
Operating and service manual
94 of 222 pages
205
Psuc short
Warning
Description
Compressor Suction Pressure Short Circuit
Cause
Indication of short-circuited compressor suction pressure sensor
Trouble
shooting
Possible causes:
•
Connector for suction pressure sensor Psuc not correctly mounted.
•
High pressure sensor Psuc defective.
•
Cable for high pressure sensor Pdis defective.
•
X1 cable is defect.
•
Controller PCB defective.
Accompanied alarms:
•
AL 207.
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
2)
Check the cable (measure the resistance in the cable).
If the cable is defect, replace cable.
3)
Mount the cable for Pdis 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).
4)
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 above low alarm limit -0.9 BarE (-13 Psi)
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.
Log data
Parm 1
Parm 2
Parm 3
Parm 4
Parm 5
Active/Inactive Low limit
High limit
Current
1 Supply
3 Output
2 Ground
2
3
1
Supply voltage
Ground
Output
Ø0.95"
(Ø24.0) Typ