Overvoltage Protection - Siemens Sinamics S120 Manual

12.7.4

Overvoltage protection

Overvoltage protection devices are needed if long cables are used.
● Supply cables > 10 m
● Signal cables > 30 m
The following Weidmüller overvoltage protectors are recommended for protecting the
components' 24 V power supply and the 24 V signal cables from overvoltage:
Table 12- 7
DC power supply
Weidmüller
Item No.: PU III R 24V
Order number: 8860360000
The overvoltage protection components must always be placed next to the area to be
protected, e.g. at the entry point to the control cabinet. All 24 V cables which exit the
protected area must be routed through an overvoltage protection element.
The diagram below uses a CU320-2 DP as an example to show how the overvoltage
protection components are connected.
Booksize Power Units
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6
Recommendations for overvoltage protection
Cabinet design and EMC Booksize
12.7 24 V DC supply voltage
24 V signal cables
Weidmüller
Item No.: MCZ OVP TAZ
Order number: 844915 0000
723