Omega FUZZY LOGIC CN4800, Manual

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• CN4800
Insert the supplied mounting frame from the rear side and push it in
until the main unit is secured firmly to the panel. If it has a slight play,
tighten the 2 screws until the play is eliminated. (If the screws are tight-
ened forcedly, the mounting frame may be slipped off the stopper)
3) When the unit is exposed to water, it may lead to a short-circuit or fire
hazard. Contact your dealer for inspection.
2.2 Caution on cable connection
1) For thermocouple input, use a suitable compensating cable.
2) For resistance bulb input, use a cable with a small lead wire resistance and
without resistance difference between 3 wires.
3) When external wiring has much noise, use the following step. When a
conducted as load of digital output such as relay contact output or alarm
output, connect a surge absorber to the conductor coil. (Example:
1821-101)
4) When the power source has much noise, use an insulating transformer
together with a noise filter. Noise filter should be mounted on a panel which
has been earthed. The wiring between the noise filter output and the instru-
ment power terminals should be as short as possible. Do not connect a
fuse or switch to the noise filter output wiring, as it affects the performance
of the filter.
5) Use of a twisted cable for the instrument power source provides better ef-
fects (short twist pitch is effective for noise).
6) When a heater burnout alarm is provided, the heater power and controller
power should be connected using the same power line.
7) Time for preparation of contact output is required at power ON. When the
output signal is used for an external interlock circuit, etc., connect a delay
relay to the circuit.
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