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Universal Measuring Device UMG 500A
W
f
cos
ϕϕϕϕϕ
Harm.
%
Q
W
Reactive power
This function displays the reactive power in the outer conductors or the sum of their reactive powers. The
unit “kvar” is indicated by an LED. The direction of the phase displacement between voltage and current is
indicated by the LEDs “ind” or “cap”.
Real work
After this key has been pressed, the device displays continuously the sum of the real work extracted in the
selected outer conductor or the total real work. With generator operation, real power returned to the supplier
is not subtracted. The unit is indicated by the LED “kWh”.
The display range is 1 to 9999 kWh. If the full scale value is exceeded, the display restarts at 0 kWh and the
number of overflows can be read off by pressing the “+” key. In this case, the work is given by the following
expression:
number of overflows * 10000 kWh + displayed value
In addition, the device counts the time from the start of measuring work. It can be read off by using the
following key combinations:
1.) Press and keep pressed down
2.) Additionally operate
Display
ΣΣΣΣΣ
days (max. 9999)
L3
hours
L2
minutes
L1
seconds
The value of the work and the elapsed time are erased if the contact “clear work” at the rear of the device is
closed or if key “W” is kept pressed down and the “-” key pressed simultaneously. Measurement of work
starts afresh immediately after erasure. If there is a power failure, the time measurement will be interrupted.
Frequency
This function displays the frequency of the voltage in L1. The unit of measurement is indicated by the LED
“Hz”.
Power factor
This key is used to display the power factor cos phi in L1, L2 or L3 or to measure the total power factor. The
LED “cos
ϕ
” indicates the operation of this function. The direction of phase displacement is indicated by the
LEDs “ind” or “cap”. With generator operation (power supply service), the power factor is displayed as “-
#.##”.
Harmonic wave content of voltage
This function displays the harmonic wave content of the measured voltage. The LED “%” indicates the unit.
The percentage shown is based on a voltage of 230 V. At the left hand side of the display an ordinal number
appears which shows which harmonic is currently being displayed ( 5th, 7th, 11th, A=13th). The percentage
value is displayed in the two right-hand segments. With each successive use of the “Harm” key, the value
of the next harmonic wave is shown.
W
Q
Reactive work
By keeping key “W” pressed down and simultaneously pressing key “Q”, reactive work is
displayed. LEDs “kWh” and “Q” light up. The information given under measurement function
real work applies in a similar way for this measurement function.
Attention:
• Only inductive power will be registered.
• The registered duration of the work measurement is valid for both real and reactive work.
• If the work is erased, either via contact “clear work” or via the key combination given in the previous section,
not only real work but also reactive work are erased.
