Danfoss VACON 3000 Application Manual page 297

VACON® 3000
Application Guide
8.2.33.15 Fault Code 49, ID 915 - Pre-charge
Cause
• The DC-link voltage is too low to complete the synchronization.
Troubleshooting
• Make sure that the synchronization threshold voltage is sufficient.
• Make sure that the LC filter capacitance is not too large.
8.2.33.16 Fault Code 49, ID 916 - Pre-charge
Cause
• AFE cannot synchronize with the grid voltage in the approved time limit.
Troubleshooting
• Make sure that the grid voltage is stable or that the imbalance is not too high.
8.2.33.17 Fault Code 49, ID 917 - Pre-charge
Cause
• Main contactor pilot relay close timeout.
• The main contactor pilot relay did not close within the expected time.
Troubleshooting
• Check the relay wiring.
8.2.33.18 Fault Code 49, ID 918 - Pre-charge
Cause
• The AFE lost synchronization with the grid while it waited for the mains contactor to close.
Troubleshooting
• –
8.2.33.19 Fault Code 49, ID 919 - Pre-charge
Cause
• Main contactor close timeout.
• The main contactor did not close within the expected time.
Troubleshooting
• Check the main contactor wiring and main contactor pilot wiring.
8.2.33.20 Fault Code 49, ID 920 - Pre-charge
Cause
• The main contactor opened during the DC stabilization phase.
Troubleshooting
• Check the main contactor wiring and main contactor pilot wiring.
8.2.33.21 Fault Code 49, ID 921 - Pre-charge
Cause
• The front end could not make the DC-link voltage stable in the necessary time.
• The AFE was unable to commit to DC voltage control mode within the allotted time.
Troubleshooting
• Make sure that the grid voltage feedback configuration is correct (line or phase voltage measurement).
• Make sure that the feedback agrees with the AFE phase order.
• Make sure that the phase shift of the potential transformer is accounted for in the PLL adaptation angle parameter.
Danfoss A/S © 2021.09
Fault tracing
AB319735759636en-000101 / DPD01822 | 297