Atec LMG450 User Manual
4-Channel Power Meter LMG450
Universal Meter for Motors, Power Electronics
and Energy Analysis
Best
Accuracy
0.1%
LMG450 e 01.07
LMG450
General
The four-channel LMG450 power
meter is another advanced
product from ZES ZIMMER
LMG series of precision power
meters, tried and tested and
with great acceptance in the
market. It is designed as a universal meter for the entire field
of power electronics and network analysis. It can be used in
practically all power electronics
applications, in development
and test systems, in quality assurance and maintenance.
It is fully frequency inverter
compatible.
Of course, it can also be used
for measurements in motors,
transformers, conventional and
switched power supply units.
It is also suitable for mains
analysis measurements.
Easy operation thanks to
colour graphics display and
hotkeys for important
measured values
Status bar
Various value tables can be
called on the colour graphics
display at the press of a key,
either with six values in large
letters, which can also be read
at a glance from a greater
Channel 1 with 11 measuring values Range setting and scaling
distance, with twelve values
or with up to 40 values e.g. in
range setting or in harmonics
table. The graphics display
allows scope and plot functions
for waveform and timing diagrams, as well as xy diagrams or
bar charts for the harmonics.
The status bar at the top of
each display menu shows the
input level of the four voltage
and the four current inputs – an
important item of information
for the quality of the measurement.
The display also indicates what
groups, A and B, the input
channels are switched to and
which signals the groups are
synchronised to.
Measurement inputs
Scope function for waveform of sampling values Plot function of calculated values
The direct measurement inputs
for voltage and current have a
very wide dynamic range:
Eight voltage ranges from 6V to
600V, and six ranges for current
from 0.6A to 16A.
A further voltage input (six
LMG450 – rear view
ranges from 0.12V to 4V),
designed for isolating current
sensors, extends the current
measuring range almost indefinitely. With the help of the
special current clamps supplied
by ZES ZIMMER and designed
for the LMG450, current can be
measured during running operations, without interrupting the
current path.
Compensated current clamp
Part No. L45-Z06
A special current measuring device is the
compensated current clamp by ZES ZIMMER.
It features electronic compensation of amplitude
and delay errors. Even at low current levels of
1A to 40A, measurement is exact in the frequency
range from 5Hz to 20kHz. Due to its high dynamic
common-mode rejection, this current clamp is also
very suitable for carrying out measurements at the
frequency inverter output.
Various methods of applying current to be measured
4mm safety sockets
Direct measurement
0.6 ... 16A (6 Ranges)
DC ... 20 kHz
600V CAT III
Compensated current clamp L45-Z06
PSU200/400/600/700
Precision current transducer
1A ... 700Apeak
DC ... 20kHz
(300kHz, bandwidth of sensor
is limited by LMG450)
Standard current clamps
with current outputs >0.5A
100A ... 3000A
45Hz ... 3kHz
Compensated
ZES current clamps
1.2A ... 40A (6 Ranges)
5Hz ... 20kHz
Magneto-resistive
current transducer modules
5A ... 50A
DC ... 20KHz
4 independent power measuring channels
The current and voltage paths
of the four power measuring
channels are all isolated from
each other and from earth.
This allows a high degree of
measuring freedom in many
different power measurement
applications.
The adjacent table shows vari-
High power batterie
chargers (3Ø -> DC)
ous types of wirings for grouped
and individual measurement
channels. The table also assigns
application examples for the
respective types of wiring.
Rectifier section of
inverters (3Ø -> DC)
inverters (DC -> 3Ø)
Power measurement channels
1 and 4 can each be synchronised to their input signals
(fundamental waves etc.)
independent of each other.
Channels 1 and 4 are then the
Power supplies with
1Ø Transformers with
synchronisation references for
the other channels contained in
groups A and B.
3Ø laods with auxiliary
This is a very useful method for
carrying out efficiency measurements for equipment where the
input and output have different
frequencies, for example a
3-phase frequency inverter with
single-phase mains supply.
Wiring settings in () are featured
by option „Star-Delta Conversion“
Standard current clamps with
voltage/current (<0.5A)
outputs
10A ... 200A
45Hz ... 3kHz
Hall effect transducers
5A ... 200A
DC ... 20kHz
HD15 sockets
for external sensors
DC/AC current clamps with
voltage output
e.g. for oscilloscopes
10A ... 200A
DC ... 20kHz
Ch 1 Ch 2 Ch 3 Ch 4
4Ø 4W / 4Ø 5W
1Ø 2W 1Ø 2W 1Ø 2W 1Ø 2W
3Ø 3W / 3Ø 4W / 4Ø 4W 1Ø 2W
3Ø 3W (Aron) 3Ø 3W (Aron)
3Ø 3W (Aron) 1Ø 2W 1Ø 2W
Device Measured Value Ch 1 Ch 2 Ch 3 Ch 4
4Ø motors Power of all windings Phase 1 Phase 2 Phase 3 Phase 4 4+0
Output section of
1Ø -> 3Ø inverter
Low power motor
drives
multiple outputs
multiple output
windings
supplies
3Ø -> 3Ø inverter
High power motor
drives
3Ø -> 1Ø
AC power source
Input and output
power, efficiency
Input power,
rectifier efficiency
Output power,
chopper efficiency
Input and output
power, efficiency
Input and output
power, efficiency
Input and output
power, efficiency
Complete input power Phase 1 Phase 2 Phase 3
Input and output
power, efficiency
Input-, output- and
DC-Bus power,
efficiency
Phase 1 Phase 2 Phase 3 DC-Out
Phase 1 Phase 2 Phase 3 DC-Bus
AC-Out 1 AC-Out 2 AC-Out 3 DC-Bus
AC-Out 1 AC-Out 2 AC-Out 3 Phase 1
DC-Out 1 DC-Out 2 DC-Out 3 Phase 1 3 +1
AC-Out 1 AC-Out 2 AC-Out 3 AC-In 3+1
Aux. AC
or DC
AC-In 1 AC-In 2 AC-Out 1 AC-Out 2
AC-In 1 AC-In 2 DC-Bus AC-Out
Appropriate setting
Group A Group B
of wiring
3+1
(UD I* -> U* I*)
3+1
(UD I* -> U* I*)
3+1
(UD I* -> UD ID)
3+1
(UD I* -> U* I*)
3+1
(UD I* -> UD ID)
2+2
(UD I* -> UD ID)
2+2
(UD I* -> U* I*)
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