Siemens SINAMICS S150 Operating Instructions Manual page 85

Table 4-33 Response thresholds of the braking units
Rated voltage Response
threshold
380 V - 480 V 673 V
774 V
500 V – 600 V 841 V
967 V
660 V - 690 V 1070 V
1158 V
Drive converter cabinet units
Operating Instructions, 07/07, A5E00288214A
Switch
position
1 774 V is the default factory setting. With supply voltages of between 380 V
and 400 V, the response threshold can be set to 673 V to reduce the voltage
2
stress on the motor and converter. This does, however, reduce the possible
braking power with the square of the voltage (677/774)² = 0.75.
The maximum possible braking power is, therefore, 75%.
1 967 V is the default factory setting. With a supply voltage of 500 V, the
response threshold can be set to 841 V to reduce the voltage stress on the
2
motor and converter. This does, however, reduce the possible braking power
with the square of the voltage (841/967)² = 0.75.
The maximum possible braking power is, therefore, 75%.
1 1158 V is the default factory setting. With a supply voltage of 660 V, the
response threshold can be set to 1070 V to reduce the voltage stress on the
2
motor and converter. This does, however, reduce the possible braking power
with the square of the voltage (1070/1158)² = 0,85.
The maximum possible braking power is, therefore, 85 %.
Electrical installation
4.9 Other connections
Remark
85