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Connecting to the Network Section 3-6
!Caution Be sure to turn OFF the power supply to the PC before connecting to the
power supply terminal block.
Note 1. Do not connect a power supply with a voltage other than 24 VDC.
2. To reduce the effects of noise, wire the power supply cable separately from
power lines and high-voltage lines.
3. Crimp terminals must be used for wiring. Do not just twist loose wire
strands.
4. Use the recommended crimp terminals.
5. Use the proper tools and procedure for installing the crimp terminals. Con-
sult with the terminal manufacturers for instructions. If the proper tools and
procedure are not used, it may cause the cable to become disconnected.
6. When installing the crimp terminals, use a length of cable that will not need
to be bent too much when combined with the terminals. Also, cover the ter-
minal and the end of the cable with insulating tape and heat-absorbing tub-
ing.
7. Be careful not to mistake the plus and minus terminals when connecting
the power supply.
8. Tighten the terminal block screws to a torque of 0.5 N·m. If the screws are
too loose, it may result in short-circuiting, malfunctioning, or fire damage.
9. Check the wiring carefully before turning ON the power.
10. Use a dedicated power supply, and do not use the same power supply for
the I/O power supply, motor power lines, or control power lines.
11. Position the power supply as close as possible to the Unit, and separate
the power supply cable by at least 20 cm from other power lines in order to
avoid adverse effects from high-voltage lines.
12. Noise influence may be reduced by installing a noise filter near the primary
side of the power supply.
13. Carefully twist the power supply cable that is to be connected to the Unit.
14. Do not excessively bend or stretch the cable.
15. Do not place anything on top of cables or cords.
16. If errors occur due to noise related to an external power supply, it may be
possible to solve the problem by not grounding the communications power
supply. Normally the switching power supply is connected to the case and
capacitor, as shown in the following diagram, so along with isolating the FG
terminal it is necessary to insulate the power supply itself from the control
panel.
Maker Model Specifications Applicable power line
range (stranded wire)
J.S.T.MFG.CO.,
LTD
V1.25-N3A Fork terminal with
vinyl insulation
0.25 to 1.65 mm
2
(AWG: #22 to #16)
V1.25-MS3 Ring terminal with
vinyl insulation
MOLEX JAPAN
CO.,LTD
VSY1.25-3.5L Fork terminal with
vinyl insulation
0.3 to 1.65 mm
2
(AWG: #22 to #16)
RAV1.25-M3 Ring terminal with
vinyl insulation