Guardian Technologies 4758 - Manual (Page 38)

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
T
E
S
T
4
R
E
S
U
L
T
S
-
F
IX
E
D
E
X
C
IT
A
T
IO
N
T
E
S
T
/R
O
T
O
R
A
M
P
D
R
A
W
T
E
S
T
Results:
(Model #)
ABCD
E
F
G
H
Voltage Results
ALL
A
bove 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
A
bove 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
MM
AA
TT
CC
HH
RR
EE
SS
UU
LL
TT
SS
WW
IITT
HH
LL
EE
TT
TT
EE
RR
AA
NN
DD
RR
EE
FF
EE
RR
TT
OO
FF
LL
OO
WW
CC
HH
AA
RR
TT
OO
NN
PP
AA
GG
EE
22
..33
-11
&&
22
..33
-22
““PP
rroo
bb
llee
mm
11
””