Emerson CoreSense Technical Information page 17

Technical Information
Flash
Alarm conditions
code
8 Trip: Appears when there is a low
Low voltage compressor voltage.
9 Trip: Appears when the voltage
Voltage imbalance value exceeds the set
imbalance value (default 5%).
Possible failure reasons
Supply voltage is not in the
specified range.
Loose wiring connections at the
terminal plate.
Worn out contactors.
Faults with other peripheral
electrical loads.
Loose wiring connections at the
compressor terminal plate inside T-
Box.
Worn out contactors.
Faults with other peripheral
electrical loads.
Single phasing conditions.
Troubleshooting measures
Verify voltage supply from the main buss.
Verify voltage into and out of contactor (repair or replace contactor if necessary).
Measure voltage at the compressor terminal (refer to AE10-1244, Recommended
Contactor Selection for 3-Phase Motor Control – Power Supply Problems).
Verify that motor electrical connections are tight at the compressor.
Verify that there are not any faults with other peripheral electrical loads (for example
fan motors).
Verify voltage supply from the main buss.
Verify voltage into and out of contactor (repair or replace contactor if necessary).
Measure voltage at the compressor terminal (refer to AE10-1244, Recommended
Contactor Selection for 3-Phase Motor Control– Power Supply Problems).
Verify that motor electrical connections are tight at the compressor.
Verify that there are not any faults with other peripheral electrical loads (for example
fan motors).
D7.21.2/1011/E
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