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SECTION 2.4
DIAGNOSTIC TESTS
AC GENERATORS
TEST
4-
FIXED
EXCITATION
TEST
/ROTOR
AMP
DRAW
TEST
DISCUSSION:
Supplying a fixed DC current to the rotor will induce a
magnetic field in the rotor. With the generator
running, this should create a proportional voltage
output from the stator windings.
PROCEDURE:
1. Disconnect Wire 4 from the voltage regulator, 3rd
terminal from the top. See Figure 3.
2. Connect a jumper wire to the disconnected Wire 4 and
to the 12 volt fused battery supply Wire 15. (located at
15A fuse).
Figure 3. Voltage Regulator
3. Set VOM to AC volts.
4. Disconnect Wire 2 from the excitation circuit breaker
(CB2) and connect one meter test lead to that wire.
Disconnect Wire 6 from the voltage regulator and
connect the other meter test lead to that wire. (5th
terminal from top, double check wire number).
5. Set the AUTO-OFF-MANUAL switch to MANUAL. Once
the engine starts, record the AC voltage.
6. Set the AUTO-OFF-MANUAL switch to OFF.
Reconnect Wire 2 and Wire 6.
7. Disconnect Wire 11 from the voltage regulator and
connect one meter test lead to that wire. Disconnect
Wire 22 from the voltage regulator and connect the
other meter test lead to that wire (both wires are located
at the top two terminals of the voltage regulator, see
Figure 3).
PART 2
Page 2.4-3
TEST
4
RESULTS
-
FIXED
EXCITATION
TEST/ROTOR
AMP
DRAW
TEST
Results: (Model #) ABCDEFGH
Voltage Results ALL Above 60 VAC Above 60 VAC Below 60 VAC Zero or Below 60 VAC Below 60 VAC Above 60 VAC Below 60 VAC
Wire 2 & 6 Residual Volts
Voltage Results ALL Above 60 VAC Below 60 VAC Above 60 VAC Zero or Below 60 VAC Below 60 VAC Above 60 VAC Below 60 VAC
Wire 11 & 22 Residual Volts
Static Rotor 4389-4758-4679 0.91-1.06A 0.91-1.06A 0.91-1.06A Zero Above 1.5A 0.91-1.06A Zero 0.91-1.06A
Amp Draw 4456-4759 0.80A 0.80A 0.80A Current Above 1.3A 0.80A Current 0.80A
4390-4760 0.64A 0.64A 0.64A Draw Above 1.1A 0.64A Draw 0.64A
4692 0.71-0.82A 0.71-0.82A 0.71-0.82A Above 1.3A 0.71-0.82A 0.71-0.82A
Running Rotor 4389-4758-4679 0.91-1.06A 0.91-1.06A 0.91-1.06A Zero Above 1.5A 0.91-1.06A Zero Above 1.5A
Amp Draw 4456-4759 0.80A 0.80A 0.80A Current Above 1.3A 0.80A Current Above 1.3A
4390-4760 0.64A 0.64A 0.64A Draw Above 1.1A 0.64A Draw Above 1.1A
4692 0.71-0.82A 0.71-0.82A 0.71-0.82A Above 1.3A 0.71-0.82A Above 1.3A
GO TO Test 5 Test 7 Test 7 Test 8 Test 10 Test 7 Test 8 Test 10
MMAATTCCHH RREESSUULLTTSS WWIITTHH LLEETTTTEERR AANNDD
RREEFFEERR
TTOO
FFLLOOWW
CCHHAARRTT
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PPAAGGEE
22..33-11
&&
22..33-22
““PPrroobblleemm
11””