6
Caution
<Precautions for installation and wiring work>
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A qualified electrician must install and wire this unit properly for safety.
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Secure a space of 100 mm or more around this unit in all directions (except the back side).
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Take care not to enter any foreign objects such as chips or wire pieces into this unit when tapping or wiring.
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Check the connection diagram thoroughly for wiring. Wrong wiring can cause a product failure, a fire, or an electric
shock.
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In order to prevent the invasion of noise, the transmission signal lines and output signal lines
must not be placed close
to or bound together with the power lines or high voltage lines
. When lying parallel to the power lines or high
voltage lines, refer to the following table for the separation distance. (except the input part of the terminal block)
Conditions
Distance
Power lines of 600 V or less
300 mm or more
Other power lines
600 mm or more
*When there is concern about the invasion of noise, it is recommended to use shielded cables for the wiring with the
above separation distance.
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Place the wires connected to this unit in a duct or fixed them with clamps. Otherwise, cable dangling/movement or
unnecessary careless tension can cause damage to the unit and/or wires, or a poor connection of the wire can cause a
product malfunction.
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<Connection to the terminal block>
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Strip the wires by appropriate length. If the stripping length is too long, it could cause short-circuit with the adjacent
wire. On the other hand, if it is too short, it could cause a contact failure due to the bad fitting.
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Take care not to cause a short circuit of the adjacent electrodes due to the filaments.
(Do not perform solder plating of the cable core.)
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Do not connect three wires or more to one of the terminal block. Otherwise, the connection could get loose, resulting
in that the wires might come off.
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Use appropriate size wires. If an inappropriate size wire is used, it could cause a fire due to generated heat.
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Tighten the screws with a specified torque. Insufficient tightening could cause a drop, short-circuit, or a malfunction
while over-tightening could damage the screws and/or unit, resulting in a drop, short-circuit, or a malfunction.
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After tightening the screws, be sure to confirm all the screws tightened. Forgetting to tighten the screws could cause
a product malfunction, a fire, or an electric shock.
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Be sure to attach the terminal cover and close it to prevent an electric shock.
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Use crimp-type terminals appropriate for the size of electric wires. If an inappropriate crimp-type terminal is used, it
could result in a malfunction/failure/burnout of the unit or a fire caused by a wire breakage or a contact failure.
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Be sure to ground the frame grounding (FG) terminal with Class D grounding. The ground resistance is 100 Ω or less.
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When disconnecting the wires from this unit, do not pull them with a strong force. If you pull them connected to the
unit, a malfunction or damage to the unit and/or wires could be caused.
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Do not directly touch any conductive parts or electrical circuits of this unit. Otherwise, there is danger of an electric
shock or a failure/malfunction of the unit.
<Connection of the frame grounding (FG) terminal>
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When this unit is subjected to an insulation resistance test or a commercial frequency withstand voltage test, perform
the test within the specified voltage.
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For actual use, ground the frame grounding (FG) terminal. (Type D grounding: Type 3 grounding)
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To protect persons with little knowledge about electrical equipment from electric shock, either of the following
measures must be taken against the panel:
Lock the panel so that only those who have gotten an education about electrical equipment and have the
sufficient knowledge can unlock it, or construct a structure that shuts off the power supply automatically by
opening the panel.
Cover the dangerous voltage part of this unit with a cover.
