Mitsubishi Electric MELSEC iQ-R Series - Page 125

5 INSTALLATION AND WIRING
5.7 Wiring
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5
The following figure shows a wiring example of a redundant power supply system.
Use a power supply in a different system for each redundant power supply module (A or B, as shown below) so that the
redundant power supply modules are powered on or off individually at replacement.
• 100VAC, 200VAC and 24VDC wires must be twisted starting from the terminal connected, and connect
modules at the shortest distance. Also, use the thickest wire (maximum 2) to reduce the voltage drop.
• For the wiring to a terminal block, use a solderless terminal.
• To prevent the short-circuit because of loosening screws, use the solderless terminal with an insulation
sleeve of 0.8 mm or less. Note that up to two solderless terminals can be connected per terminal block.
• Ground the LG and FG terminals after short-circuiting them. Failure to do so may be susceptible to the
noise. The LG terminal has a half potential of the input voltage.
• When two redundant power supply modules operate in parallel as a redundant power supply system, it is
recommended to connect the one redundant power supply module to an uninterruptible power supply
(UPS).
• AC power supply
R64RPR64RP
FG
LG
INPUT
ERR
100-240VAC
R64RPR64RP
R04CPU
R610RB
R310RB
FG
LG
INPUT
ERR
100-240VAC
BA
AC
AC
AC
AC
100/200VAC
100/200VAC
100/200VAC
100/200VAC
Terminal block
Solderless terminal
with an insulation
sleeve