Protection Mode - Danfoss VLT FC 102 Programming Manual

Programming Guide | VLT® HVAC Drive FC 102

Protection Mode

2.3
Once a hardware limit on motor current or DC-link voltage is exceeded, the drive enters protection mode. Protection mode means a
change of the PWM modulation strategy and a low switching frequency to minimize losses. This continues for 10 s after the last fault and
increases the reliability and robustness of the drive while re-establishing full control of the motor.
The following situations cause the drive to enter protection mode:
Undervoltage, the voltage has dropped below the low limit.
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Overvoltage, the voltage has exceeded the upper limit. Protection mode can be avoided by activating overvoltage control in
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parameter 2-17 Overvoltage Control. However, activating overvoltage control extends the ramp times.
Overcurrent, the current has exceeded the limit defined in parameter 4-18 Current Limit.
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Ground fault, a ground fault has appeared.
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To remove protection mode, set parameter 14-26 Trip Delay at Inverter Fault to 0.
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