ZES ZIMMER LMG450, User Manual

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Installation LMG450
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3.3.5 Measuring circuit for measuring efficiency of 3/3phase systems
L 1
L 1 ’
G ro u p A G ro u p B
L 2
L 2 ’
L 3
L 3 ’
Figure 7: Measuring circuit for measuring efficiency (3/3phase)
With group A you measure the first three phase power, with group B the second one. The
frequencies of group A and B can be different. This is a double aron circuit.
This circuit should be measured with wiring ‘2+2 Channels’. If you have the option L45-O6
(star to delta conversion) implemented, you can also use the wiring ‘2+2, U
∆
I*->U
∆
I
∆
’ (for a
delta circuit load) or ‘2+2, U
∆
I*->U*I*’ (for a star circuit load) to determine all the values of
the load
3.3.6 Measuring circuit using an external current sensor
L
LO
A
D
N
Figure 8: Measuring circuit with external current sensor
Here you see, how to install your current sensor.