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Appendix 3 Parts for EMC Measures
Appendix 3.3 Surge Protector
106
(2) Surge protector installation example
B
A
NC control
section
Control panel
(Relay panel,
etc.)
Surge protector (1)
Other device
Power supply
for panel, etc.
NC drive
section
Other device
Power supply
for panel, etc.
Earth leakage
breaker for
panel
Input
200/
230VAC
No-fuse
breaker
No-fuse
breaker
MC
Reactor
Transformer
Circuit
protector
Grounding Grounding plate
From power
supply
Surge protector (2)
Surge protector installation method
<Caution>
(1) Thick wires will enhance the lighting surge absorption effect, so keep the wire as thick and short as
possible.
-Wire material-
Wire diameter: 2mm
2
or more
Wire length: Connection length (A) to surge protector (1) is 2m or less.
Connection length (B) to surge protector (2) is 2m or less.
(2) When carrying out an insulation voltage resistance test with an overvoltage (100VAC, 1500VAC)
applied on the power supply line, remove the serge protector (2) since it will function under the
applied voltage.
(3) A short-circuit accident will occur if a surge exceeding the tolerance is applied on the surge
protector. Thus, always insert a circuit protector to protect the power supply line.
The current does not flow constantly to surge protectors (1) and (2), so the circuit protector can
also be used for the other devices.