Safe Brake Control (Sbc) - Siemens Sinumerik 840D sl Function Manual

Safety Functions integrated in the drive

4.5 Safe Brake Control (SBC)

4.5 Safe Brake Control (SBC)
Description
Safe Brake Control is used to control actuators that function according to the
closed--circuit principle (e.g. brake).
The command for releasing or applying the brake is transmitted to the Motor
Module/Power Module via DRIVE--CLiQ. The Motor Module then carries out the
action and activates the outputs for the brake.
Brake activation via the brake connection on the Motor Module is carried out using
a safe, two--channel method.
Note
This function is only supported by chassis components that can be identified by
the MLFB ending ...xxx3. A Safe Brake Adapter is needed in addition for this
design.
To ensure that this function can be used for Blocksize Power Modules, a Safe
Brake Relay must be used. When the Power Module is configured automatically,
the Safe Brake Relay is detected and the motor holding brake type is preassigned
(p1278 = 0).
Warning
!
The Safe Brake Control function does not detect faults in the brake itself -- such as
e.g. brake winding short--circuit, worn brakes and similar.
If a cable breaks, this is only recognized by the Safe Brake Control function when
the status changes, i.e. when the brake is applied/released. This does not apply
when using an SBA.
Functional features of Safe Brake Control (SBC)
S When Safe Torque Off is selected or when safety monitoring functions respond,
SBC is performed with safe pulse cancelation.
S Unlike conventional brake control, SBC is executed via p1215 through two
channels.
S SBC is initiated independently of the brake control mode set in p1215. However,
SBC is not recommended for p1215 = 0 or 3.
S The function must be enabled via parameter.
S When the state changes, electrical faults, such as e.g. a short--circuit in the
brake winding or wire breakage can be detected.
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
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