Mitsubishi MELDAS MDS-C1 Instruction Manual page 325

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 protection breaker in the stage before the surge protector. Note that almost no
current flows to the surge protector during normal use, so a breaker installed as the circuit
protection for another device can be used for the surge protector.
Panel earth
Factory
leakage
power
breaker
Input
380 to
480VAC
Grounding
Grounding plate
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
CAUTION
Appendix 3. EMC Installation Guidelines
Transformer
Contactor
MC
Breaker
A
Breaker
B
Installing the surge absorber
the wiring length of A 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.
A3 - 17
Breaker
NC unit
Other device
(panel power
supply, etc.)
AC reactor
Power supply
unit and
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.)