WEG AVR-A-OPT-03, Инструкция по установке, эксплуатации и обслуживанию

Страница: 30 / 79

www.weg.net
l Analog Voltage Regulator AVR-A-OPT-03 30
29 TROUBLESHOOT
Problem Causes Corrective Actions

Circulation of reactive power
between generators when
operating in parallel.

Incorrect phases sequence.

CT connection inverted.

Droop adjustment very low.

Connect the phases sequence correctly.

Polarize CT in phase correctly as it shows below:

Increase droop adjustment, rotating trimpot
clockwise (CW).

Generated voltage decreases
when load is applied, and it
doesn’t return.

The speed is falling at the starting
machine.

U/F limiter acting.

Correct speed regulation.

Adjust U/F limiter, by turning U/F trimpot
clockwise.

Alternatoroutput voltage doesn't
increase.

Residual Voltage is too low.

Terminals F+ and F- inverted.

With the regulator ON, use external battery
(12Vcc) to force excitation. (*)

Invert F+ and F-.

Generated voltage oscillates at a
no load.

Dynamic incorrectly adjusted.

Alternatorexcitation voltage
excessively low.

Adjust voltage trimpot.

Insert 10

/200W resistor in series with field.

Voltage overshoots.

No sensing voltage.

Power circuit damaged.

Sensing voltage incompatible with
the voltage regulator.

Check if the generator’s phases are present in the
sensing voltage.

Change the regulator.

Use one connection that supplies the right voltage
to the regulator.
Alternator
Load
P1
P2
S1 S2