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VACON® 3000
Application Guide
8.2.33.22 Fault Code 49, ID 922 - Pre-charge
Cause
•
The AFE was stopped while the INU was in operation.
Troubleshooting
•
Always stop the INU before shutting down the AFE.
8.2.33.23 Fault Code 49, ID 923 - Pre-charge
Cause
•
The front end could not keep up the DC-link voltage stabilization.
•
AFE or DFE voltage regulation could not be maintained.
Troubleshooting
•
Check the DC voltage control parameters and the synchronous current controller parameters.
8.2.33.24 Fault Code 49, ID 924 - Pre-charge
Cause
•
Parameter settings changed after the pre-charge sequence was activated.
Troubleshooting
•
Do not change the pre-charge configuration after starting the pre-charge sequence.
8.2.33.25 Fault Code 49, ID 925 - Pre-charge
Cause
•
The parameter settings are not valid.
Troubleshooting
•
Do not select the test modes "disable mains contactor" and "dry run" at the same time.
8.2.33.26 Fault Code 49, ID 926 - Pre-charge
Cause
•
Test mode activated while grid voltage is connected.
Troubleshooting
•
Do not select the "dry run" test mode while grid voltage is connected.
8.2.33.27 Fault Code 49, ID 927 - Pre-charge
Cause
•
The INU had a fault during the pre-charge sequence.
Troubleshooting
•
Check the INU status.
8.2.33.28 Fault Code 49, ID 928 - Pre-charge
Cause
•
The pre-charge transformer contactor closed unexpectedly after the pre-charge sequence was completed.
Troubleshooting
•
Check the pre-charge contactor wiring.
8.2.33.29 Fault Code 49, ID 930 - Pre-charge
Cause
•
Breaker enable was lost while the precharge output was active.
Troubleshooting
•
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298 | Danfoss A/S © 2021.09
Fault tracing
AB319735759636en-000101 / DPD01822
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