Electrical installation
4.9 Other connections
Inverter cabinet units
120
Operating Instructions, 12/2014, A5E32923362A
Duty cycles
Figure 4-25 Duty cycles for the braking resistors
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
Switch
position
Comment
380 ... 480 V
770 V
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
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%.
670 V
2
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