Bender ISOSCAN W Series - Residual Current Exceeded (ALARM I Δn ); Connection Fault of the Current Transformers

ISOSCAN® EDS440 and EDS441
5.4.2 Residual current exceeded (ALARM I
Δn
)
This function of the EDS441… is only suitable for frequencies in the 50/60 Hz range.
The residual current flowing through the measuring current transformer is continuously measured and
displayed. If the residual current is too high, a successful insulation fault location is not possible.
If the residual current (RCM function) is exceeded, the “ALARM I
Δn
” LED lights up. In addition, the LED of the
channel on which the fault was detected lights up. In addition, the fault is indicated on the display of the
ISOMETER®.
-1
>3s ADDR.
RESET
+1
+10
TEST
CHANNELS / ADDR.
12
11109
87
345621
+10 +20 +40
Addr. Mode
n
∆
I
ALARM
L
∆
I
ALARM
SERVICE
COM/ADDR.
ON
5.4.3 Connection fault of the current transformers
The “SERVICE” LED lights up if there is a connection fault of the CTs. In addition, the corresponding channel
LED flashes.
-1
>3s ADDR.
RESET
+1
+10
TEST
CHANNELS / ADDR.
12
11109
87
345 621
+10 +20 +40
Addr. Mode
n
∆
I
ALARM
L
∆
I
ALARM
SERVICE
COM/ADDR.
ON
In case of a device error, an error code is additionally displayed on the ISOMETER®. Please have it at hand for
the Bender service.
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