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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 differen-
tials among three wires.
•
Keep input lines away from power line and load line to avoid the influence 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 filter are recommended.
(example: ZMB22R5-11 Noise Filter manufactured by TDK)
Make sure that the noise filter is installed to a place such as a panel that is properly grounded. The
wiring between the noise filter output terminal and the instrument power supply terminal should be
made as short as possible. None of fuses or switches should be installed to the wiring on the noise
filter output side because the filter 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,
•
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.
Example)
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 deter-
gent for wiping the controller.
SSR/SSC: one second or more
1
7
13
2
8
14
3
9
15
4
10
16
5
11
17
6
12
18
Z-Trap connection
– 8 –
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