Electrical installation
4.10 Other connections
Converter cabinet units
138
Operating Instructions, 07/2016, A5E03347396A
Duty cycles
Figure 4-25 Duty cycles for the braking resistors
4.10.11.3
Threshold switch
The response threshold at which the braking unit is activated and the DC link voltage
generated during braking are specified in the following table.
WARNING
Danger to life due to electric shock when operating threshold switches
Operating the threshold switch when a voltage is present can cause death or serious injury.
•
Only operate the threshold switch when the cabinet unit is switched off and the DC link
capacitors are discharged.
Table 4- 39 Response thresholds of the braking units
Rated voltage Response
threshold
Switch
position
Comment
3 AC 660 ...
690 V
1070 V
1
1158 V is the default factory setting. With a supply volt-
age of 660 V 3 AC, the response threshold can be set to
1070 V to reduce the voltage stress on the motor and
converter. This does, however, reduce the possible brak-
ing power with the square of the voltage (1070/1158)² =
0.85.
Therefore, the maximum possible braking power is 85 %.
1158 V
2
Summary of Contents for SINAMICS G150
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