u/BraveGrapefruit2869 — reddlx

Hi everyone,

I’m working with a technology object axis and a SINAMICS S120 drive, and I’ve run into an issue with brake control when using MC_Power. The brake contactor is connected to the BR+ and BR- terminals of the S120.

In my current setup, as soon as I enable the axis using MC_Power, the brake is immediately released. However, this is not the behavior I’m aiming for.

What I would like instead is the following:

After enabling the axis (MC_Power = TRUE), the brake should remain closed.
The brake should only be released when a motion command is executed, specifically when MC_MoveVelocity is triggered, since I want to control the drive using this function.

At the moment, it looks like the only way to prevent the brake from releasing after MC_Power is enabled would be to activate MC_Power only when a motion is actually required.

Any advice or best practices would be appreciated.