Danfoss iC2 Application Manual page 270

Application Guide | iC2-Micro Frequency Converters
WARNING/FAULT 26, Brake Resistor Power Limit
Cause
The power transmitted to the brake resistor is calculated as a mean value over the last 120 s of run time. The calculation is based on the
DC-link voltage and the brake resistor value set in P 3.3.2 Brake Resistor Value. The warning is active when the dissipated braking power
is higher than the value set in P 3.3.3 Brake Resistor Power Limit. The drive trips if the warning persists for 1200 s.
Troubleshooting
Decrease brake energy via lower speed or longer ramp time.
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FAULT 27, Brake IGBT/Brake Chopper Short Circuited
Cause
The brake transistor is monitored during start-up. If a short circuit occurs, the brake function is disabled, and an fault is issued. The drive
is tripped.
Troubleshooting
Remove the power to the drive and remove the brake resistor.
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FAULT 28, Brake Check
Cause
The brake resistor is not connected or not working.
Troubleshooting
Check if the brake resistor is connected or it is too large for the drive.
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FAULT 30, Motor Phase U Missing
Cause
Motor phase U between the drive and the motor is missing.
Troubleshooting
Turn off the drive and check motor phase U.
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FAULT 31, Motor Phase V Missing
Cause
Motor phase V between the drive and the motor is missing.
Troubleshooting
Turn off the drive and check motor phase V.
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FAULT 32, Motor Phase W Missing
Cause
Motor phase W between the drive and the motor is missing.
Troubleshooting
Turn off the drive and check motor phase W.
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