Hey,

We have an ac drive inverter with braking unit, in order to meet the working requirement, change the original acceleration and deceleration time from 10s to 6s, is it harm the electric motor? Do we need to install a bigger brake unit?

(PS: After we change the parameters for a few months, the ac drive always appear overcurrent alarm these days, then we change the parameter to 10 and the alarm eliminated, still can't find out why)

You adjusted the AC drive acceleration and deceleration time to short, it's definitely will increase of the brake unit. At the beginning the inverter drive running with no problem but caused over current alarm after a few months, if the load is not increased significantly, then it should be the brake resistor being used for a long time and lead to heating, resulting in the resistance value becomes small, then braking unit efficiency decline, replace the braking resistor would solve such problem.

Adjust the inverter acceleration time too short will cause high starting current of the electric motor, then lead to the frequency inverter occur over current; if the deceleration time too short under heavy inertia load situation, it will cause reverse current flow from the electric to the inverter drive, cause the frequency inverter over voltage; You can adjust the ac drive inverter parameters to avoid over-voltage or over-current alarm within a certain range, generally the inverter drive built-in brake unit for less than 15 kilowatts, but more than 15 kW you need to install additional braking unit and braking resistor.

According to your description, obviously you want to set acc/dec time to 6s, then you need to increase the power of braking unit and braking resistor, and reduce the resistor value!

Another way is to replace a larger inverter drive!

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