–
8
–
2.3 Precautions in wiring connection
• For the thermocouple sensor type, use thermocouple compensation wires for wiring.
For the RTD type, use a wiring material with a small lead wire resistance and no resistance
differentials among three wires.
• Keep input lines away from power line and load line to avoid the inuence from noise induced.
• For the input and output signal lines, be sure to use shielded wires and keep them away from each
other.
• If a noise level is excessive in the power supply, the additional installation of an insulating
transformer and the use of a noise lter are recommended.
(Example: ZMB22R5-11 Noise Filter manufactured by TDK)
Make sure that the noise lter is installed to a place such as a panel that is properly grounded. The
wiring between the noise lter output terminal and theinstrument power supply terminal should be
made as short as possible. Noneof fuses or switches should be installed to the wiring on the noise
lter outputside because the lter effect will be degraded by such an installation.
• A better anti-noise effect can be expected by using stranded power supply cable for the instrument.
(The shorter the stranding pitch is, the better the anti-noise effect can be expected.)
• For the unit with an alarm against a failure (burn-out) in the heater, use the same power line for
connection of the power supplies for the heater and the controller.
• A setup time is required for the contact output when the power is turned on. If the contact output is
used as a signal for an external interlock circuit, use a delay relay at the same time.
• Use the auxiliary relay since the life is shortened if full capacity load is connected to the output
relay. SSR/SSC drive output type is preferred if the output operations occur frequently.
[Proportional interval] relay output: 30 seconds or more, SSR/SSC: one second or more
• If inductive load such as magnetic switches connected as a relay output load, it is recommended
to use Z-Trap manufactured by Fuji Electric to protect a contact from switching serge and keep a
longer life.
Model : ENC241D-05A (power supply voltage: 100 V)
ENC471D-05A (power supply voltage: 200 V)
Where to install : Connect it between contacts of the relay control output.
2.4 Requirement for key operation/operation in abnormalities
• Prior to the operation, be sure to check alarm functions, since a failure in the proper setting will
result in a failure in the proper output of an alarm in case of an abnormality.
• A display of UUUU or LLLL will appear in case of a break in the input. Be sure to turn off the power
when a sensor is replaced.
2.5 Others
• Do not use organic solvents such as alcohol and benzine to wipe this controller. Use a neutral
detergent for wiping the controller.
Example)
Z-Trap connection
10 11 12 13 14 15 16 17 18
1 2 3 4 5 6 7 8 9
• The SSR/SSC-driven output, an output of 4 to 20 mA DC and retransmission are not electrically
insulated from internal circuits.
Use a non-grounded sensor for resistance bulb or thermocouple.
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