Mitsubishi Electric MELSEC-L SSCNETIII/H User Manual page 133

(c) 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 measures against lightning surge noise,
connect an isolation transformer as shown below. Using an isolation transformer will reduce an impact of
lightning.
100V AC
200V AC
Main
Programmable
Relay
Isolation
power
controller
terminal
transformer
supply
block power supply
I/O power
supply
Motor power
supply
Inside the control panel
Programmable
controller
T1
I/O equipment
Motor equipment
APPENDICES
A
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