Siemens SINAMICS S120 Function Manual page 257

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
Brake control monitoring may only be activated 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 supply system or dissipated by means of a braking resistor.
Operating brake for crane drives
For hoisting gear with a manual control, it is important that the drive immediately responds
when the control lever is moved (master switch). The drive is switched on with an ON
command (p0840) (the pulses are enabled). Speed setpoint (p1142) and speed controller
(p0856) are inhibited. The motor is magnetized. The magnetization time required for three-
phase motors (1-2 seconds), therefore, no longer applies.
The only delay now between actuation of the master switch and movement of the motor is
the brake release time. If the master switch is moved (deflected), there is a "setpoint enable
from the control" (bit interconnected with p1142, p1229.2, p1224.0). The speed controller is
enabled immediately. Once the brake release time has elapsed (p1216), the speed setpoint
is enabled. When the master switch is in the zero position, the speed setpoint is inhibited -
the drive brakes along the deceleration ramp of the ramp-function generator. The brake
Drive functions
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Function modules
7.4 Extended brake control
257