IMO Precision Controls K7 Series, Руководство пользователя

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Chapter 9 Installation and Wiring
9- ేె
9.2.2 Input and Output Devices Wiring
1)Applicable size of wire to the terminal block connector is 0.18 to 2 ㎟ . However, it is recommended to use
wire of 0.3 ㎟ for convenience.
2) Separate the input and output lines.
3) I/O signal wires must be at least 100
㎜
(3.94 in) away from high voltage and large current circuit wires.
4) When the I/O signal wires cannot be separated from the main circuit wires and power wires, ground on the PLC side
with batch-shielded cables. Under some conditions it may be preferable to ground on the other side.
5) If wiring has been done with of piping, ground the piping.
6) Separate the 24VDC I/O cables from the 110VAC and 220VAC cables.
7) If wiring over 200 ᎖ ( 7.88 in ) or longer distance, trouble can be caused by leakage currents due to line capacity.
Refer to the section 11.4 Example.
9.2.3 Grounding
1)This PLC has sufficient protection against noise, so it can be used without grounding
except for special much noise. However, when grounding it should be done conforming to below items
.
2)Ground the PLC as independently as possible. Class 3 grounding should be used
(grounding resistance 80 ᆅ or less).
3)When independent grounding is impossible, use the joint grounding method as shown in the figure below (B).
(A)Independent grounding : Best (B) Joint grounding : Good (C) Joint grounding : Not allowed
4)Use 2 ᎙ (14AWG) or thicker grounding wire. Grounding point should be as near as possible to the PLC
to minimize the distance of grounding cable.
Input
PLC
Shield cable
RA
DC
PLC
Other device
PLC PLC
Other device
Class 3 grounding
Class 3 grounding
Other device