OTOWA SCA-20 User manual

SCA-20 Instruction manual No.G1-325-14-017
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.
c) Connection wires
・Connect wires when power supply stops.
・Use power line of 0.5 to 1.25mm2. Insulation cap should be covered on the connection part of
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.
2) Fix the base to DIN rail or by M4 screws.
Note
.
.
M4 screws
DIN rail
34
14
Fix to DIN-rail
Fix by M4 screws
押し込む
押し込む
Accessary for fixing the tying band (No attached)
Less than φ19mm
６ ５ ４ ３
７ ８ １ ２
１０Ａ
５０Ａ
(出荷時)
１００Ａ
ショートバー
接点
Base
CT
Earth wire
Earth
SPD
SPD
Load
equipmen
t
Main body
Terminal cover
Base
Earth wire
Tying band
Tying band
Load
equipment
Short bar connection
50A
(Initialstate)
Power input (AC100V,
200V common use)
Signal
contact
Push
into
Push
into
10A
100A

2. Instruction to use
1) Supply power source
①Supply the power source after checking the wire connection.
②After supplying the power source, LED indicator shows number increasing such as “00”→”11”→”22”
→”33”→・・・ and in 10 seconds, it stops increasing the number and shows the number of counts.
(The number of counts means the number of lightning current that CT detected.)
③Push “reset”button to return to zero on LED indicator.
2) Operating
①When lightning current of more than operating current flows through CT (Max. 20kA(8/20μs)), LED
indicator shows 1 number rise up and signal contact becomes “close”(500ms).
②Each operating time is about 1 seconds.
③The number of counts is memorized even if power supply stops. After power supplies, LED indicator
shows the number of counts memorized before.
④LED indicator can show 254 counts maximum.
⑤Dot shown in below figure is used to indicate more than 100 counts or 200 counts.
⑥Even if LED indicator shows more than 255 counts, signal contact becomes “close”(500ms) when the
lightning current of more than operating current flows through CT.
3) Operation check
①When pushing “Test”button, indicator counts one increasing and signal contact becomes “close”
(500ms).
②Push “Test”button continuously with the interval of 1second.
③Push “reset”button to return to zero on LED indicator.
・After power fail recovery, the indicator shows the number increasing such as 「00」→
「11」→「22」・・・. Until stop increasing the number, this product cannot operate when it
detects the lightning current. And it is no use to push “Test”and “Reset”button in this condition.
3．Notice
・Operating voltage range should be AC90V～240V（50/60Hz）. Do not use in out of this range.
・This product has no function as the arrester. Supply power source from the earth side of the SPD.
・Maximum measurement current should be 20kA(8/20μs). It might be broken by large lightning current
such as direct lightning strikes.
・This product can be used only indoor. Do not use outdoor or in the place where it is splashed with water.
・Handle this product carefully to prevent mechanical shock. It may cause breaking or damage.
・A malfunction might occur when this product is installed in the place where switching surge is
synchronized on power source for it or CT receives the induction of noise.
・Operating current in this manual means the current value with the shape of 8/20μs.
・It is not necessary to do maintenance, but push “Test”button to check the operation once a year.
Indicator showing of the number of counts
Indication of when supplying power source
(Example of 5 counts)
約１０秒
停止
Supplying
Power source
Zero
One
99
100
101
102
199
200
201
202
254
More than 255
Dot (100 to 199)
Dot (More than 200)
Note
カウント数
About 10 seconds
Stop
The number
of counts
Two