SIEMENS
SINAMICS S150 NEMA
Engineering Information
3
Siemens D21.7
(Part 2) – 2015
3/22
Safe Brake Control (SBC)
The SBC function permits the safe control of a holding brake.
SBC (when enabled) is always activated in parallel with STO.
Effect
A holding brake which is active in a de-energized state
is controlled and monitored using safe two-channel
technology. Due to the two-channel control, the brake may
still be activated in the event of an insulation fault in the
control cable. Test pulses are used to ensure early detection
of such faults.
Notes
The safe brake control does not detect mechanical faults in
the brake, for example worn brake pads.
The motor brake terminals are integrated with Motor
Modules in booksize format. An additional Safe Brake
Adapter is required for power units in chassis format.
Application
The SBC function is used in conjunction with the functions
STO or SS1 to prevent the movement of an axis in the
torque-free state, e.g. due to gravity.
Customer benefits
Again, the function saves the use of external hardware and
the associated wiring.
SBC – Safe Brake Control
Safe Brake Test (SBT)
The SBT function carries out a brake function test at
regular intervals.
Effect
The proper functioning of brakes that have become worn is
checked by application of a torque to the closed brake. Drive
systems that have two brakes, e.g. motor brake and external
brake, can be tested with different torque values.
Application
The SBT function is suitable for implementing a safe brake
in combination with the SBC function.
Customer benefits
The function detects faults or wear in the mechanical
components of the brake. Automatic brake function tests
reduce maintenance overheads and increase the safety
and reliability of the machine/plant.
Safe Brake Test (SBT)
Safety Integrated – Description of functions
(continued)
v
t
G_D211_XX_00276
STO
SBC
G_D211_XX_00311
M
,
s
t
SBT
G_D213_EN_00090a
Brake
diagnostics
Motor holding
brake
Safe Brake Adapter
M
M
AC 230 V
Safe Brake Adapter
The Safe Brake Control (SBC) function requires a Safe Brake
Adapter (option
K88
for SINAMICS S150).
The Safe Brake Adapter allows safe control of
electro-mechanical motor brakes.
The Safe Brake Adapter controls 230 V AC brakes. The SBC
function monitors the control of the brake, but not the
mechanical components of the brake.
The drive controls the connected brake using the motor
holding brake function.
External overvoltage limiters are not required.
With the Safe Brake Adapter function, the brake is controlled
in accordance with IEC 61508 SIL 2 and EN ISO 13849-1 PL d
and Category 3.
Safe Brake Control (SBC)
Safe Brake Adapter