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12A4A4-00023E-5
■Wiring Procedures
Wire the power cables as instructed below.
(1) Make sure power is not conducting.
(2) Loosen the screw clamp on the connector.
(3) Strip the cable; twist the core wire and insert to connection.
(4) Tighten the screw clamp and fix the wire.
(5) Connect the connector to interface of unit.
(6) Tighten mounting screw and fix to unit.
9-2
Cautions for Power Supply Wiring
(1) Wire the power source, input/output device, and power device of the EMG7 isolating each by sequence.
(2) Do not bundle main circuit (High voltage, high current) wires, signal wires, and power cables, nor put them
close to each other.
(3) Twist the power cable as short as possible to improve noise immunity.
(4) If there are any noise effects, attach a ferrite core to the power cable.
(5) A Safety Extra Low Voltage (SELV) and Limited Energy Circuit or SELV and Class 2 dc power supply.
(6) The user calculates proper gauge wiring for current carrying capacity and loss ccording to local regulations.
(7) Connect a lightening surge absorber for lightening surge measures.
(8) Separate lightening surge absorber connection (E1) and grounding of EMG7 (E2).
(9) Choose the lightening surge absorber so the power voltage maximum increase does not exceed the maximum
capacity voltage circuit of the lightening surge absorber.
9-3
Cautions for Grounding
(1) Have a dedicated grounding for power source cable FG. “Grounding construction is type D grounding,
grounding resistance is 100Ω or lower.”
(2) SG (Signal ground) and FG (Frame ground) is connected inside of EMG7. When connecting connection
apparatus and SG, design the system so there is no short circuiting loop.
(3) Use a grounding wire of 2mm
2
or more. Shorten the grounding wire distance near the grounding point of
EMG7. If the grounding wire is long, than use a large insulation wire when setting.
9-4
Caution for Wiring of Signal Lines
(1) Wire the signal wires in a different wiring sequence than the power cables and power circuits.
(2) If the power circuit cable cannot be wired in a different sequence, use a shield cable and ground the shield
terminal.
(3) If there are any noise effects, attach a ferrite core to the signal wire