Instruction manual

3
1. Installation precautions
Caution
This instrument is intended to be used under the following environmental
conditions (IEC61010-1): Overvoltage category , Pollution degree 2
Ensure the mounting location corresponds to the following conditions:
• A minimum of dust, and an absence of corrosive gases
• No flammable, explosive gases
• Few mechanical vibrations or shocks
• No exposure to direct sunlight, an ambient temperature of 0 to 50 (32 to 122 )
that does not change rapidly, and no icing
• An ambient non-condensing humidity of 35 to 85%RH
• No large capacity electromagnetic switches or cables through which large current is flowing
• No water, oil or chemicals or where the vapors of these substances can come into
direct contact with the unit
• Take note that ambient temperature of this unit must not exceed 50 (122 ) if mounted
through the control panel. Otherwise the life of electronic components (especially
electrolytic capacitors) may be shortened.
Note: Although the case of this instrument is made of flame-resistant resin, do not install
this instrument on or near flammable material.
2. Wiring precautions
Caution
• Use a solderless terminal with an insulation sleeve in which the M3 screw fits when
wiring the PCD-33A.
• The terminal block of this instrument 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) within the specified torque.
If excessive force is applied to the screw when tightening, the screw (M3) or case may
be damaged.
• Do not apply a commercial power source to the sensor which is 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.
• This controller has no built-in power switch or fuse. It is necessary to install them near
the controller.
(Recommended fuse: Time-lag fuse, Rated voltage 250V AC, Rated current 2A)
• For a 24V AC/DC power source, do not confuse polarity when using direct current (DC).
3.Operation and maintenance precautions
Warning
• It is recommended to perform auto-tuning during trial run.
• Do not touch live terminals. This may cause electric shock or problems in operation.
• Turn the power supply to the instrument OFF before retightening the terminal.
Working on or touching the terminal with the power switched ON may result in severe
injury or death due to Electric Shock.
• Be sure to turn the power to the PCD-33A OFF before cleaning.
• Use a soft, dry cloth when cleaning the instrument.
(Alcohol based substances may tarnish or deface the unit.)
• As the display section is vulnerable, do not strike or scratch it with a hard object or press
hard on it.