X21 Digital Inputs/Outputs; S1 Threshold Value Switch - Siemens SINAMICS S120 Manual

DC Link Components
4.2 Chassis
4.2.1.7

X21 digital inputs/outputs

Table 4-6 Terminal block X21
Terminal
1
2
3
4
5
6
Max. connectable cross-section 1.5 mm
DI: Digital input; DO: Digital output
1)
Note
Applying a high signal to terminal X21.3 inhibits the Braking Module. On a falling edge,
pending error signals are acknowledged.
4.2.1.8

S1 threshold value 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.
The threshold switch must only be used when the Power Module is switched off and the DC
link capacitors are discharged.
Table 4-7 Response thresholds of the Braking Modules
Response threshold Switch position
673 V
774 V
130
Designation
1)
Shield
0 V
DI inhibit input
0 V
DO fault output
+24 V
2
WARNING
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 (677/774)² =
0.75.
The maximum possible braking power is, therefore, 75%.
Technical specifications
Shield connection for terminal 2 ... 6
Low signal level: -3 V to 5 V
High signal level: +15 V to 30 V
Current drain: 2 mA to 15 mA
Voltage: 24 V DC
Load current: 0.5 mA to 0.6 mA
Voltage: +18 V to 30 V
Typical current consumption (own current consumption): 10 mA at
24 V DC
Manual, (GH6), 07/2007 Edition, 6SL3097-2AL00-0BP2
AC Drive