE
SIGNAL
WIRE
FROM
OVERLOAD
(
S
)
I
NCORRECT
THERMAL
OVERLOAD
RELAY
SETTING
L
OOSE
MOTOR
OR
STARTER
WIRING
C
HECK
SIGNAL
WIRE
CONNECTIONS
.
C
HECK
MOTOR
NAMEPLATE
AND
COMPARE
TO
OVERLOAD
RELAY
SETTING
SPECIFICATIONS
.
C
HECK
ALL
CONNECTIONS
FOR
TIGHTNESS
.
C
HECK
VOLTAGE
AND
AMPERAGES
WHILE
OPERATING
THE
UNIT
AT
FULL
LOAD
AND
FULL
PRESSURE
. M
AXIMUM
TOLERANCE
+10%.
C
HECK
MOTOR
STARTER
WIRING
BEFORE
REMOVING
MOTOR
.
R
EMOVE
MOTOR
AND
HAVE
TESTED
AT
AUTHORIZED
MOTOR
MANUFACTURER
REPAIR
CENTER
.
R
EPLACE
AIR
FILTER
ELEMENT
.
A
DD
ADDITIONAL
COMPRESSORS
AS
NEEDED
.
L
OCATE
AND
ELIMINATE
AIR
LEAKS
IN
SERVICE
LINES
.
C
ONTACT
AN
AUTHORIZED
Q
UINCY
SERVICE
TECHNICIAN
.
C
HECK
CONTROL
SOLENOID
AND
BLOWDOWN
VALVE
.
R
EADJUST
THE
AIR
PRESSURE
SWITCH
SO
THAT
THE
UNLOAD
PRESSURE
DOES
NOT
EXCEED
THE
MAXIMUM
RECOMMENDED
OPERATING
PRESSURE
.
LOW
VOLTAGE
F
AULTY
MOTOR
Low Delivery Pressure:
P
LUGGED
AIR
INTAKE
FILTER
E
XCESSIVE
DEMAND
- E
XCEEDS
SUPPLY
E
XCESSIVE
LEAKS
IN
SERVICE
LINES
F
AULTY
LINE
PRESSURE
TRANSDUCER
High Interstage Pressure:
B
LOWDOWN
VALVE
NOT
RELIEVING
PRESSURE
A
IR
PRESSURE
SWITCH
NOT
SET
CORRECTLY
(O
PERATING
IN
B
ACK
-
UP
M
ODE
)