Danfoss VACON 1000 Operating Manual page 143

Operating Guide | VACON® 1000
Fault Code 52 - Remote Emergency Stop
Cause
The external emergency stop command is effective.
System default operation: No operation
Troubleshooting
Release the remote emergency stop push button.
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Fault Code 53 - PLC–DSP Communication Failure
Cause
The PLC disconnects with the main control system.
System default operation: Alarm. System operation is configurable. The system continues to operate at the reference speed set before
the disconnection.
Troubleshooting
Check the communication circuit.
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Fault Code 54 - PLC–HMI Communication Failure
Cause
The PLC disconnects with the HMI.
System default operation: Alarm
Troubleshooting
Check the communication circuit.
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Fault Code 55 - Upstream Main Circuit Breaker Abnormal Open
Cause
When running, the drive receives the open signal of the high-voltage circuit breaker.
System default operation: Coast stop
Troubleshooting
Check if the input high voltage exists.
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Check that the internal cabling is firm and correct.
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Fault Code 56 - Upstream Main Circuit Breaker Open Failure
Cause
The upstream main circuit breaker did not open in over 3 s after receiving the opening signal.
System default operation: Alarm
Troubleshooting
Check if the input high voltage exists.
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Check that the internal cabling is firm and correct.
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Check if the opening command is sent correctly.
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Fault Tracing
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