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CHAPTER 4 INSTALLATION AND WIRING
4
4.8 Wiring
4.8.1 Wiring power supplies
4.8 Wiring
4.8.1 Wiring power supplies
(1) Precautions for wiring power supplies
• Wire cables of the programmable controller power supply, I/O power supply, and motor power supply
separately as shown below.
• If there is much noise, such as lightning surge, connect an isolation transformer.
For details on the isolation transformer, refer to the following.
Page 651, Appendix 8.1
• Taking rated current or inrush current into consideration when wiring the power supply, connect a breaker or
an external fuse that have proper blown and detection.
When using a single programmable controller, a 10A breaker or an external fuse are recommended for
wiring protection.
• Do not connect the 24VDC outputs of two or more power supply modules in parallel to supply power to one
I/O module. Parallel connection will damage the power supply modules.
• 100VAC, 200VAC and 24VDC wires must be twisted as dense as possible.
Connect the modules with the shortest distance.
Also, to reduce the voltage drop to the minimum, use the thickest wires possible (maximum 2mm
2
).
• Do not bundle the 100VAC and 24VDC wires with, or run them close to, the main circuit (high voltage, large
current) and I/O signal lines (including common line). Reserve a distance of at least 100mm from adjacent
wires.
100VAC
200VAC
T1
Main
power supply
Relay
terminal block
I/O power supply
I/O equipment
Inside a control panel
Programmable
controller power
supply
Isolation
transformer
Programmable
controller
Motor power supply
Motor equipment
Power supply module I/O module
24VDC
24VDC
Power supply module I/O module
24VDC
External power supply
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