Mitsubishi Electric MELCEC Q Series User Manual page 157

9. LOADING AND INSTALLATION
CAUTION
(b) Use a power supply which generates minimal noise between wires and between
the programmable controller and ground.
If excessive noise is generated, connect an isolating transformer.
Programmable
controller
Insulation
transformer
(c) When using a power transformer or an isolating transformer to reduce the
voltage from 200VAC to 100VAC, its capacity must be equal to or greater than
the corresponding value shown in the following table.
Power Supply
Module
A1S61PN
A1S62PN
(d) Separate the programmable controller's 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.
(e) 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
AC200V
Relay
terminal block
On a control panel
(f) Precautions on using the 24VDC output for the A1S62PN power supply module
Do not connect multiple power supply modules to one module in parallel.
The power supply modules may be heated, resulting in a fire or failure.
Insulation
transformer
Transformer
Capacity
n: Indicates the number of power supply modules.
110VA n
110VA n
Programmable
Insulation
controller
Transformer
power supply
T1
I/O power supply
Main circuit
power supply
9 - 25
I/O
equipment
Programmable
controller
I/O equipment
Main circuit equipment