Motor Holding Brake - Siemens SINAMICS G120 Operating Instructions Manual

Functions
9.9 Application-specific functions
Procedure: Set dynamic braking
In order to optimally utilize the connected braking resistor, you must know the braking power
that occurs in your particular application.
Table 9- 41
Parameter
p0219
p0844
9.9.3.5

Motor holding brake

The motor holding brake prevents the motor turning when it is switched off. The converter
has internal logic to optimally control a motor holding brake.
The converter-internal control of the motor holding brake is suitable typically for horizontal,
inclined and vertical conveyors.
A motor holding brake can also be useful in several applications for pumps or fans to ensure
that the powered-down motor does not rotate in the wrong direction through a liquid or air
flow.
Connecting the motor holding brake
You have to define which of the digital outputs is to be used for controlling the motor holding
brake function.
There are two digital outputs to choose from, for example, the motor holding brake can be
connected to the converter using digital output 0 (DO 0) on terminals 19 and 20.
The converter supplies the control for the motor holding brake.
214
Parameter
Description
Braking power of the braking resistor (factory setting: 0 kW)
Set the maximum braking power that the braking resistor must handle in your particular
application.
Under certain circumstances, for low braking power ratings, the converter extends the
ramp-down time of the motor.
Example: In your particular application, the motor brakes every 10 seconds. In so doing,
the braking resistor must handle a braking power of 1 kW for 2 s. Use a braking resistor
with a continuous power rating of 1 kW × 2 s / 10 s = 0.2 kW and set the maximum
braking power to: p0219 = 1 (kW).
No coast down/coast down (OFF2) signal source 1
p0840 = 722.x Monitor the overtemperature of the braking resistor with digital input x
of the converter.
SINAMICS G120C frequency converter
Operating Instructions, 03/2012, FW V4.5, A5E02999804B AB