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

4.2.1.7

X21 digital inputs/outputs

Table 4-6 Terminal block X21
Terminal
6
5
4
3
2
1
Max. cross-section that can be connected 1.5 mm
1) DI: Digital input; DO: Digital output
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.
Warning
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
774 V
673 V
Equipment Manual AC Drive
Manual, (GH6), 03/2006 Edition, 6SL3097-2AL00-0BP0
Designation Technical specifications
1)
+24 V Voltage: +18 V to 30 V
Typical current consumption (own current consumption): 10 mA at 24 V DC
DO fault output Voltage: 24 V DC
Load current: 0.5 mA to 0.6 mA
0 V
DI inhibit input High signal level: +15 V to 30 V
Current drain: 2 mA to 15 mA
0 V
Low signal level: -3 V to 5 V
Shield Shield connection for terminal 2 ... 6
2
Comment
1 774 V is the default factory setting. With supply voltages of between
3-ph. 380 V and 400 V AC, the response threshold can be set to 673 V to
2
reduce the voltage stress on the motor and converter. This does, however,
reduce the possible peak power P15 with the square of the voltage
(677/774)² = 0.75.
The possible peak power is, therefore, max. 75 % of P15.
DC link components
4.2 Chassis
4-13