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(4) Isolation transformer
An isolation transformer has an effect on reducing conducted noise (especially, lightning surge).
Lightning surge may cause a malfunction of the programmable controller.
As a measure against lightning surge, connect an isolation transformer as shown below.
The use of an isolation transformer reduces an impact of lightning.
100VAC
200VAC
T1
Main
power supply
Relay
terminal block
I/O power supply
I/O equipment
Inside a control panel
Programmable
controller power
supply
Isolation
transformer
Programmable
controller
Motor power supply
Motor equipment
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