Chapter 5.0 lTroubleshooting
5.1 Alarm and Fault Indications
The first step in troubleshooting is to gather as many facts as possible. Compressor fault and event logs provide
factual historical information that will indicate the exact reason that the compressor shut down, the frequency of
faults and compressor starts, as well as the value of pertinent parameters at the time of the fault. These logs should
be reviewed in detail to gain information to allow efficient troubleshooting for any fault.
5.1.1 Alarm Types
Alarms indicate compressor operating conditions are beyond set limits of the normal operating envelope or set
alarm limits. Compressor alarms will allow the compressor to run, but speed is typically reduced to bring the
condition under the alarm limit. Refer to Table 5-1 Alarm Types.
Table 5-1 Alarm Types
Compressor Status Alarm
Description
3-Phase Over-Current
The calculated 3 phase current has exceeded the alarm limit.
Cavity Temperature
The measured cavity temperature has exceeded the alarm limit.
Discharge Pressure
The measured discharge pressure has exceeded the alarm limit.
Discharge Temperature
The measured discharge temperature has exceeded the alarm limit.
(Removed from CC 4.X.X software)
Inverter Cooling Control
The Measured Inverter Temperature has exceeded the Inverter Cooling Control Fault limit, starting the Fault Delay timer.
Inverter Temperature
The measured Inverter temperature has exceeded the alarm limit.
Leaving Fluid
Temperature
The lowest acceptable measured leaving fluid temperature has exceeded the alarm limit.
(Removed from CC 4.X.X software)
Motor Cooling Control
The Measured Cavity Temperature has exceeded the Motor Cooling Control Fault limit, starting the Fault Delay timer.
Pressure Ratio
The calculated pressure ratio of discharge/suction has exceeded the alarm limit.
SCR Temperature
The measured SCR temperature has exceeded the alarm limit.
(Sensor removed from Rev. H compressors)(Fault and Alarm removed from CC 4.2.X and later software)
Suction Pressure
The measured suction pressure has exceeded the alarm limit.
Superheat
The calculated superheat temperature has exceeded the alarm limit. The superheat alarm is set 8°K below the fault limit.
5.1.2 Fault Types
Critical and non-critical faults indicate compressor operating conditions are beyond set limits of the normal
operating envelope or set fault limits. Exceeding fault limits will stop the compressor in 10 seconds or less. Refer to
the following tables:
l
Table 5-2 Compressor Fault Types on page 252
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Table 5-3 Compressor Status 2 Faults on page 253
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Table 5-4 Motor Fault Types on page 253
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Table 5-5 Bearing Fault Types on page 254
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