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VACON® NXP Advanced Safety Options
Operating Guide
12.2.33 Fault Code 20 - Safety System, S43 – SMS, Fault Number 4
Cause
•
An acknowledgment signal was received when the safety function was still requested and could not be acknowledged.
Troubleshooting
•
Deactivate the safety function request before acknowledging.
12.2.34 Fault Code 20 - Safety System, S44 – SSM, Fault Number 2
Cause
•
An acknowledgment signal was received when the safety function was still requested and could not be acknowledged.
Troubleshooting
•
Deactivate the safety function request before acknowledging.
12.2.35 Fault Code 20 - Safety System, S48 – Enc. Common, Fault Number 1, 13
Cause
•
An internal fault in the encoder interface board.
Troubleshooting
•
Reboot the AC drive.
•
If the fault reoccurs, contact the nearest distributor.
12.2.36 Fault Code 20 - Safety System, S48 – Enc. Common, Fault Number 4–8
Cause
•
A fault detected in the encoder signal monitoring.
•
There is excessive ripple in a signal channel.
•
A wrong phase shift between signals.
Troubleshooting
•
Check the encoder connections.
•
Check the encoder.
12.2.37 Fault Code 20 - Safety System, S48 – Enc. Common, Fault Number 9
Cause
•
Reference pulse from the encoder is missing or detected too often.
Troubleshooting
•
Check the encoder cabling.
•
Check the parameters.
12.2.38 Fault Code 20 - Safety System, S48 – Enc. Common, Fault Number 11
Cause
•
A parameterization fault in the encoder.
Troubleshooting
•
Check the parameters.
12.2.39 Fault Code 20 - Safety System, S48 – Enc. Common, Fault Number 12
Cause
•
The supported operating frequency of the encoder signals was exceeded.
Troubleshooting
•
See the technical data for the used encoder type or information on the maximum frequency.
156 | Danfoss A/S © 2021.06
Fault Tracing
AQ319736045637en-000101 / DPD01798
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