ZES ZIMMER LMG450, User Manual

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Z E S ZIMMER Electronic Systems GmbH Chapter 3
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For easy usage all ZES sensors have an EEPROM implemented in which we have stored the
name, scaling, ranges, adjustment and delay time. The LMG450 recognises automatically,
which ZES sensor is connected and sets up the range menu. Further on we correct some of the
errors the sensor produces (transfer error, delay time). So you get the best measuring results
with each sensor.
Most sensors are supplied by the instrument. But some have an additional 9 pin SUB-D
connector for an external supply (for example PSU-S6). This has also to be connected.
In this monophase application you could use every wiring.
3.3.7 Measurement of high currents
LO
A
D
L 1
S 1 S 1
S 1
P 1
C T1 C T2 C T3
P 1 P 1
S 2 S 2 S 2
P 2 P 2 P 2
L 3
N
L 2
Figure 9: Measuring circuit for measuring high currents with transformers, voltage directly
In this figure you see how to measure a 3/4 phase system with high currents. The current path
is connected via transformers to enlarge the ranges of the LMG450. For this measurement you
should use the wiring ‘3+1 Channels’.
When using voltage or current transformers please watch the applicable safety standards (e.g.
earthing, isolation, ...)!