41
= Key1
= Key 2
= Key 3
= Max. value or consumption = Min. value or supply
Aron circuit
Voltage over 500VAC against ground must be con-
nected via voltage transformers. The voltage
measurement via voltage transformers can be
carried out via two voltage transformers (Aron
circuit) or three voltage transformers by choice.
For direct measurement and measurement via three
voltage transformers, „4L“ must be set at UMG 505
and for measurement with two voltage transformers,
„3L“ must be set.
The manufacturer’s presetting is „4L“.
In menu
CONF
you can select between Aron circuit
„3L“ or four wire measurement „4L“.
Select
In menu
CONF
scroll
to indication of four
wire measurement or
Aron circuit with
key
3.
In this example, four
wire measurement „4
L“ is activated.
Change
Press
key 1.
The digits „
4 L
“ flash.
The symbol
EDIT
appears.
With
key 3 you can
changeover from four
wire measurement „
4
L
“ and Aron circuit „
3
L
“ .
Confirm selection
with
key 1.
The symbol
EDIT
disappears.
CONF
EDIT
CONF
Diagr. Aron circuit with two voltage transformers and
two current transformers.
Diagr. Aron circuit with two voltage transformers and
three current transformers.
Messung
Measurement
Hilfs-
spannung
Auxiliary
Voltage
UMG505
27 26 25 24
23 22 21 20 19 18
14 15
u v PE
2A
L/L 80 .. 870V AC
L/PEN 50 .. 500V AC
0,005 .. 5A
10160410
u v u v
U V U V
k l
k l
k l
../5(1)A
../5(1)A
../5(1)A
Verbraucher
Consumer
4-
10A
Messung
Measurement
Hilfs-
spannung
Auxiliary
Voltage
UMG505
27 26 25 24
23 22 21 20 19 18
14 15
u v PE
2A
4-
10A
L/L 80 .. 870V AC
L/PEN 50 .. 500V AC
0,005 .. 5A
10160430
u v u v
U V U V
k l
k l
../5(1)A
../5(1)A
Verbraucher
Consumer
Press
key 1 for about 2 seconds and you return to
the first measured value window of the measured
value indication from each program part.
