S1 Threshold Switch - Siemens S120 Manual

DC link components
5.2 Chassis
5.2.1.8

S1 Threshold switch

The response threshold at which the Braking Module is activated and the DC-link voltage
generated during braking are specified in the following table.
Danger to life due to electric shock when operating threshold switches
Operating the threshold switch when a voltage is present will cause death or serious injury.
• Only operate the threshold switch when the Power Module is switched off and the DC
Table 5- 10 Response thresholds of the Braking Modules
Response threshold Switch position
673 V
774 V
Note
The threshold switches of the Braking Modules are in the following positions when installed:
• Position "1" is up
• Position "2" is down
198
WARNING
link capacitors are discharged.
Comment
1 774 V is the default factory setting. For line supply voltages of between 3-ph.
380 V and 400 V AC, the response threshold can be set to 673 V to reduce
2
the voltage stress on the motor and Power Module. This does, however,
reduce the possible braking power with the square of the voltage (673/774)² =
0.75.
The maximum possible braking power is, therefore, 75%.
Manual, (GH6), 04/2014, 6SL3097-4AL00-0BP4
AC Drive