Mitsubishi Electric MDS-E Series Instruction Manual page 539

MDS-E/EH Series Instruction Manual
14 Appx. 5: EMC Installation Guidelines
< 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
protector in the stage before the surge absorber. Note that almost no current flows to the surge absorber during normal
use, so a circuit protector installed as the circuit protection for another device can be used for the surge absorber.
Panel earth
leakage
Factory power
breaker
Input
power
Grounding
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 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.
4. Do not insert the surge absorber in the place with a lot of harmonic components.
IB-1501229-F
Transformer
Circuit
AC reactor
protector
Circuit
protector
A
Grounding plate
Installing the surge absorber
Circuit
protector
NC unit
Other device
(panel power
supply, etc.)
Contactor
MC
Power supply
unit
and
drive unit
Other device
(panel power
supply, etc.)
Surge absorber
(Protection across phases/
Protection across each phase's grounding)
508
Control panel
(relay panel,
etc.)