WARNING 25, Brake Resistor Short-circuited
Cause
The brake resistor is monitored during start-up. If a short circuit occurs, the brake function is disabled and the alarm appears. The drive is
tripped.
Troubleshooting
l Remove the power to the drive and check the connection of the brake resistor.
WARNING/ALARM 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 parameter 2-11 Brake Resistor (ohm). The warning is active when the dissipated
braking power is higher than the value set in parameter 2-12 Brake Power Limit (kW). The drive trips if the warning persists for 1200 s.
Troubleshooting
l Decrease brake energy via lower speed or longer ramp time.
ALARM 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 alarm is issued. The drive
is tripped.
Troubleshooting
l Remove the power to the drive and remove the brake resistor.
ALARM 28, Brake Check
Cause
The brake resistor is not connected or not working.
Troubleshooting
l Check if brake resistor is connected or it is too large for the drive.
ALARM 30, Motor Phase U Missing
Cause
Motor phase U between the drive and the motor is missing.
Troubleshooting
l Remove power from the drive and check motor phase U.
ALARM 31, Motor Phase V Missing
Cause
Motor phase V between the drive and the motor is missing.
Troubleshooting
l Remove power from the drive and check motor phase V.
318 | Danfoss A/S © 2024.01 AU275649936274en-001401 / 130R0507
Programming Guide | VLT® AutomationDrive FC 360
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