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APPENDIX 9 EMC INSTALLATION GUIDELINES
Appendix 9.6 Parts for EMC Countermeasures
I - 118
(2) Example of surge absorber installation
Example of surge absorber installation
Control panel
(Relay panel,
etc.)
Surge absorber (2)
Surge absorber (1)
Earth
leakage
breaker
for panel
Input
200V/
230VAC
No-fuse
breaker
No-fuse
breaker
MC
Reactor
Transformer
Circuit
protector
Grounding
Grounding
From power
supply
C
B
A
NC drive
section
Other devices
(power supply
for panel, etc.)
Other devices
(panel power
supply, etc.)
NC control
section
Precautions
(1) Thick wiring enhances the lightning surge absorption effect, so make the wiring se as thick and
short as possible.
Wire material : Wire diameter 2mm
2
or more
Wire length : Connection to surge absorber (1): Wire length (A) is 2m or less
Connection to surge absorber (2): Wire length (B) is 2m or less
Grounding to surge absorber (2) : Wire length (C) is 2m or less
(2) When carrying out a withstand voltage test by applying an overvoltage on the power line,
remove surge absorber (2) as it will activate with the applied voltage.
(3) A short-circuit fault will occur if a surge exceeding the tolerance is applied on the surge
absorber. Thus, always insert a circuit protector to protect the power supply line.
A current does not flow to surge absorber (1) and (2) during normal use, so the circuit protector
can be shared with other devices.