Overvoltage Protection; Fig. 9 Pe Power Contact - Beckhoff EK1914 Operating Manual

Installation
PE power contact
The power contact labelled PE can be used as a protective earth. For safety reasons this contact mates first
when plugging together, and can ground short-circuit currents of up to 125 A.
Fig. 9: PE power contact
Serious risk of injury
Never use the PE power contact for other potentials.
Disconnect PE supply line for insulation test
For insulation testing disconnect the PE feed line at the EtherCAT coupler or the power terminal. In order to
decouple further supply points for the test, you can unlock these supply terminals and pull them at least 10
mm out of the interconnection of the other terminals.
Note that for EMC reasons the PE contacts are capacitively connected to the mounting rail. This can lead to
incorrect results during insulation testing and also to damage to the TwinSAFE component.
7.4.2

Overvoltage protection

Provide a surge filter against overvoltage for the supply voltage of the Bus Terminal block and the TwinSAFE
components, if protection against overvoltages is required in your system.
30
DANGER
CAUTION
Version: 2.0.0 EK1914