9-9
PRIMARY EXCITING CIRCUIT
As described in
5-3
DESCRIPTION
of
GENERATOR OP-
ERATION,
the primary exciting coil is in the magneto
mounted on the engine, and the AVR has a circuit for it.
9-9-1
EXCITING COIL
The normal inter-terminal resistance of the exciting coil is
about
10
to
30
ohms.
Its voltage at the rated rpm is about
AC
10
to
30
V.
Check the resistance and voltage with a test-
er to see if they meet these requirements.
9-9-2
OTHERS
No
output voltage from the generator.
Fig.
9-
10
If the trouble cannot be detected by Step
9-9-
1
above, check the primary exciting circuit as follows:
A. Disconnect the control box and operate the generator at the rated rpm. Disconnect the two yellow wires from the excit-
ing coil to the AVR, and momentarily connect the positive
(+)
and negative
(-)
leads of a battery
in
their place. If no
output voltage is generated, reconnect the battery leads the other way.
If
output voltage is generated, the exciting coil is
defective.
B.
If no output voltage is generated by the test conducted as desribed in Step A., operate the generator at the rated rpm
and momentarily connect a battery to the brushes. The green lead is positive
(+)
and the black or brown lead negative
(-)
(See Fig.
9-1
1.).
If output voltage
is
generated, the primary exciting circuit in the AVR is defective. Replace the
AVR.
Fig.
9-
11
-38-
~
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