Siemens Sinamics S120 Function Manual page 327

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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), then there is a "setpoint

enable from the control" (bit interconnected with p1142, r1229.3, 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 closes when the speed drops below the standstill limit (p1226). After the brake

closing time (p1217), the speed controller is inhibited (no motor force!). Uses extended brake

Example, operating brake for a crane drive

Drive functions

Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2

p1275.02 (1)

Function modules

7.3 Extended Brake Control

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