Mitsubishi Electric MELDAS 600 Series Connection Manual page 21

(2) Examples of surge absorbers
Types of Okaya Denki Sangyo Co., Ltd. surge absorbers
Surge
Type
absorber
(1) RAV-781BWZ-4
(2) RAV-781BYZ-2
(3) RAV-781BXZ-4
∗ Refer to the manufacturer's catalog for details characteristics, outline and connection methods
of the surge absorber.
(3) Surge absorber installation method
Earth leakage
From power
breaker for
supply panel
Input
200/
230VAC
Grounding
Grounding plate
Precautions
1) Thick wires will enhance the lighting surge absorption effect, so keep the wire as short as possible.
Wire material : Wire diameter 2mm
Wire length : Connection length (A) to surge absorber (1) is 2m or less
For connection length (B) to surge absorber (2), and
Connection length (C) to surge absorber (3), the total wire length must be 2m or less.
2) When carrying out a withstand voltage test, while applying an overvoltage (100VAC, 1500VAC) on the power supply line,
remove surge absorbers (1) and (3) as the surge absorber will function with the applied voltage.
3) A short-circuit accident will occur if a surge exceeding the tolerance is applied on the surge absorber. Thus, always insert a
circuit protector to protect the power supply line.
The current does not flow constantly to surge absorbers (1), (2) and (3), so the circuit protector can also be used for the other
devices.
CHAPTER 3 INSTALLATION
3.3 Noise Countermeasures
Circuit Max. tolerable
voltage circuit voltage
[Vrms] [Vrms]
250 500
250 300
250 500
Transformer
No-fuse
breaker
MC
Ａ
Surge absorber (1)
Circuit
protector
Surge absorber (2)
Ｂ
Surge absorber installation method
2
or more
15
Surge
Clamp
resistance
voltage
level
[V]±10%
8/20µ S [A]
700 2500
783 2500
700 2500
No-fuse
breaker
NC control
section
Other device
(power supply
for panel, etc.)
Reactor
NC control
section
Other device
(power supply
for panel, etc.)
Surge withstand voltage
(Electrical-discharge start
voltage)
1.2/50µ S [V]
2K
20K
2K
Control panel
(relay panel,
etc.)