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= Key 1
= Key 2
= Key 3
= Maximum or consumption = Minimum or supply.
Net frequency
The net frequency is determined from the measuring
voltage within the UMG 503. From this net frequency,
the scanning frequency for current and voltage inputs are
calculated.
For measurements with very distorted voltages, the fre-
quency of the voltage fundamental cannot exactly be
determined any longer. Voltage distortion occurs in
measurements at consumers, which are driven with phase
changing controllings.
For measuring voltage, which shows strong distortion,
the corresponding stable net frequency should be set.
Distortion of the current does not affect the determinati-
on of the frequency.
If the measuring voltage is missing, no net frequency can
be determined and no scanning frequency can be
calculated. Voltage, Current and all resulting values are
not calculated and indicated by zero.
If the current should be measured without measuring
voltage, the net frequency should be set at UMG 503.
The determination of the scanning frequency can either
be done automatically or programmed.
The following settings for the determination of the fre-
quency are at your disposal:
"
Auto
"
Automatical frequency
"
50
"Hz
Stable frequency
"
60
"Hz
Stable frequency
The proceeding for the determination of the frequency
can be called up and changed in the menu
CONF
.
Select
In menu
CONF
you
can leaf to the indicati-
on of the frequency
deter-mination using
key 3
.
In this example, the fre-
quency is determined
automatically.
Change
Using
key 1,
the deter-
mination of the fre-
quency is selected, and
the text "Auto" flashes.
In the indication, the
text
EDIT
appears.
Using
key 3,
you can
change over between
the two methods of fre-
quency determination.
In this example a fix
frequency of
50Hz
is
set.
Hz
SELECT
EDIT
CONF
Hz
SELECT
CONF
