Installation Guide

2022.02 / l
9
Electric Power Generation
Installation and maintenance
R120
AVR
5243 en -
8 - MULTIMETER CHECKS
Equipment: Digital multimeter, Type:
MECO or equivalent.
Select Diode mode on the digital multimeter.
The resistance between F1 and F2 (with the
multimeter jack common applied to F1 of the
AVR) should be between 0.4 and 0.6 kΩ,
and vice versa (with the multimeter jack
common applied to F2 of the AVR) should
give INFINITY.
ZERO indicates a power device failure in
both cases, No further tests (static or
dynamic) are allowed, as they would lead to
the fuse blowing.
The resistance between F2 and U (both
sides) should be 180 kΩ.
The resistance between F2 and V with the
multimeter jack common applied to the AVR
V terminal should be approximately 2.2 MΩ
in the 10 MΩ range and vice versa (with the
multimeter jack common applied to the AVR
F2 terminal) should be 15 MΩ.
ZERO indicates a power device failure in
both cases, No further tests (static test or
dynamic tests) are allowed, as they would to
the fuse blowing.
The resistance between U and V should
be between 300 kΩ and 400 kΩ. Open
circuit indicates AVR failure. During a static
test, the lamp will not turn OFF or, when
connected to the generator, it will produce a
ceiling voltage (for 3-phase ONLY).
The resistance between U and N1 should be
between 200 kΩ and 260 kΩ. Open circuit
indicates AVR failure. During a static test,
the lamp will not turn OFF or, when
connected to the generator, it will produce a
ceiling voltage (for 1-phase ONLY).
The resistance between N and F1 should be
very low or ZERO ohms. If the circuit is
open, the lamp will not glow when the static
test is performed.