Wiring; Wiring Precautions - Mitsubishi MELESEC-ST User Manual

10 MOUNTING AND INSTALLATION

10.4 Wiring

10.4.1 Wiring precautions

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Completely shut off the external power supply for the whole system
DANGER
before installing or placing wiring. Failure to do so may result in
electric shock or damage to the product.
Make sure to ground the FG and LG terminals to the protective
CAUTION
ground conductor. Failure to do so may electric shock or
malfunction.
Confirm the rated voltage and terminal layout of the product and
then install wiring to the base module correctly. Connecting to an
external power supply other than the rated one or mis-wiring may
cause fire or failure.
Tighten the terminal screws within the specified torque range.
Loose tightening may result in short circuit, fire or malfunction.
Overtightening may cause damage to the screw and/or the
module, resulting in a fall, short circuits or malfunctions.
Make sure not to let foreign matter such as dust or wire chips get
inside the module. Failure to do so may cause fire, failure or
malfunction.
This section provides the precaution when wiring to power.
(1) Power supply wiring
(a) Separate the MELSEC-ST system's external power supply line from the
lines for I/O devices and power devices as shown below.
When there is much noise, connect an isolating transformer.
Main power
supply
200VAC
MELSEC-ST
Isolating
system
transformer
power supply
T1
I/O power supply
Main circuit
power supply
MELSEC-ST
External SYS.
MELSEC-ST
power supply system
External AUX.
power supply
I/O devices
Main circuit device
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