
A. FITTING A LIGHTNING SURGE
PROTECTION DEVICE
B–65162E/03
APPENDIX
580
D To increase the efficiency of lightning surge absorption, the wires
indicated by bold lines should be as short as possible.
Wire cross–sectional area:
2 mm
2
or more
Wire length:
The total length of the cables used for lightning surge protection
device 1 (a) and that used for lightning surge protection device 2
(b) must not exceed 2 m.
D When performing a dielectric strength test by applying an overvoltage
to the power line, lightning surge protection device 2 must be removed
to enable the applied voltage to be maintained.
D The circuit protector (5 A) works for line protection when the lightning
surge absorber is short–circuited because of a surge higher than its
rating being applied.
D Because current does not flow through the lightning surge absorber 1
nor 2 in a normal state, the circuit protector (5 A) can be used together
with the surge absorbers as well as with other equipment. It can be
connected to the power supply for power supply module control or
spindle motor fans.
D Use Y connection neutral point grounding for the 400 V power
supply. It cannot be used for the ∆ connection 400/460 VAC line.
A.2
NOTES