Siemens 3TM, Руководство по эксплуатации

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Installation
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2020-09-18
Earthing
Connect the earthing conductor on the earthing terminal (22) to the high-voltage pro-
tective earth as specified (DIN EN 50341).
Connecting to earthing on
the customer’s premises
Mount the contact washer (SN 70093), ring cable lug of the earthing conductor and
washer with the hexagonal bolt M12 (see Fig. 29) on the earthing terminal (22) and
tighten to 105 Nm.
Connecting low voltage
Connect the low-voltage connecting cables on the customer side in the switch cab-
inet according to chapter “Circuit diagrams” on p. 27 so that secure operation is
guaranteed.
Wiring the auxiliary
switches
The auxiliary switches (23) are not wired in the as-delivered condition.
The connecting cables are to be mounted by the customer as a flexible flex. Cross-
sections can be found in the supplied data sheet (see also “Rated data for auxiliary
switches”, Fig. 17, p. 21).
Note
The base plate is provided with a protective layer. The earthing conductor must
be connected on the customer’s premises with the use of a contact washer:
• with spring steel serrations and
• mechanically galvanized.
Only in this way is the protective layer reliably penetrated to the metal and contact
established.
Note
If the vacuum contactor is installed into an earthed metal frame and is connected
so it is permanently electrically conductive, no separate earthing is required.
In this case, place contact washers (SN 70093) under the screw heads when fas-
tening the vacuum contactor.
Fig. 30 Auxiliary switch without wiring, as-delivered
condition Fig. 31 Removing the auxiliary switch