Atec Zimmer-LMG450 User Manual
Page 4
V
U
4
A
A
I
3
I
4
U
2
A
A
I
1
I
2
V
U
1
V
Aircraft
electrical
system
V
U
3
3Ø
f=400Hz
3Ø
f=60Hz
˜˜˜
3
f=var
1
f=50Hz
L
N
V
U
4
A
I
4
A
V
U
1
V
U
2
V
U
3
A
I
1
A
I
2
I
3
Motor
1
3
4
5
6
2
Measurement on two systems
with different frequencies
In wiring A:1+2 B:3+4, the
ARON circuit is two times used.
The block diagram shows that
The following block diagram
applies wiring A:1+2+3 B:4 and
is typical for a low power speed
only one LMG450 is needed for
complete measurement.
Generally frequency converters
for speed variable drives or
frequency conversion have no
neutral on input or output.
60Hz -> 400Hz
variable drive. This example is
used to explain the settings
and displays of the LMG450.
The screenshots were made with
the free software BMP2PC from
ZES ZIMMER.
50Hz -> f=variable
Setting of global parameters,
e.g. wiring (see table at
previous page)
Configuration of measuring
inputs and sychronisation
source for group A
Configuration of measuring
inputs and synchronisation
source (same as picture ,
but for group B)
Measuring ranges, autorange
or manual, setting of scaling
factors for external CT’s or
VT’s (group A)
Measuring ranges, autorange
or manual, setting of scaling
factors for external CT’s or
VT’s (group B)
Display of different plugged
external current sensor
devices from ZES ZIMMER,
here the bottom one is in use
(enabled)
1
3
4
5
6
2
2