Danfoss VACON NX All-in-One Application Manual page 328

VACON® NX All-in-One
Application Guide
Troubleshooting
• Check the load.
• Check the motor.
• Check the cables and connections.
• Make an identification run.
11.1.5 Fault 2 - Overvoltage, Subcode S1 - Hardware trip
Cause
The DC-link voltage is higher than the limits.
• Too short a deceleration time
• High overvoltage spikes in the supply
• Start/Stop sequence too fast
Troubleshooting
• Set the deceleration time longer.
• Use the brake chopper or the brake resistor. They are available as options.
• Activate the overvoltage controller.
• Do a check of the input voltage.
11.1.6 Fault 2 - Overvoltage, Subcode S2 - Overvoltage control supervision
Cause
The DC-link voltage is higher than the limits.
• Too short a deceleration time
• High overvoltage spikes in the supply
• Motor load is generative
• Start/Stop sequence too fast
Troubleshooting
• Set the deceleration time longer.
• Use the brake chopper or the brake resistor. They are available as options.
• Activate the overvoltage controller.
• Do a check of the input voltage.
11.1.7 Fault 2 - Overvoltage, Subcode S3 - LCL capacitor overvoltage ripple
Cause
AFE LCL filter capacitor ripple voltage is too high
Troubleshooting
Check the capacitance rating and measure the capacitance value of the LCL filter capacitors and make sure that the value and rating
is according to specifications.
11.1.8 Fault 3 - Earth fault
Cause
The measurement of current tells that the sum of the motor phase current is not zero.
• Insulation malfunction in the cables or in the motor.
It is possible to set different responses in the application for this fault. See parameter group Protections.
Troubleshooting
Do a check of the motor cables and the motor.
328 | Danfoss A/S © 2023.02
Fault Tracing
AB296635287482en-000301 / DPD00903