Wiring To The Power Supply Modules In A Redundant System - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

Wiring to the power supply modules in a redundant system

This section describes the wiring to the power supply modules.
The terminal block of each power supply module has a screw size of M4. Wire cables to the terminal block with the applicable
solderless terminal RAV1.25-4 or RAV2-4.
Separately supply power to the system A and B.
Wiring example
The following figure shows a wiring example of power cables to each main base unit and ground cables.
For wiring examples for each power supply module, refer to the manual included with the power supply module. ( Before
Using the Product)
A B
100/200VAC
AC
100/200VAC
AC
• 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 0.8mm or less. Note that up to two solderless terminals can be connected per terminal block.
Solderless terminal
with an insulation
sleeve
• 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 AC power supply and the other
one to an uninterruptible power supply (UPS).
R35B
R64P
ERR
FG
LG
INPUT
100-240VAC
Terminal block
27 PROCEDURE FOR STARTING UP A REDUNDANT SYSTEM
R35B
R64P
ERR
FG
LG
INPUT
100-240VAC
27
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27.2 Wiring