Siemens SINAMICS G120 Function Manual page 164

Operation
6.2 Regularly testing the safety functions
Performing a forced dormant error detection (test stop)
When testing the extended functions, the inverter switches the motor into a no-torque
condition.
Preconditions
● STO is not active.
If you start the forced dormant error detection with STO active, then the inverter responds
with a fault.
● The motor is switched on (ON/OFF1 = 1), and is at a standstill (speed setpoint = 0).
Procedure
To start the forced dormant error detection of the extended functions, proceed as follows:
1. Start the forced dormant error detection using a signal of your choice, for example a
digital input.
2. The inverter checks its safety-related circuits. During the check, the inverter outputs
alarms C01798 and C30798. This check takes several milliseconds.
3. Set the signal to start the forced dormant error detection to zero.
4. Check that neither alarm A01699 nor alarm A01697 is active.
5. Check the safety inputs of the inverter, also see: Testing safety inputs (Page 161).
6. Check the safety output of the inverter, also see: Testing a safety output (Page 165).
You have performed the forced dormant error detection of the extended functions.
164
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Function Manual, 04/2014, FW V4.7, A5E34261271B AA