
9. CONNECTION
B–65192EN/02
96
(2) Cautions
CAUTION
1 Minimize the length of wiring indicated in solid line so as to
enhance the lightning surge absorptive effect.
Wire cross–sectional area :
2 mm
2
or more
Wire length :
The total length of the cable used for lightning surge
protector 1 (a) and that used for lightning surge protector
2 (a) must not exceed 2 m.
2 When a dielectric strength test is conducted with an
overvoltage (1000 or 1500 VAC) applied to the power line,
previously remove the lightning surge protector 2;
otherwise, it will operates on the supplied voltage.
3 The circuit protector (5A) is intended to protect the line if
a lightning surge protector is short–circuited and fails to
operate because of a surge voltage higher than its tolerance
being applied.
4 Because usually no current flows through the lightning
surge protectors 1 and 2, they can share the circuit
protector (5A) with other equipment.
The circuit protector can be connected to the SVU control
power supply and the fan motor power supply for the
separate regenerative discharge unit.
(3) Examples of lightning surge protectors
Surge absorbers manufactured by Okaya Electric Industries Co. , Ltd.
Lightning
surge
protector
Model
Clamp
voltage
(V)
10%
Surge
withstand
current
8/20µs (A)
Surge
withstand
voltage
1. 2/50µs
(V)
Maximum
allowable
circuit
voltage
(Vrms)
1 R · A · V
–781BYZ–2
783 1000 12K 300
2 R · A · V
–781BXZ–2A
783 1000 12K 300