Siemens 7XT71 Series, Manual

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7XT7100-0*A00/DD English
C53000-B119U-C128-1 7
Installation Hints
Secure the unit with four screws to the panel. Verify sufficient space to adjacent relays in
case of model -*B***. Refer to Figures 6 and 7 for dimensions and connection hints.
Make a solid low-resistance and low-inductance earth connection between the earthing
surface at the side or rear wall of the unit using at least one standard screw M4, and the
earthing continuity system of the panel or cubicle.
Make connections via the screwed or snap-in terminals. Observe labelling of the individual
terminals to ensure correct location. Observe the max. permissible conductor cross-sections
and torque values as well as the bending radius. Use copper conductors only! The use of
the screwed terminals is recommended; snap-in connection (on models for panel flush
mounting or cubicle installation) requires special tools and must not be used for field wiring
unless proper strain relief is ensured. Refer to Figures 6 and 7 for connection hints.
For screwed terminals, ring cable lugs type PIDG of Messrs. Tyco Electronics AMP are
recommended.
The screwed terminals of models for panel surface mounting can be connected without ring
cable lugs. The use of flexible wires requires end sleeves.
Caution!
The printed circuit boards of numerical relays contain CMOS circuits.
These shall not be withdrawn or inserted under live conditions! The
modules must be so handled that any possibility of damage due to static
electrical charges is excluded. During any necessary handling of
individual modules the recommendations relating to the handling of
e lectrostatically e ndangered c omponents (EEC) must be observed.
In installed conditions, the modules are in no danger.