Brochure/Catalogue

Installation advice for instrumentation and control engineering
Installation advice for instrumentation and control engineering
The supply and earth lines to protective modules should
be kept short in order to achieve optimum protection for
equipment.
The fuses for the protective modules should be chosen
depending on the rated current as well as on the type of line
and its route.
Installation position
The protective modules are frequently installed at both ends
of the line.
It is important to ensure that protected and unprotected
lines are routed separately. In addition, there must be some
distance between power lines and data lines. A common
cable duct should be connected with metal partitions.
The protective modules should be mounted in a panel near
the entry point of the lines. Unprotected lines should not be
fed into parts of the system. Therefore, the lower level in the
panel should be used for the protective modules.
Mounting rail contact as earth in connection
for MCZ OVP
Contact to the rail is automatically established using the
snap-on attachment. The TS35 rail must be earthed in order
to ensure safe power discharging via the surge protection
elements of up to 20 kA (8/20 µs) and 2.5 kA (10/350 µs).
The DIN rail should be screwed onto the earthed mounting
plate to ensure EMC. It is also possible to contact the PE
every 60 cm / 24 inch using the tension-clamp terminal on
the MCZ OVP.
The shielded signal lines should be connected to PE via
terminal clamps (Weidmüller KLBÜ). Unshielded lines should
be twisted. Neutral earthing is preferred. All the protective
modules belonging to one part of the system should have
neutral earthing. A through-connection of the earth line
should be avoided.
Protected and unprotected lines must be laid separately.
A common cable duct should be connected with metal
partitions.
Likewise, signal and power lines should be laid separately.
Electrical isolation, e.g. with relay couplers or analogue
converters, should be employed for installations involving
several buildings. This avoids interference currents via minus,
PE or N.
The supply and earth lines to protective modules should
be kept short in order to achieve optimum protection for
equipment. Transmission paths should also be kept as short
as possible because the longer the line, the greater is the
chance that interference can affect the line. The inclusion of
surge protection also increases the attenuation of the line
and therefore changes the signal-to-noise ratio.
B
B.124 2028840000
Lightning and surge protection for control and instrumentation signals