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 en-
able signals are issued), even if the brake has not yet been released (p1152 = 1).
The factory setting p1152 = r0899.15 must be separated here. The drive first gen-
erates torque against the applied brake. The brake is not released until the motor
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 in the example. This can be achieved if OFF3 is used as a tripping
signal for emergency 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.
4.4.5 Commissioning
Extended brake control is activated when you are working through the commis-
sioning Wizard. Parameter r0108.14 indicates whether the function module has
been activated.
If no changes have been made to the initial setting, this brake control behaves as
the simple brake control.
Brake control is activated automatically (p1215 = 1) if the component has an inter-
nal brake control function and a connected brake has been found.
If the component does not have an internal brake control function, control can be
activated via parameter (p1215 = 3).
Caution
If p1215 = 0 (no brake available) is set when a brake is present, the drive runs with
an applied brake. The can cause damage to the brake.
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© Siemens AG, 2005. All rights reserved
SINAMICS S120 Function Manual, 06/05 Edition