Dynamic Brake - Siemens Sinamics G120 CU240E Operating Instructions Manual

Functions
5.10 Technological functions
5.10.1.2

Dynamic brake

Parameterizing the dynamic brake
An internal closed-loop chopper control (braking chopper) in the frequency inverter, which
can control an external braking resistor, is required for a dynamic brake
Dynamic braking converts the regenerative energy, which is released when the motor
brakes, into heat.
Figure 5-9
Parameter
P1237
If a braking resistor that is unsuitable is used, a fire could break out and severely damage
the converter.
The temperature of braking resistors increases during operation. For this reason, avoid
coming into direct contact with braking resistors. Make sure that the devices are located at
sufficient distances from each other and that proper ventilation is provided.
132
Braking chopper in the frequency inverter
Description
Enable signal and ON period of the dynamic brake
0: Dynamic brake is blocked
1: 5% ON period
2: 10% ON period
3: 20% ON period
4: 50% ON period
5: 100% ON period
The ON period set here is only effective if the braking resistor has reached its operating
temperature. When required, a cold braking resistor is switched-in independent of this
parameter
WARNING
Frequency inverter
Operating Instructions, 08.10. 2008, t.b.d.