Siemens SINAMICS MV, Function Manual

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A.2.2 Wiring to the PSAs in the power unit
1. Initiate an external firing pulse inhibit using the connected trigger element. LED "2/OUT"
flashes green/yellow.
After the set delay time t = 0.5 s has elapsed, the safety relay LEDs indicate state "Device ready
for operation, all outputs inactive".
LED Status
1/device Green
2/Out Off
3/IN Off
4/SF Off
2. Withdraw the external firing pulse inhibit. The LEDs should again indicate state "Device ready,
all outputs active".
LED Status
1/device Green
2/Out Green
3/IN Green
4/SF Off
If a fault has occurred in the feedback circuit "Feedback" (input INF at the safety relay), then
the LED display signals fault "Device ready, feedback signal fault".
LED Status
1/device Green
2/Out Green flashing
3/IN Green
4/SF Red flashing
The LEDs indicate that when withdrawing/deactivating the external firing pulse inhibit
(sensor circuits IN1 and IN2 are activated), the feedback circuit at the safety relay was not
closed. The safety-related outputs of the safety relay can only be activated if the feedback
circuit is closed.
Wiring
A.2 Checking the wiring when the function is retrofitted
Two-channel firing pulse inhibit
Function Manual, 07/2021, A5E51227986A
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