Thermo King SGCO 3000, Руководство пользователя

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Alternator Operation and Diagnosis
119
Test 3 - Testing Alternator
1. Make sure software is 3.8.1 100325 or higher.
2. Connect J6 connector and water temperature
sensor. Start unit, no load and water
temperature >90? F.
3. Go to DATA MENU/ANALOG INPUTS and
read the FIELD CURRENT. If higher than 0.5
Amps problem is in the alternator. Go to Test
4 and Test 5.
Figure 95: DATA MENU/ANALOG INPUTS
Test 4 - Alternator Exciter Field
Testing
1. Disconnect the field wire F1 and F2 from the
J6 or at the plug in the control box. Measure
the resistance of the field circuit (F1 to F2).
The standard value is 13.9 (±10%) ohms at 77
F (25C). If field is open or resistance value is
low replace exciter field 45-2301.
2. Measure F1 or F2 to GND for possible shorted
to ground coils. Megger F1 to stator case to
check for insulation break down, @ 500 Volts
must be more than 1 M ohm.
Test 5 - Alternator Stator Testing
Test 5 covers testing the main alternator stator, the
rotating rectifier, the rotating exciter field, and the
rotating field armature.
1. Main alternator stator windings
a. Disconnect the stator leads from the
terminal board and ground stud in the
control box. Check for continuity between
the following pairs. T1-T4, T2-T5, T3-T6,
T7-T10, T8-T11, T9-T12. The resistance
between any of the pairs should be 0.114
(±10%) ohms at 25 C (77 F).
b. Using a megger meter, check for
insulation break down between each pair
of leads to the stator case. @ 500 Volts
must be more than 1 M ohm.
c. Remove the end bell for the remaining
checks
2. Rotating Rectifier
Six rectifying diodes are mounted on the rotating
exciter field, three are positive and three are
negative.
a. Unbolt each of the exciter armature leads.
b. Unbolt the main field armature leads.
Along with the main field armature leads
are leads to a MOV. The MOV is a high
VOLTAGE MEAS. 460 V
FIELD CURRENT 1.1 A
WATER TEMP. 92ºC
RUNNING FREQ. 60Hz
1. Disconnect all 12 stator leads to test
the stator.
Figure 96: Alternator Stator
1. Disconnect the main alternator field
leads to test the diodes.
Figure 97: Rectifying Diodes
AJA2089
1
AJA2090
1