Specifications
Main variables
Variables that can be monitored and displayed
System
Average
(dmd)
Min RS485 Analogue out
V
LL
,V
LN
V asymmetry
A
An
Hz
VA
var
W
PF
+kWh (*)
-kWh (*)
+kvarh (*)
-kvarh (*)
THD (A-V)
THD even (A-V)
THD odd (A-V)
Single harmonic
Single ph Max Alarm Out Pulse
(*) Total and time-period energies
Analysis of the power quality and control of the electrical parameters
The problems that more frequently occur in electrical systems with:
• inverters and power converters;
• switching power supplies for computer and communication
system applications;
are the following:
• failures on compensation capacitors;
• blowing of capacitor fuses;
• overheating of power supply transformers with a load
current below the rated value;
• overheating of motors and frequent failures;
• high neutral conductor currents;
• problems on electronic motor controls.
They are mainly due to the harmonic contents of currents
and voltages.
The best solution is WM3 96 that allows to continuously
monitor the harmonic contents of currents and voltages
together with all other electrical parameters. The control of
more than one electrical parameter by means of alarm set-
points and the automatic recording of events allow the
operator to monitor any anomaly of the installation and of
the loads in real time, so as to promptly decide and plan
any maintenance actions, thus avoiding possible damages
to the loads and/or expensive stopping of the machinery.
• Histogram displaying of the harmonic contents relating to every single phase for A and V
• Complete harmonic analysis up to the 50th harmonic
• Numerical displaying as an absolute and percentage value of the single harmonic
• Four-quadrant displaying of the harmonic phase with source detection (generated
harmonics and imported harmonics)
• It is possible to record up to 480 events that can be the combination of alarms, diagnostics,
minimum and maximum values, with reference to: date, time and variable being controlled.
• Energy consumption storage. The RS232+RTC module allows the storage of the energy
consumption of the previous two months.
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