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< Example of surge protector installation >
An example of installing the surge protector in the machine control panel is shown below.
A short-circuit fault will occur in the surge protector if a surge exceeding the tolerance is applied. Thus, install
a circuit protector in the stage before the surge protector. Note that almost no current flows to the surge
protector during normal use, so a circuit protector installed as the circuit protection for another device can be
used for the surge protector.
Panel earth
leakage
Factory power
breaker
Input
power
Grounding
1. The wires from the surge protector should be connected without extensions.
2. If the surge protector cannot be installed just with the enclosed wires, keep the wiring length of A
CAUTION
and B to 2m or less. If the wires are long, the surge protector's performance may drop and inhibit
protection of the devices in the panel.
3. Surge protector to be selected varies depending on input power voltage.
Transformer
Circuit
AC reactor
protector
A
Circuit
protector
B
Grounding plate
Installing the surge absorber
MDS-D-SVJ3/SPJ3 Series Specifications Manual
Appendix 4-6 EMC countermeasure parts
Circuit
protector
NC unit
Other device
(panel power
supply, etc.)
Contactor
MC
drive unit
Other device
(panel power
supply, etc.)
(1) Surge protector
(Protection across phases)
(2) Surge protector
(Protection across each phase's grounding)
Control panel
(relay panel,
etc.)
Appendix 4 - 19
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