Atec Zimmer-Electronic-Systems-LMG500 - Manual (Page 6)

3
f=var
1
f=50Hz
L
N
V U 4
A
I
4
A
V U
1
I 3
Motor
A
I 1
V U 3
V U 2
A
I 2
All necessary functions
in the basic device:
- Printer interface
- RS232 interface
- Formula editor
- 3,5” Floppy drive
All necessary functions are included in the basic device at reasonable price: Printer and RS232
interfaces, formula editor and a 3,5” floppy drive.
Formula editor: the window shows some of the available
mathematical formulae, functions and logical conditions Program example for the monitoring of
overvoltage and undervoltage
Options:
The LMG500 can be expanded
with the options mentioned
here.
The
IEEE488 interface (Part
No. L50-O1) is able to interpret
the complete SCPI as well as
the LMG500-specific command
set. It has a data rate up to 1
MByte/sec.
The
Flicker measurement
(Part No. L50-04) option con-
sists of a flicker meter in ac-
cordance with EN61000-4-15,
and signals are evaluated in
accordance with EN61000-3-3.
Besides the current/voltage
inputs for power measurement,
further analog and digital meas-
uring inputs and signal outputs
are available in the so-called
Process signal interfaces,
digital and analog inputs and
outputs (Part No. L50-O3).
Process magnitudes such as
rotational speed and torque can
be fed to the device to deter-
mine the efficiency level, using
the formula editor. Signals can
be derived from the measured
values and can be output again
as control signals.
The
Harmonics up to 99th
from U, I and P (Part No. L50-O8)
Options
- Star-Delta Conversion
Part No. L50-O6
For detailed test and evalua-
tion of 3φ motors the electrical
quantities for each winding
phase are needed.
In some cases you have access
to the motor terminal block
with start and end of all three
windings. Then you can meas-
ure all what you need. But in
most cases the motor has only 3 terminals and the internal
star point or the delta winding
as to measure its current is
not
accessible.
Also far away from the motor
you have only the three wires.
With the option star-delta con-
version you have the capability
to calculate the not accessible
values (e.g. voltages, currents,
power, harmonics). This intelli-
gent solution with an additional
DSP works well at all wave
forms and every unbalance of
mains and load. Simply connect
the voltage paths in delta and
click the current clamps around
the wires. Select the internal
connection of your load and
press the „Link“ softkey.
50Hz -> f=variable, instrument for motor measurement in I∗ U∆ wiring
Calculation of the real values in the star connected winding
phases (wiring: 3+1, U∆ I∗ -> U∗ I∗) Calculation of the real values in the delta connected
winding phases (wiring: 3+1, U∆ I∗ -> U∆ I∆)
option can be used to analyse
current, voltage and power,
related to the fundamental
ranging from 0.1Hz to 150kHz.
It is possible to detect
Inter-
harmonics by a selectable divi-
sion factor giving a new funda-
mental as reference. Harmonic
analysis up to 1.5MHz possible
on external PC with ZES ZIMMER
software
TERM-L5.
CE-Harmonics (Part No. L50-O9)
up to 40th acc. to EN61000-3-2.
DSP Modules (Part No. L50-O10)
One piece necessary for
operating with options CE-harm
L50-O9, and/or flicker L50-O4
and/or Harm 99 L50-08.
Two pieces necessary for oper-
ating the above mentioned op-
tions in combination with star
to delta conversion L50-O6.
The respective quantity of DSP
modules has to be doubled
in case a second LMG500 or
the
Extension box (Part No.
LMG500-E) is connected.
The
Transients (Part No. L50-O5)
option detects peaks and dips
up to a resolution of 330ns,
sampling with 3 MSamples/s.