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Universal Measuring Device UMG 500A
Primary current of current transformer
When this key is pressed, the programmed state is displayed and can be altered by additionally pressing the
“+” or “-” keys. Setting range: 1 ... 5000 A in 1 A steps.
The set value is always based on a current transformer secondary current of 5 A (standard).
Example: for a current transformer of 500/5, “500” must be set.
For instruments fitted with a 1A transformer secondary (optional), the primary current must be set similarly
Example: for 1000/1 the value is “1000”.
.. / 5A
-
+
Key functions and Programming
Programming of Universal Measuring Device UMG 500A is carried out with the remote/local contact open, using the
keyboard and the digital display. Following a power failure, it is not necessary to reprogram the device, because the
programmed data and peak values are stored.
“+” key
This key is used - partly in conjunction with other keys - for the following functions:
• Changing set values
• Reading the peak value of the displayed function.
• Indicating overflows of work measurements (W)
“-” key
This key is used - partly in conjunction with other keys - for the following functions:
• Changing set values
• Erasing the peak value of the displayed measurement function.
• Erasing the accumulated work
• Restart of averaging power and current
Summe
ΣΣΣΣΣ
sum
Selection key “sum”
With this key, the sums of the measurement functions real power, apparent power, reactive power, real work,
reactive work and power factor, from L1, L2 and L3 are displayed. For all measurement functions other than
those referred to, this key is inoperative.
L2
L3
L1
Selection of outer conductor L1, L2 or L3
The outer conductor, for which the associated measurement values are to be displayed, is selected with this
key. The selected outer conductor is indicated by the LED “L1”, “L2” or “L3”. The frequency is only
measured in L1.
U
Voltage transformer
If required, the ratio of the voltage transformer used can be set with the aid of this key. The factor
is displayed with one decimal place. In combination with the “+” or “-” keys, the displayed value
can be altered. Setting range: 0.1 ... 999.9
Example:
Transformer
Displayed / set value
10,000 V/100 V
100.0
12,000 V/110 V
109.1
.. / 5A
Note
The voltage transformer ratio is set to 1.0 for the standard version. If this value is wrongly set
by mistake, this will result in the measured voltage and the values derived from it being
incorrectly calculated and displayed!
Note
In case of option ../1 A, primary current may not be set higher than 1000 A, otherwise calculation
of current and other dependent values (power, power factor, work) will be incorrect!
