Mitsubishi Electric MELDAS C6 Maintenance Manual page 136

APPENDIX 9 EMC INSTALLATION GUIDELINES
Appendix 9.6 Parts for EMC Countermeasures
(2) Example of surge absorber installation
Earth
leakage
From power
breaker
supply
for panel
Input
200V/
230VAC
Grounding
Grounding
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
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.
No-fuse
breaker
Transformer
No-fuse
Reactor
breaker
MC
A
B
Circuit
protector
Surge absorber (1)
C
Example of surge absorber installation
2
or more
I - 118
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NC control
section
Other devices
(panel power
supply, etc.)
Control panel
(Relay panel,
etc.)
NC drive
section
Other devices
(power supply
for panel, etc.)
Surge absorber (2)