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M-SV-001-EN Rev. G
Chapter 5.0 Troubleshooting
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
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 "Table 5-2 Compressor Fault Types", "Table 5-3 Compressor Status 2 Faults",
"Table 5-4 Motor Fault Types", and "Table 5-5 Bearing Fault Types".
Table 5-2 Compressor Fault Types
Compressor Description
Inverter Temperature The measured Inverter temperature has exceeded the fault limit.
Discharge Temperature The measured discharge temperature has exceeded the fault limit.
Soft Start Temperature The measured temperature has exceeded the fault limit.
Low Suction Pressure The measured suction pressure has exceeded the fault limit.
Discharge Pressure
The measured discharge pressure has exceeded the fault limit.
Instantaneous lock-out at fault level.
3-Phase Over-Current
The calculated 3 phase current has exceeded the fault limit.
Instantaneous lock-out at fault level.
Cavity Temperature The measured cavity temperature has exceeded the fault limit.
Leaving Fluid Temperature
The lowest acceptable measured leaving fluid temperature has been
exceeded.
Pressure Ratio
The calculated pressure ratio of discharge/suction has exceeded the fault
limit.
Compressor Alarm Description
Inverter Temperature The measured Inverter temperature has exceeded the alarm limit.
Discharge Temperature The measured discharge temperature has exceeded the alarm limit.
Suction Pressure The measured suction pressure has exceeded the alarm limit.
Discharge Pressure The measured discharge pressure has exceeded the alarm limit.
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.
Leaving Fluid Temperature
The lowest acceptable measured leaving fluid temperature has exceeded
the alarm limit.
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.
Superheat
The calculated superheat temperature has exceeded the alarm limit.
The difference between the fault limit and the alarm limit is the dead band
for the control. The superheat alarm is always set 8°K below the fault limit.
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