31
(1) Wiring of power supply
(a) When voltage fluctuations are larger than the specified value, connect a
constant-voltage transformer.
Constant
voltage
transformer
Programmable
controller
(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 insulating transformer.
Programmable
controller
Insulating
transformer
I/O
equipment
Insulating
transformer
(c) When a power transformer or insulating transformer is employed to
reduce the voltage from 200 VAC to 100 VAC, use one with a capacity
greater than those indicated in the following table.
Power Supply Module
Transformer Capacity
A1S61PN 110VA
n
A1S62PN 110VA
n
n: Stands for the number of power
supply modules.
(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 insulation 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.
controller
200VAC
T1
Main
power supply
Relay
terminal
block
Programmable
power supply
Insulation
Transformer
I/O power supply
I/O equipment
On a control panel
Main circuit
power supply
Main circuit equipment
Programmable
controller
