Switch S41 - Siemens PM330 Hardware Installation Manual

4.6.2

Switch S41

Switch S41
The STO circuit is activated and/or deactivated using the two switches STO_A and STO_B.
The two switches must have the same switching state, both ON or both OFF. An unequal
switching state is an undefined state.
The switch positions for "STO OFF" and "STO ON" can be identified on the adhesive label in
the CU channel.
STO circuit deactivated
Both switches positioned towards the rear (STO OFF): STO circuit is deactivated.
Here, the STO inputs are deactivated by the two switches, and therefore STO deselected.
Inverter operation is possible independent of the signal states at the STO inputs.
● The inverter is supplied in this state.
● Compatibility state to previous versions (FS < 04) without STO
● Applications where STO is not used.
STO circuit deactivated
Both switches positioned to the front (STO ON): STO circuit is activated.
In this switch position, the inverter can only be operated when both STO inputs, STO_A and
STO_B have a high signal level. STO is initiated (wire-break-proof) by deactivating (low
signal level) one or both inputs.
Power Module PM330
Hardware Installation Manual, 12/2018, A5E32844552B AF
Connecting up, switching on
4.6 Terminal block X41 / switch S41
53