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6 Trouble Shooting
6.1 Safety - Under no circumstances should any work be carried out on the unit unless the supply is
isolated.
6.2.False Starting.
If it is found that the AVR keeps trying to start but turns off immediately, this is most likely to be due to poor wiring
to the AVR or in the building. This could be:
a) Cabling is not thick enough.
b) Cabling is too long for its thickness leading to excessive volt drop.
c) Poor joints or connections.
Any such problems should be corrected, so that the supply can deliver the high currents necessary to run the
load.
6.3 Shut Down
If it is found that the unit switches off after some time even when the mains voltage is good, it may be that the
AVS is detecting some bad condition of the mains supply that is not apparent without the use of test equipment.
Alternatively, it may be that the temperature overload is operating, in which case the following points should be
checked:
a) The output current is not above that stated on the serial label at the rear of the AVR.
b) The AVR is not subject to excessive ambient temperature due to a poor location near a source of heat.
c) The ventilation grills on the side of the AVR case have not been covered or blocked.
d) That there is room for free movement of air around the outside of the AVR casework.
Common trouble shooting points:-
Problem
AVR trips main breaker at switch on.
AVR shuts down after a period of
normal operation.
AVR shuts down immediately upon
switch on.
Input power is present but there is no output.
Three phase equipment rotates
backwards.
THREE PHASE AUTOMATIC VOLTAGE REGULATOR Issue: Jan 2016
Cause/Solution
1. Check that input and output wiring is not shorted out.
2. Check that input circuit breaker is suitable for
inductive loads.
1. Check that load does not exceed rated output.
2. Check that ventilation ducts/fan outlets are not blocked.
3. Incoming voltage may be too low to drive AVR
electronic systems.
1. Check terminal joints and connections
satisfactorily made.
2. Check incoming cable is of sufficient capacity.
3. Check that cable run not too long causing
excessive volt drop.
1. Check that AVS indicators (if fitted) show 'on'
2. Check that circuit breakers (if fitted) are in the 'on'
position.
Phase rotation problem. Check incoming and outgoing
mains wiring
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