Mitsubishi Electric QS001CPU User Manual page 94

Qscpu series safety programmable controller melsec-qs series
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10
LOADING AND INSTALLATION
(1) Power supply wiring
10
- 20
10.3 Wiring
10.3.1 Wiring precautions
• Separate the programmable controller power supply line from the lines for I/O
devices and power devices as shown below.
When there is much noise, connect an insulation transformer.
• Taking rated current or inrush current into consideration when wiring the power
supply, be sure to 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.
Main
power supply
200VAC
Relay
terminal block
On a control panel
Figure 10.21 Power supply connection diagram
• 100VAC and 200VAC wires should 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
2
(maximum 2mm
).
• Do not bundle the 100VAC and 200VAC 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 100 mm from adjacent wires.
• Momentary power failure may be detected or the CPU module may be reset due
to serge caused by lightning.
As measures against serge caused by lightning, connect a surge absorber for
lightning as shown in Figure 10.22.
Using the surge absorber for lightning can reduce the influence of lightning.
AC
E1
Figure 10.22 Connecting a lightning surge absorber
Programmable
Insulation
controller
Transformer
power supply
T1
I/O power supply
Main circuit
power supply
Programmable
controller
I/O devices
E2
Surge absorber for lightning
Programmable
controller
I/O equipment
Main circuit equipment

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