OTOWA SCA-20 Instruction Manual

SCA-20 Instruction manual
Please read the instructions before installing the product, as this instruction manual
explains how to use the Surge Counter effectively and safely.

1. Connection

a) Installation of the base
1) Unfix the both side part of main body and
remove the main body and terminal cover
from the base.
b) Installation of CT
1) Earth wire for counting lightning current should be formed straight as much as possible and pass it
through the CT. (It is not necessary to pay attention to the polarity)
2) CT is fixed by a tying band. Use the accessary for fixing the tying band when it is fixed to the board.
(The tying band and the accessary are not attached.)
3) If the width of cramp terminal of earth wire is less than 19mm, it can be passed through the CT.
Earth wire
c) Connection wires
Note
・Connect wires when power supply stops.
・Use power line of 0.5 to 1.25mm
terminal block or use cramp terminal with insulation tube.
・Separate lead wires of CT and signal contact from other lead wires such as power line.
Do not twist lead wires of them to other wires, to avoid the induction by switching surge and noise.
・Twist the lead wires from CT(200mm) once per 1cm, to protect against noise.
・Do not extend the lead wires of CT（200mm） to protect against noise.
(A malfunction might be occurred.)
①Connect wires of "power source", "CT", "signal contact" to the base. Connect "short bar" to the base to
change the operating current
②The size of terminal screws is M3.5 and recommendation
tightening torque is 0.8～1.3N・m.
③Operating current should be adjusted by short bar.
10A：Short bar is not used.
50A：Short bar is connected on ⑥-⑤-④.（Initial state）
100A：Short bar is connected on ⑤-④-③.
④Signal contact specification (a type)
The signal contact becomes "close"(500ms) when operating.
(Signal contact capacity : DC30V 1A, AC125V 0.5A)
⑤After connecting wires, insert the terminal cover and the main body
to the base and fix the main body by fixing parts of the base.
Main body
Terminal cover
Base
Tying band
Tying band
. Insulation cap should be covered on the connection part of
2
Push Push
into
押し込む 押し込む
No.G1-325-14-017
2) Fix the base to DIN rail or by M4 screws.
Fix to DIN-rail
DIN rail
Accessary for fixing the tying band (No attached)
ショートバー
Short bar connection
５０Ａ
50A
１００Ａ
１０Ａ
10A
(出荷時) 100A
(Initial state)
６ ５ ４ ３
７ ８ １ ２
into Signal
接点
contact
Fix by M4 screws
M4 screws
34
.
14
Less than φ19mm
Load Load
equipmen
equipment
t
SPD SPD
CT
Base
Earth wire
Earth
Power input (AC100V,
200V common use)