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E70 Series Connection Manual
Appendix 2.6 EMC Countermeasure Parts
171
(3) Example of surge absorber installation
An example of installing the surge absorber in the machine control panel is shown below.
A short-circuit fault will occur in the surge absorber if a surge exceeding the tolerance is applied. Thus, install a
circuit protection breaker in the stage before the surge absorber. Note that almost no current flows to the surge
absorber during normal use, so a breaker installed as the circuit protection for another device can be used for the
surge absorber.
Surge absorber installation
CAUTION
1. The wires from the surge absorber should be connected without extensions.
2. If the surge absorber cannot be installed just with the enclosed wires, keep the wiring length of A and B to 2m
or less. If the wires are long, the surge absorber's performance may drop and inhibit protection of the devices
in the panel.
3. Surge absorber to be selected varies depending on input power voltage.
B
A
MC
NC unit
Control panel
(relay panel,
etc.)
Other device
(panel power
supply, etc.)
Other device
(panel power
supply, etc.)
Panel earth
leakage
breaker
Input
power
AC reactor
Transformer
Grounding
Grounding plate
Factory power
Contactor
Circuit
protector
Power supply
unit
and
drive unit
(1) Surge absorber
(Protection across phases)
(2) Surge
absorber
(Protection across each phase's grounding)
Circuit
protector
Circuit
protector