4.1 Designs
The P634 is available in a surface-mounted and a flush-mounted case. Depending
on the connection type – pin-terminal or ring-terminal connection – the case sizes
differ. The location diagrams (Section 5.7, (p. 5-22)) show the available
combinations of case widths and connection types.
Electrical connections are made via plug-in threaded terminal blocks. The
threaded terminal blocks in the surface-mounted case are accessible from the
front of the device after unscrewing the torx head steal screws on the sides (see
Fig. 4-1, (p. 4-3), ➀) and removing the local control panel. The local control
panel can then be secured by inserting the tabs in the slots in the left side wall
(see Fig. 4-1, (p. 4-3), ➁). The flush-mounted case is connected at the back of
the case.
WARNING
The local control panel is connected to processor module P by a plug-in
connecting cable. Do not bend the connecting cable! Secure the local control
panel by inserting it in the slots provided on the left.
WARNING
The secondary circuit of live system current transformers must not be
opened! If the secondary circuit of a live CT is opened, there is the danger
that the resulting voltages will endanger personnel and damage the
insulation.
WARNING
For pin-terminal connection devices, the terminal block for system current
transformer connection is not a shorting block! Therefore always short-circuit
the system current transformers before loosening the threaded terminals.
P634 4 Design
4-2 P634/EN M/R-42-A // P634‑311‑653
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