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Requests at Installation Section 2-3
2-3 Requests at Installation
2-3-1 To Ensure Prolonged Use
Use the temperature in the following operating environment:
Temperature: –10 to +55
°C (icing and condensation not allowed)
Humidity: 25 to 85%
When the temperature controller is incorporated in a control panel, make sure
that the controller’s ambient temperature and not the panel’s ambient temper-
ature does not exceed 55
°C.
The life of electronic equipment such as temperature controllers is influenced
not only by the life determined by the relay switching count but also by the life
of the electronic components used internally. The service life of components
is dependent on the ambient temperature: the higher the ambient temperature
becomes, the shorter the service life becomes, and vice versa. For this rea-
son, the service life of the temperature controller can be extended by lowering
its internal temperature.
Gang-mounting two or more temperature controllers, or mounting tempera-
ture controllers above each other may cause heat to build up inside the tem-
perature controllers, which will shorten their service life. When mounting
temperature controllers like this, forced cooling measures such as a cooling
fan for cooling the temperature controllers must be taken into consideration.
Prevent only the terminal block from being cooled. Otherwise, this may result
in a measurement error.
2-3-2 To Reduce the Influence of Noise
To reduce induction noise, the leads on the temperature controller’s terminal
block must be wired separately from large-voltage/large-current power leads.
Also, avoid wiring leads in parallel with power leads or in the same wiring
path. Other methods such as separating conduits and wiring ducts, or using
shield wire are also effective.
Attach a surge absorber or noise filter to peripheral equipment that generates
noise (in particular, motors, transformers, solenoids, or other equipment that
has a magnetic coil or other inductance component).
When a noise filter is used at the power supply, first check the voltage or cur-
rent, and attach the noise filter as close as possible to the temperature con-
troller.
Also, install the temperature controller as far away as possible from equipment
that generates strong, high frequency (e.g. high-frequency welders, high-fre-
quency sewing machines) or surges.
2-3-3 To Ensure High-precision Measurement
When the thermocouple leads are extended, be sure to use a compensating
lead wire matched to the type of thermocouple.
When the platinum resistance detector leads are extended, use the lead hav-
ing the smallest resistance to equalize the resistance of the three leads.
Install the temperature controller so that it is horizontal.
If there is a large error in the measurement values, make sure that input com-
pensation has been set correctly.
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