Siemens Sinamics S120 Function Manual page 326

Function modules
7.3 Extended Brake Control
Commissioning
The extended brake control function can be activated while the commissioning wizard is
running. Activation can be checked in parameter r0108.14.
Unless you change the default settings, the extended brake control function behaves in
exactly the same way as the simple brake control function.
Brake control will be activated automatically (p1215 = 1) when the Motor Module has an
internal brake control and a connected brake has been found.
If no internal brake control is available, the control can be activated using a parameter
(p1215 = 3).
In the case of brakes with a feedback signal (p1222), the inverted signal must be connected
to the BICO input for the second (p1223) feedback signal. The brake closing and opening
times can be set in p1216 and p1217.
Note
If p1215 = 0 (no brake available) is set when a brake is present, the drive runs with applied
brake. This can destroy the brake.
CAUTION
It is only permissible to activate brake control monitoring for booksize power units and
blocksize power units with Safe Brake Relay (p1278 = 0).
Examples
Start-up with brake applied
When the motor is switched on, the setpoint is enabled immediately (providing the required
enabling signals have been issued) even if the brake has not yet been released (p1152 = 1).
The factory setting p1152 = r0899.15 must be disconnected. The drive starts to generate
torque against the applied brake. The brake is not released until the motor torque or current
(p1220) has exceeded braking threshold 1 (p1221). Depending on the type and version of
the brake, it may take some time for it to be fully released. Note that once the braking
threshold torque has been exceeded, the operation enabling signal (p0899.2) is interrupted
while the brake is being released (p1216) to ensure that the motor current does not exceed
the permissible limit values during this period and/or the motor torque generated does not
damage the brake. Interval p1216 must be set on the basis of the time the brake actually
requires to release.
Emergency brake
If emergency braking is required, the brake must be applied both electrically and
mechanically. This can be achieved by using OFF3 as a tripping signal for emergency
braking:
p1219[0] = r0898.2 and p1275.00 = 1 (OFF3 to "Apply Brake Immediately" and invert signal).
To ensure that frequency converter does not operate against the brake, the OFF3 ramp
(p1135) should be set to 0 seconds. Regenerative energy can be generated, which must be
either fed back to the line supply or dissipated by means of a braking resistor.
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Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Drive functions