Siemens S120 - S1 Threshold Switch

DC link components
5.2 Chassis
AC Drive
198 Manual, (GH6), 04/2014, 6SL3097-4AL00-0BP4
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.
WARNING
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
link capacitors are discharged.
Table 5- 10 Response thresholds of the Braking Modules
Response threshold
Switch position
Comment
673 V
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
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%.
774 V 2
Note
The threshold switches of the Braking Modules are in the following positions when installed:
•
Position "1" is up
•
Position "2" is down