
B–63783EN/01
3. INSTALLATION
27
(1) For better surge absorbing effect, the wiring shown by heavy line in
Fig. 3.7.1 (a) must be as short as possible.
Wire:The wire size must be 2 mm
2
or greater.
Wire length: The sum of the wire for the connection of surge
protector <1> a and that of surge protector <2> b
must be 2 m or less.
(2)If conducting dielectric strength tests by applying overvoltages (1000
VAC and 1500 VAC) to the power line, remove surge protector <2>.
Otherwise, the overvoltages will activate the protector.
(3)The nonfuse breaker (5A) is required for line protection if a surge
exceeding the capacity of the surge protectors is applied, causing the
surge protectors to be short–circuited.
(4)Because no current flows through surge protectors <1> and <2> during
normal operation, the nonfuse breaker (5A) can be shared by other
devices. It can be connected to the control power for the power supply
module and to the power for the fan motor of the spindle motor.
For the surge absorbers made by Okaya Denki Sangyo Co.
For the 200–V system
Between lines R·A·V–781BYZ–2
Between line and ground R·A·V–781BXZ–4
For the 400–V system
Between lines R·A·V–152BYZ–2A
Between line and ground R·A·V–801BXZ–4
3.7.2
Notes
3.7.3
Examples of Surge
Protectors