Threshold Switch - Siemens Sinamics G120P Operating Instructions Manual

Electrical installation
4.9 Other connections
Duty cycles
Figure 4-25
4.9.11.3

Threshold switch

The response threshold at which the Braking Module is activated and the DC-link voltage
generated during braking are specified in the following table.
Table 4- 47 Response thresholds of the Braking Module
Rated voltage Response
threshold
380 ... 480 V 770 V
670 V
120
Duty cycles for the braking resistors
Switch
position
1 770 V is the delivery condition setting. With line voltages of between 380 V
and 400 V, the response threshold can be set to 670 V to reduce the voltage
2
stress on the motor and drive. This does, however, reduce the possible brak-
ing power with the square of the voltage (670/770)² = 0.75.
The maximum possible braking power is therefore 75%.
Comment
Operating Instructions, 12/2014, A5E32923362A
Inverter cabinet units