20
Wiring Power to the Controller
• Be sure to use the rated power supply voltage and polarity for the unit
to protect it against damage and failure.
• Keep the power off until all of the wiring is completed to prevent
electric shock and abnormal operation.
• Keep the power supply wires separated from the input and output
wires.
• Power connections should be made with 18-gauge or larger insulated
wire. Stranded wire improves noise immunity. Noise filters and isola-
tion transformers are recommended in case of noisy power lines.
• When the Heater Burnout option is selected, use the same power line
for both the controller and the heater.
Wiring Inputs
There are two input categories available: Thermocouple/RTD or
current/voltage. Make sure you have the right type before wiring the
inputs. Refer to Table of Input Type Codes and set the parameter
“P-n2” accordingly.
Note: In order to minimize the risk of high frequency noise induced by
coils and windings in relays, solenoids, and transformers, use leads
which have braided shield and ground one end of the sheath. Keep
your input leads separate from power and output leads. If you have to
bring the input signal from a long distance, a signal transmitter might be
needed to maintain an accurate reading; in this case, a unit that
accepts current/voltage input would be necessary.
Thermocouple
• Connect thermocouples directly to the input terminals whenever
possible.
