Examples - Siemens SINAMICS S120 Function Manual

Extended Functions
"Extended brake control" function module
4.4.4

Examples

Starting against applied brake
When the device is switched on, the setpoint is enabled immediately (if other ena-
ble signals are issued), even if the brake has not yet been released (p1152 = 1).
The factory setting p1152 = r0899.15 must be disconnected here. The drive first
generates torque against the applied brake. The brake is not released until the mo-
tor torque or motor current (p1220) has exceeded braking threshold 1 (p1221).
This configuration is used, for example, when the drive is connected to a belt that
is under tension (loop accumulator in the steel industry).
Emergency brake
If emergency braking is required, electrical and mechanical braking is to take place
simultaneously. This can be achieved if OFF3 is used as a tripping signal for emer-
gency braking:
p1219[0] = r0898.2 (OFF3 to "apply brake immediately").
This is often used, for example, in calendar stacks, cutting tools, running gears,
and presses.
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© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition