Electrical installation
4.9 Other connections
Drive converter cabinet units
Operating Instructions, 07/07, A5E00288214A
85
Table 4-33 Response thresholds of the braking units
Rated voltage Response
threshold
Switch
position
Remark
673 V 1 380 V - 480 V
774 V 2
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
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%.
841 V 1 500 V – 600 V
967 V 2
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
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%.
1070 V 1 660 V - 690 V
1158 V 2
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
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 %.
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