Siemens SINUMERIK MC Commissioning Manual page 110

Safety functions integrated in the drive
4.5 SBC (Basic/Extended)
The opening and closing of the brake is controlled by the Motor Module / Power Module.
Terminals are available for this on the device in booksize format. A Safe Brake Relay is also
required for the "Safe Brake Control" in the blocksize format. With the chassis format (article
numbers ending 3 or higher), a Safe Brake Adapter is required. When the Power Module is
configured automatically, the Safe Brake Relay is detected and the motor holding brake type is
defaulted (p1278 = 0).
Brake activation via the brake connection on the Motor Module / Safe Brake Relay (SBR) / Safe
Brake Adapter (SBA) involves a safe, two-channel method.
Note
Controlling the brake via a relay for "Safe Brake Control":
If you use the "Safe Brake Control (SBC)" function, the use of relays/contactors can cause
faults in the brake control when brakes are switched. For this reason, this type of control is not
generally enabled.
An interrupted cable or a short-circuit in the brake winding is only detected when the state
changes, i.e. when the brake either opens or closes. For devices in the chassis format with
connected Safe Brake Adapter, the connecting cable between the Safe Brake Adapter and the
motor brake is not monitored for an interrupted cable or short-circuit.
Undesirable motor motion due to a defective brake
The "Safe Brake Control" function does not detect mechanical defects of the brake. A
defective brake can result in unwanted motor motion, which may result in injury or death.
● Test the brake using the Safety Integrated diagnostics function "Safe Brake Test (SBT)"
Functional features of "Safe Brake Control"
● SBC is executed when "Safe Torque Off" (STO) is selected.
● In contrast to conventional brake control, SBC is executed via two channels.
● SBC is executed regardless of the brake control or mode set in p1215. SBC is not
recommended, however, when 1215 = 0 or 3.
● The function must be enabled using parameters.
● When the state changes, electrical faults, such as a short-circuit in the brake winding or wire
breakage can be detected.
Enabling the "Safe Brake Control" function
The "Safe Brake Control" function is enabled via parameter p9602.
The SBC function can be used only together with STO. The selection of SBC alone is not
possible.
110
WARNING
(for further information, see Section "Enabling the function (Page 173)").
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB