35
UMG 509-PRO
www.janitza.com
INFORMATION
If the main measurement is connected to a
three-phase 3-conductor network, the auxiliary
measurement can no longer be used as a mea-
surement input.
INFORMATION
For measurement with the auxiliary measure-
ment, a voltage must be connected to the main
measurement to determine the frequency.
INFORMATION
Measured voltages and currents must originate
from the same network.
7.7.3
Auxiliary input
L1
L2
L3
N
V
4
N
4w 1m
I
4
S1 S2
L1
L2
L3
V
4
N
3w 1m
I
4
S1 S2
N
PE
V
4
N
2w 1n
I
4
S1 S2
Fig. Measurement in a three-phase 4-conductor
network with a symmetrical load
L1
L2
L3
N
V
4
N
4w 1m
I
4
S1 S2
L1
L2
L3
V
4
N
3w 1m
I
4
S1 S2
N
PE
V
4
N
2w 1n
I
4
S1 S2
Fig. Measurement in a three-phase 3-conductor
network with a symmetrical load
L1
L2
L3
N
V
4
N
4w 1m
I
4
S1 S2
L1
L2
L3
V
4
N
3w 1m
I
4
S1 S2
N
PE
V
4
N
2w 1n
I
4
S1 S2
Fig. Measurement of voltage between N and PE.
Measurement of the current in the neutral conductor