Electrical installation
4.9 Additional connections
Enclosed Drives
138
Operating Instructions, 12/2018, A5E36652151A
WARNING
Electric shock when operating the threshold switch
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- 43 Response thresholds of the braking units
Rated voltage Response
threshold
Switch
position
Comments
380 ... 480 V
AC 3-ph.
673 V
1
774 V is the factory setting. For line voltages of 3-phase
380 ... 400 V AC, the response threshold can be set to
673 V to reduce the voltage stress on the motor and
converter. However, the possible braking power declines
with the square of the voltage (673/774)² = 0.75.
The maximum available braking power is therefore 75%.
774 V
2
500 ... 600 V
AC 3-ph.
841 V
1
967 V is the factory setting. With a supply voltage of
3-phase 500 V AC, the response threshold can be set to
841 V to reduce the voltage stress on the motor and
converter . However, the possible braking power declines
with the square of the voltage (841/967)² = 0.75.
The maximum available braking power is therefore 75%.
967 V
2
3-phase 660 ...
690 V AC
1070 V
1
1158 V is the factory setting. With a line voltage of
3-phase 660 V AC, the response threshold can be set to
1070 V to reduce the voltage stress on the motor and
converter. However, the possible braking power declines
with the square of the voltage (1070/1158)² = 0.85.
The maximum possible braking power is therefore 85%.
1158 V
2
Summary of Contents for SINAMICS S150 NEMA
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