TM 9-2320-280-34
6-5.2. 400 AMPERE DUAL VOLTAGE AL ERNATOR (12469057) TESTING AND REPAIR (Cont'd)
T
24.
Perform full-load test. Ensure all load switches are in ON position on test stand, and increase
alternator speed to 5000 rpm. Set load to 364 amps/min; record results. Refer to table 6-I, Full-Load
Test, for diagnosis.
25.
Alternator speed and current output tracking values. Refer to table 6-J.
Table 6-I. Full-Load Test.
AMPS
28VDC
14VDC
DIAGNOSIS
322-400
21-25
10.5-12.5
Test bench battery is discharged (or defective).
Allow to charge (or replace).
322-400
26-30
13-15
Charging system OK.
322-400
31-35
15.5-17.5
STOP TEST. Regulator and/or tube assembly
must be replaced. Refer to static testing, task c.
160-238
21-25
10.5-12.5
Alternator and/or regulator must be replaced.
Refer to table 6-K.
160-238
26-30
13-15
Increase load.
160-238
31-35
15.5-17.5
STOP TEST. Test bench malfunction or wiring
error.
Table 6-J. Alternator Speed and Current Tracking.
ALTERNATOR
28VDC
14VDC
ALTERNATOR
28VDC
14VDC
SPEED
OUTPUT CURRENT
OUTPUT CURRENT
SPEED
OUTPUT CURRENT
OUTPUT CURRENT
(RPM)
5 AMP
MINIMUM AMP
(RPM)
5 AMP
MINIMUM AMP
255
50
*3
45
2000
275
30
10
38
**302
3
1200
20
28
*5
10
30
18
70
20
**44
4
3500
200
50
*5
20
350
50
10
30
380
20
1500
50
50
**397
3
100
50
*5
10
140
50
5000
70
20
160
30
TO
200
25
*187
3
8000
350
40
*5
16
380
20
2000
60
30
**397
3
97
50
120
50
* Dependent on ammeter location in test circuit.
**Minimum acceptable current with no load on 28 VDC system.
6-44.16
Change 1
