2018.01 / a
10
Electric Power Generation
UF OE
UF S V
R1 R2 U N F1 F2
R121
V
DC
V
DC
V
AC
Installation and maintenance
R121
AVRs
5657 en -
9 - STATIC TEST PROCEDURE
This test should only be attempted after
making sure that the AVR has passed all
multimeter checks. Connect the AVR to the
single-phase variable voltage source as
shown in diagram 1 in this manual.
1. Keep “V-TRIM” in the minimum position.
2. Keep “UF” in the fully anticlockwise position.
3. Increase the applied voltage. The lamp
should glow increasingly brightly. At a voltage
of around 90 V-95 V the lamp should go out
slowly. Increase the voltage again up to
240 V. The lamp should stay OFF.
Decrease the voltage to below 90 V. The lamp
should glow again.
4. Turn the “UF” potentiometer clockwise. The
UF LED will glow. The lamp should go out
slowly. Now turn “UF” potentiometer
anticlockwise. The UF LED will go out. The
lamp should glow brightly again.
5. It is difficult to prescribe a static test for
checking the stability, as this is more easily
detected during closed loop tests. However, a
healthy AVR will behave as described below.
First keep the “S” potentiometer in the fully
anticlockwise position. Perform the static test
as described in steps 1, 2 and 3. The lamp will
go out fairly quickly at 90 V-95 V and come on
again quickly when the voltage is reduced to
below 90 V.
Now keep the “S” potentiometer fully
clockwise, and perform the static test as
described in steps 1, 2, and 3. The lamp
should go out much more slowly and come on
again much more slowly. At the end of this test
reset the potentiometer in the middle position.
6. Turn the “V” potentiometer fully clockwise.
Increase the voltage to 250 V. The “OE” LED
should glow and the voltmeter at F1 and F2
should read 95 V. Increasing the voltage to
305 V will turn off the lamp.
7. Connect the 2K potentiometer at terminals
R1 and R2. Turn the external potentiometer
both fully clockwise and anticlockwise. The
lamp should turn off and on alternately.
If the AVR behaves as described above
then it is in good working order.
230 V 60 W
Lamp
250 VAC
50 Hz
Variac
3 A
2K Potentiometer OR
WIRE LINK
