Instruction manual

10
4. Wiring
Warning
Turn the power supply to the instrument off before wiring or checking.
Working on or touching the terminal with the power switched on may result in
severe injury or death due to Electric Shock.
Moreover, the instrument must be grounded before the power supply to the
instrument is turned on.
Caution
• Do not leave wire remnants in the instrument, because they could cause a fire or
malfunction.
• For the ground terminal of the PCD-33A, use 2mm
2
or more of thick wire.
However, avoid grounding in conjunction with the power line.
• Use the solderless terminal with an insulation sleeve in which the M3 screw fits when
wiring the PCD-33A terminals.
• The terminal block of the PCD-33A is designed to be wired from the left side.
The lead wire must be inserted from the left side of the terminal, and fastened with
the terminal screw (M3).
• Tighten the terminal screw (M3) using the specified torque.
If the screw is tightened too hard, the screw or case may be damaged.
• Use a thermocouple, compensating lead wire and 3-wire system RTD according to
the input specification of this controller.
• In the case of 24V DC for power source, do not confuse polarity.
• With the relay contact output type, externally use an auxiliary electromagnetic switch
according to the capacity of the load to protect the built-in relay contact.
• When wiring, keep input wire (thermocouple, RTD, etc.) away from AC source and
load wire.
• This controller has neither a built-in power switch nor a fuse. Therefore, it is necessary
to install them in the circuit near the external controller.
(Recommended fuse: Time-lag fuse, rated voltage 250V AC, rated current 2A)
• Do not apply a commercial power source to the sensor connected to the input
terminal nor allow the power source to come into contact with the sensor, as the
input circuit may be burnt out.