Beckhoff EL6900, Руководство по эксплуатации

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Operation
EL6900 24 Version: 2.2.0
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. 10: PE power contact
CAUTION
Insulation tests
Note that, for reasons of electromagnetic compatibility, the PE contacts are capacitatively
coupled to the mounting rail. This may lead to incorrect results during insulation testing or
to damage on the terminal (e.g. disruptive discharge to the PE line during insulation testing
of a consumer with a rated voltage of 230 V).
For insulation testing, disconnect the PE supply line at the Bus Coupler or the Power Feed
Terminal! In order to decouple further feed points for testing, these Power Feed Terminals
can be released and pulled at least 10 mm from the group of terminals.
DANGER
Serious risk of injury!
The PE power contact must not be used for other potentials!
4.2.4.2 Overvoltage protection
If protection against overvoltage is necessary in your plant, provide a surge filter for the voltage supply to the
Bus Terminal blocks and the TwinSAFE terminals.