Siemens Sinamics S120 Manual page 724

Cabinet design and EMC Booksize
12.7 24 V DC supply voltage
Figure 12-21 Connection example: Overvoltage protection components from Weidmüller connected to SINAMICS
components
*1 Terminals 11, 12, 14 of the "PU III 24 VAC/DC" are isolated monitoring contacts (11 C, 12
NC, 14 NO). In the case of a thermal overload of the varistor installed, contacts 11-12 are
opened and contacts 11-14 are closed.
724
Booksize Power Units
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6