gefran GTD 25 / 40A Bedienungsanleitung Seite 10

SIGNAL LED
V supply present
Control signal present
Alarm output active
Example:
Vn=230V Rated voltage of load
ll= 26.5 A Load current
It*= 21 A Alarm setpoint: alarm trips if current drops below this value.
(*) When setting the alarm current (lt), remember that line fluctuations (normally ± 10%) vary the value of current II
by the same percentage. Therefore, you have to set the setpoint with the necessary margins to prevent false
alarm signals.
With the dip switches, set the full scale value of the alarm current (lfs) according to the following table:
Therefore, with con II = 26.5 A, set the full scale current at lfs = 30A
With the trimmer, set the alarm current (lt) according to the following formula:
In the example TR% = 21[A] / 30[A] * 100 = 70%
Checking the Hb alarm
Activate the device by feeding the load to maximum current.
With current-sensing pliers, check current to the load (ll).
The yellow alarm LED must be off.
Turn the trimmer counterclockwise: alarm current lt increases.
When the yellow alarm LED lights up, the alarm current equals load current (lt= ls).
The alarm is active.
Turn the trimmer clockwise to reduce alarm current lt until the trimmer returns to its original position (with the yel-
low LED off).
RED LED
RED LED
YELLOW LED
Load current (II) @ Vn
0...4A
4...9A
9...13A
13...18A
18...22A
22...27A
27...31A
31...40A
TR% = It / Ifs * 100
SELECTION OF FULL SCALE
ALARM CURRENT (Ifs)
SETTING THE ALARM CURRENT (It)
Full scale
alarm current (Ifs)
5A
10A
15A
20A
25A
30A
35A
40A