Controlling a generic voltage at the brake output


The voltage output of the brake can be controlled manually in real-time using the ‘manual output voltage’ mode of the brake release object.


The brake release object can be used for either controlling a brake or a generic voltage but not both.

This allows for custom brake release strategies on the master, as well as providing a generic output for a single phase device connected to this phase (e.g. a fan).

This voltage is applied at:

  • Phase D of SOMANET Node

  • SBC out of SOMANET Node Safety

  • Brake Terminal of SOMANET Circulo


The brake output can be switched off safely when SOMANET Node Safety or SOMANET Circulo is used but not controlled safely.


  • Connect the device to the dedicated brake output of the drive and to Ground (GND).

  • Set object ‘Brake options: Release strategy’ (subitem 0x2004:4) to ‘Manual output voltage’ (0), it is recommended to do so in ‘Brake Configuration’ of the Setup Wizard of OBLAC Drives.

  • Use the SDO object ‘Brake options: Brake status’ (subitem 0x2004:7) for switching the output on and off:

    1: off

    2: on

  • In the master assign ‘Brake options: Output voltage’ (subitem 0x2004:10) to PDO for controlling the output voltage in real-time, the unit is given in mV.

  • While the master is running, control the output voltage by writing the value in mV to ‘Output voltage’.

  • To turn off the output, write a 0 to ‘Output voltage’

..note:: The SBC signal has to provided as well when the voltage shall be switched on with Node Safety or Circulo


Please note that the brake phase voltage control comes with limited accuracy.

Use this feature only in low precision applications (e.g. load-dependant speed of a fan).