wtw CL 298, Operating Manual

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Installation
pH 298, LF 298, Oxi 298, Cl 298
22
ba77196e03 07/2018
3.9 Electrical connections: General instructions
Cable glands All electric cables are fed from below via prepared openings in the enclosure of
the measuring transmitter. Cable glands are premounted for tightening pur-
poses between the cable and enclosure and for strain relief.
General instal-
lation instructions
Observe the following points when attaching connecting wires to the terminal
strip:
 Shorten all wires to be used to the length required for the installation
 Always fit all the ends of the wires with wire end sleeves before connecting
them to the terminal strip
 Any wires that are not used and project into the enclosure must be cut off as
closely as possible to the cable gland.
 Screw a small cable gland with sealing ring into each remaining free opening
and close it with a blind plug.
WARNING
No free wires are allowed to project into the housing. Otherwise, there is a
danger that areas safe to contact could come into contact with dangerous
voltages. This could result in life threatening electric shock when working
with the measuring transmitter. Always cut off any wires that are not in use
as closely as possible to the cable gland.
3.10 Connecting the voltage supply
The measuring transmitters are supplied without power connection cable. A
module in the lower instrument part preinstalled by the manufacturer enables
the cabling! The requirements of the power cable to be used for permanent
installation are given in the chapter Technical data. For permanent installation,
a power disconnecter / circuit fuse protection is additionally required. This fuse
protection should be no more than 10A (slow). The external circuit breaker must
be suitable according to IEC 60947-1 and EN 60947-3 and labeled for the instru-
ment.
The plugs may only be plugged into grounded power sockets. The ground
protection must not be eliminated by using extensions without protective earth
conductor. Any interruption of the protective earth conductor within or outside
the measuring transmitter can lead to the risk of fire or electric shock if another
error occurs. Check the power cable regularly. The power cable must be
replaced if it is damaged.
8 Close the enclosure.
9 Reinstall the cover on the left and right-hand side of the measuring
transmitter.