Danfoss iC2-Micro Series - Control with Brake Function

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Design Guide | iC2-Micro Frequency Converters iC2-Micro Frequency Converters

3.7.3.4 Control with Brake Function

The brake is protected against short-circuiting of the brake resistor, and the brake transistor is monitored to ensure that short-circuiting

of the transistor is detected. A relay/digital output can be used for protecting the brake resistor from overloading caused by a fault in the

drive.

In addition, the brake enables readout of the momentary power and the mean power for the latest 120s. The brake can also monitor the

power energizing and make sure that it does not exceed a limit selected in parameter P 3.3.3 Brake Resistor Power Limit.

 WARNING

Monitoring the brake power is not a safety function. A thermal switch is required to avoid the brake power from exceeding the

limit. The brake resistor circuit is not ground leakage protected.

Overvoltage control (OVC) (exclusive brake resistor) can be selected as an alternative brake function in parameter P 2.3.1 Overvoltage

Controller Enable. This function is active for all units. The function ensures that a trip can be avoided if the DC-link voltage increases. This

is done by increasing the output frequency to limit the voltage from the DC link. It is a useful function, for example, if the ramp-down

time is too short to avoid tripping of the drive. In this situation, the ramp-down time is extended.

 NOTICE

OVC can be activated when running a permanent magnet motor (when parameter P 4.2.1.1 Motor Type is set to [1] PM, Non-

salient SPM).

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