S1 - Threshold Switch - Siemens SINAMICS S120 Device Manual

Options
8.34 L61/L62, L64/L65, braking units
Commissioning/configuration
If a Control Unit is not being used (option K90/K95), then the four signals of terminal block -
X55-X132 must be wired to the corresponding Control Unit or to the customer interface -X55.
8.34.3

S1 - Threshold switch

The response threshold at which the braking module is activated and the DC link voltage
generated during braking is specified in the following table.
Risk of death from electric shock when operating the threshold switch
Operating the threshold switch when a voltage is present can cause death or serious injury.
• Operate the threshold switch only when the Basic Line Module, Smart Line Module,
Table 8- 54
380 to 480 V 3
500 to 600 V 3
660 ... 690 V 3
464
WARNING
Active Line Module, or Motor Module are switched off and the DC link capacitors are
discharged.
Response thresholds of the braking modules
Voltage Response
threshold
673 V
ph. AC
774 V
841 V
ph. AC
967 V
1070 V
ph. AC
1158 V
Switch Comments
position
1 774 V is the default factory setting. For line voltages of
380 ... 400 V 3 ph. AC, the response threshold can be set
2
to 673 V to reduce the voltage stress on the motor and
converter. However, this reduces the possible braking
power to the square of the voltages (673/774)² = 0.75.
Therefore, the maximum available braking power is 75
%.
1 967 V is the default factory setting. With a line voltage of
500 V 3 ph. AC, the response threshold can be set to
2
841 V to reduce the voltage stress on the motor and
converter. However, this reduces the possible braking
power to the square of the voltages (841/967)² = 0.75.
Therefore, the maximum available braking power is 75
%.
1 1158 V is the default factory setting. With a line voltage of
660 V 3 ph. AC, the response threshold can be set to
2
1070 V to reduce the voltage stress on the motor and
converter. However, this reduces the possible braking
power to the square of the voltages (1070/1158)² = 0.85.
Therefore, the maximum available braking power is 85
%.
Cabinet Modules NEMA
Manual, 04/2014, A5E03586450A