4
Operation
indicators
Raise LED: Indicates by blinking that the unit
is issuing a raise pulse. When the output is acti-
vated, the LED is lit.
Lower LED: Indicates by blinking that the unit
is issuing a lower pulse. When the output is ac-
tivated, the LED is lit.
TCO LED: Indicates that the tap-changer is
operating.
MAN LED: Indicates that the regulator is in
manual mode and ready to accept raise or lower
commands from the push-buttons.
The self supervision alarm indicator IRF indi-
cates that the self-supervision system has de-
tected a permanent fault. The red LED is lit
about 1.5 minutes after the fault has been de-
tected. At the same time, the plug-in module
delivers a signal to the self-supervision system
output relay of the regulator assembly.
In addition, in most cases, a fault code appears
on the display of the module. This fault code,
which consists of a red figure "1" and a green
code number, indicates the nature of the fault
and cannot be erased by resetting. The fault code
should be recorded and stated, when service is
ordered.
mA input
calibration
After installation of the voltage regulator and
the converter/transmitter of the tap-changer
position information the mA input is calibrated
as follows:
Start by raising the tap-changer manually to a
high position. Then store the mA signal as the
"mA input high value" and the corresponding
tap-changer position as the setting value "tap-
changer position high".
Then lower the tap-changer manually to a low
position. Then store the mA signal measured as
the "mA input low value"and the correspond-
ing tap-changer position as the setting value
"tap-changer position low".
The tap-changer positions high and low, from
which the mA input signal is stored, does not
necessarily have to be the highest and lowest
position of the transformer, but the measure-
ment accuracy increases with the distance be-
tween the points stored. After the calibration
the manual voltage regulating module SPCN
1D56 shows the actual tap-changer position
according to the mA input signal.
Storing the mA input signals: Store the mA in-
put signals in the same way as the setting val-
ues. First select the setting value "tap-changer
position" high or low. Then choose the submenu
by pressing the program button for 1 s. The
number "1" starts flashing to indicate that you
have entered submenu 1. Proceed by pressing
the program push-button once again for about
5 s, until the middle segments of the three
rightmost digits start flashing. Finally, store the
present mA input signal as the high or low sig-
nal by pressing the program and reset/step but-
tons simultaneously.
mA
1
15
10
5
18
mA
1
15
10
5
18
Position
Pos. low
mA low
Position
Pos. high
mA high
Pos. low
mA low
mA high
Pos. high
Ex. 1. mA input calibration with the transformer
in service. Normal operating tap-changer posi-
tion is 9 and the tap-changer is raised and low-
ered two steps for calibration.
Ex. 2. mA input calibration with the transformer
out of service. The tap-changer is raised and
lowered to minimum and maximum positions
for calibration.
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