2018.01 / g
9
Electric Power Generation
Installation and maintenance
R150
AVRs
5384 en -
8 - MULTIMETER CHECKS
Equipment: Digital multimeter.
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 V, 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 k
W
.
The resistance between F2 and V (with the
multimeter jack common applied to the AVR
V terminal should be approximately 2. 2 M
W
in the 10 M
W
range and vice versa (with the
multimeter jack common applied to the AVR
F2 terminal) should be 15 M
W
.
ZERO
indicates 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 300 k
W
to 400 k
W
. Open circuit indicates
AVR failure. During a static test the lamp will
not turn OFF or, when connected to the
generator it will produce ceiling voltage (for
3-phase ONLY).
The resistance between U and N1 should be
between 200 k
W
and 260 k
W
. 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.
