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check that the voltage rises and drops in the same way a further 5 times. The round LEDs should move step at
a time to the end. Check P1 points to 230V on the PCB ident, +/-5V.
19. Slowly reduce the variac and check the output voltage goes down to 220V before rising again. This should
happen a total of 6 times.
20. Increase and decrease the variac several times and check that all LEDs (LD1 to 7) light in turn. Check also that
there is no 'thudding' noise made by either the transformer or the variac. (A faint 'click' may be heard from
the PCB but this is normal.)
21. Switch the variac off and remove the neutral connection from J5 on the ST165. Turn the variac on again and
check that the output lamp and green LED (LD5) come on for about 1 second and then go off, followed by the
four rectangular LEDs lighting in a scanning pattern.
22. Switch off, reconnect the neutral and switch on. Check the output lamp comes on again.
23. Reduce the variac and check the output switches off at 130 to 135 V input.
24. Switch off and disconnect all mains power
25. Repeat the above procedure for the other phases if required.
26. The AVR is now ready for re-connection on-line.
Following Slave PCB Replacement
The AVR should be disconnected from Mains and Load before commencing this test.
1. Connect the Variac input to a mains supply but do not switch on.
2. Connect Test Lamp across Neutral and output of phase under test.
3. Connect the Variac Neutral to the AVR incoming Neutral terminal
4. Connect Variac Live output to the Incoming Mains connection of the phase under Test.
5. UNITS WITH AVS ONLY Using Safebloc, connect (but do not switch on) mains supply live to terminal
marked 'Test Use Only' , situated bottom right of the rear panel. This will supply power to operate the AVS
contactor, switching on the lamp at the output.
6. Reduce Variac output voltage setting to zero.
7. Connect Multimeter #1 (indicating AC Voltage 600V scale) across variac output.
8. Fit clamp-on current meter around variac live out cable (set to 200A)
9. Vary input volts between 160 and 280V a number of times to ensure the replaced PCB is functioning properly.
Lamp on output should be lit.
10. Leave on soak test for 1 hour.
11. Switch off and disconnect all input and output connections.
12. The AVR is now ready for re-connection on-line
Digital Meter Function Check
The AVR should be disconnected from Mains and Load before commencing this test.
1. Connect Variac as in PCB test procedure above.
2. Connect Multimeter #1 to variac output
THREE PHASE AUTOMATIC VOLTAGE REGULATOR Issue: Jan 2016
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