Cabinet design and EMC Booksize
12.6 24 V DC supply voltage
Booksize Power Units
Manual, (GH2), 07/2016, 6SL3097-4AC00-0BP8
697
Surge arresters are required for cable lengths > 30 m.
The following Weidmüller surge arresters are recommended for protecting the 24 V power
supply of the components and the 24 V signal cables against overvoltage:
Table 12- 6 Recommendations for overvoltage protection
Weidmüller
Article: PU III R 24V
Weidmüller
Article: MCZ OVP TAZ
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.
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