Instant Brake - Siemens SINAMICS G120 Operating Instructions Manual

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Functions
8.15 Brake functions
Note
Motors have optional holding brakes which are not designed to be used as brakes for normal
operation. The holding brakes are only designed for a limited number of emergency braking
operations / motor revolutions with the brake closed (refer to the Catalog data).
When commissioning a motor with integrated holding brake it is therefore absolutely
imperative that it is ensured that the holding brake functions perfectly. A "clicking noise" in
the motor indicates that the brake has been correctly released.
Before the motor holding brake is applied, a torque must be established that maintains the
motor at the required position. The pulses, from the inverter, must be enabled to allow the
necessary torque to be generated. The torque is defined by the minimum frequency in
parameter P1080. A typical value for this is the rated motor slip r0330. Additionally, this
torque can be modified using the following parameters:
● V/f control – boost parameter P1310
● SLVC – boost parameters P1610 and P1611
● VC – supplementary torque setpoint P1511
The motor holding brake can be permanently damaged, if the motor shaft is moved when the
motor holding brake is applied. It is imperative that the release of the motor holding brake is
timed correctly.
8.15.1.3

Instant brake

Data
Parameter range:
Warnings:
Faults:
Function chart number:
Description
An instant brake is an electro-mechanical brake which has to brake down the motor from any
speed down to zero speed. The instant brake function is activated after an OFF2 command
and additional in the case of a fail-safe application after a Safe Torque Off (STO) or a LSTO
fault condition (refer to Chapter "Functions", Section "Safe Brake Control").
The behavior of the instant brake function is described below.
8-80
P1215
P0346, P1216, P1217, P1080
r0052 bit 12
-
-
-
Operating Instructions, 11/2006, A5E00766042B AA
Control Units CU240S

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