Brake Functions; Electro-Mechanical Brakes - Siemens SINAMICS G120 Operating Instructions Manual

Functions

8.15 Brake functions

8.15 Brake functions
8.15.1

Electro-mechanical brakes

Functions of the electro-mechanical brake
Warning
Dimensioning the electro-mechanical motor brake
The electro-mechanical brake must be dimensioned that, in case of a fault, the complete
motor can be braked to zero from any possible operational speed. If no electro-mechanical
brake is present, the machine manufacturer must adopt other suitable measures to protect
against motion after the energy supply to the motor has been cut (for example, to protect
against sagging loads).
The electro-mechanical brake can be used as motor holding brake or as an instant brake.
● As motor holding brake it is used to prevent the motor from unintented rotation (e.g. lifting
● As an instant brake it slows down the motor from any speed down to zero speed as fast
To keep the electro-mechanical brake open, it must be energised. When power is lost, or
removed from the brake, the brake closes and the motor shaft is held in position.
Note
If an electro-mechanical brake is attached, parameter P1215 needs to be enabled, otherwise
it will not be possible to run the motor!
8-74
or lowering the load in lifting applications) by applying torque in order to compensate
brake release times. The motor holding brake functionality is triggered by an OFF1 or
OFF3 command. For details see section motor holding brake.
as possible. The related brake release times are not considered in the case. The instant
brake function is triggered by an OFF2 command. The OFF2 command can be given
manually or triggered automatically by an internal fault condition on the inverter. On Fail-
safe inverters this braking function can also be triggered by the Safe Torque Off (STO)
command or the LSTO fault condition. (reference to the Chapter "Functions", Section
"Safe Brake Control
Operating Instructions, 11/2006, A5E00766042B AA
Control Units CU240S