95 of 222 pages
Operating and service manual
207
Psuc invalid
Warning
Description
Compressor Suction Pressure transmitter Invalid
Cause
Indication of defective compressor suction pressure transmitter or its measuring
circuitry
Trouble
shooting
Possible causes:
•
Connector for suction pressure transmitter Psuc not correctly mounted.
•
Suction pressure transmitter Psuc defective.
•
Cable for suction pressure transmitter Psuc defective.
•
X1 cable is defective.
•
Controller PCB defective.
Accompanied alarms:
•
AL 204, AL 205, AL 206 or 250 may also be active.
Trouble shooting:
Disconnect the cable for Psuc from the connector PCB according to the wiring schematics
inside the control cabinet and from the suction pressure sensor.
1)
Check that the connector is mounted correctly according to the drawing for
pressure transmitter AKS or NSK respectively. The earth stud must be on the opposite
side of the cable (AKS):
Figure for AKS
Figure for NSK
1)
Check the cable (measure the resistance in the cable). If the cable is defect,
replace cable.
2)
Mount the cable for Psuc in controller cabinet and on the sensor. Disconnect
signal wire on interface/terminal block PCB. Measure voltage between wire and GND on
interface/terminal block PCB.
AKS: If voltage is below 0.5V DC, sensor or connection between sensor and cable is
defect. If voltage is between 0.5V DC and 4.5V DC, continue to 4).
NSK: If voltage is below 0.37V DC, sensor or connection between sensor and cable is
defect. If voltage is between 0.37V DC and 4.0V DC, continue to 4).
3)
Mount signal wire. Measure voltage between SIGNAL and GND.
AKS: If voltage is between 0.5V DC and 4.5V DC and this alarm is still active, replace
controller door.
NSK: If the voltage is between 0.37V DC and 4.0V DC and this alarm is still active,
replace controller door.
Before replacing controller door see Trouble shooting for Star Cool Controller
p.56
Criteria
Value below alarm limit -0.9 BarE (-13 Psi) or above 11.8 BarE (171 Psi). Value invalid
for 30 sec. for alarm activation.
Controller
action
Replacement by new value from AAS system.
Log
X
Alarm
X
Alarm light
Off
Consequence
Elimination
When sensor value becomes valid, it is marked as inactive in alarm list and may then be
deleted. Value must be valid for 60 sec. to set alarm inactive
Log data
Parm 1
Parm 2
Parm 3
Parm 4
Parm 5
Active/Inactive 0
0
0
1 Supply
3 Output
2 Ground
2
3
1
Supply voltage
Ground
Output
Ø0.95"
(Ø24.0) Typ