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Alternator Operation and Diagnosis
118
Test 1 - Determine if Problem is in
Controller or Alternator
1. Need to put the genset in a non-excitation
condition. Unplug the water temperature
sensor and connect a spare sensor with a
temperature of 29 C (85 F) or below. If no
spare sensor is available connect a 1500 -
1550 ohm resistor across the WTS and WTN
wires.
NOTE: NOTE: Units with Eco Power will
run in Low speed 400 V 50 Hz operation.
2. Disconnect the J6 (green) connector from
controller
3. Start the genset and let run for 1-2 minutes.
Check for residual AC voltage at T1-T2,
T1-T3, and T2-T3. Reading should be 50 to
120 VAC.
a. If residual voltage is present problem is in
controller. Go to Test 2.
b. If low or no residual AC voltage is
present, magnet in exciter stator may have
lost its magnetism and the field needs to
be flashed. Disconnect F1 and F2 wires
from J6 connector in control box. Using a
jumper wire connect F2 to GRD stud. Start
genset. Using a jumper wire connect the
F1 wire to J9 terminal or 12 Vdc. Check
for AC voltage output on T1-T2, T1-T3,
T2-T3, should be 400 VAC or higher. If
AC voltage is present problem is in
controller. Go to Test 2. If still no AC
voltage problem is in alternator, go to Test
3 and Test 4.
c. If the unit has add on F1/F2 circuit board,
remove the board and repeat step b. If AC
voltage is now present replace the F1/F2
circuit board. If still no AC voltage
problem is in alternator, go to Test 3 and
Test 4.
Test 2 - Controller Excitation Test
1. Make sure unit is in the excite condition, J6 is
connected and water temperature is above
32 C (90 F). Measure the voltage across the
battery and record (12.5 Vdc).
2. Remove and check the 30 amp battery charger
fuse S12. With the fuse removed from the
controller start the unit and measure voltage at
terminals J15 and J16 located under blue cap.
See photos below. If the voltage is 16.1 to 16.8
Vdc, the controller is good. If voltage is the
same has battery voltage, replace controller.
Reinstall the battery fuse S12 and take the
same readings at J15 and J16. If voltage
reading is 16.1 to 16.8 Vdc, check the CH (10
ga) wire from J11 to the engine frame.
Figure 94: Check Voltage Between J15 and J16
1.
Blue Cap
Figure 93: Remove Blue Cap
1
Содержание SGCO 3000
Страница 4: ......
Страница 12: ...SGCO 3000 Genset Addendum 12...
Страница 14: ...Genset Model Features 14...
Страница 22: ...Service Guide 22...
Страница 32: ...Unit Description Features Options 32...
Страница 78: ...Operating Instructions 78...
Страница 86: ...Electrical Maintenance 86...
Страница 114: ...Engine Maintenance 114...
Страница 124: ...Alternator Operation and Diagnosis 124...
Страница 130: ...Structural Accessory Maintenance 130...
Страница 138: ...Index 138...
Страница 140: ...Electrical and SG Menu Flow Diagrams 140...
Страница 141: ...141 SGCO 3000 Wiring Diagram Page 1 of 1...
Страница 142: ...142 SGCO 3000 Schematic Diagram Page 1 of 1...