Mitsubishi Electronics E70 ユーザーズマニュアル

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.

NC unit

Control panel

(relay panel,
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