Dear Experts

One of our HMCs having brake for vertical axis.

When axis was moved down, it was ok but when moved up then after moving a little by upto 10 mm, ( we could physically see the movement of axis) error 409 - Abnormal torque, error 410 - Excess error (Stop) - we could also hear sound of brake release

We have decoupled the motor from gearbox & in decoupled condition also, clockwise rotation having no problem but during counterclockwise rotation, after rotating for say one rotation, stops with Vibration on Motor and error 409 - Abnormal torque, error 410 - Excess error (Stop)

We found 24V to brake was not coming and hence SMPS replaced then OK

Please let us know in case brake was not getting opened due to inadequate 24V, then how was it moving freely in both coupled and decoupled condition in one direction and error was only in another direction

Regards