Doosan G125 - Adjustment Instructions and Testing Procedures

Maintenance Operation & Maintenance Manual
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ADJUSTMENT INSTRUCTIONS and TESTING PROCEDURES
ACCESSING COMPARTMENT
1. Disconnect all electrical loads to the unit.
DANGER
!
High Voltage is present in alternator and control compartments when
engine is running. Battery voltage is present whenever battery is
connected.
2. With engine stopped, remove the plate on the left side or front of the alternator
junction box.
VOLTAGE REGULATOR ADJUSTMENT
Refer to ACCESSING COMPARTMENT Section and Figure 8-1 for locations.
1. With all electric loads disconnected, engine stopped and main breaker turned
on, turn VOLTAGE SELECTOR Switch to 277/480V position, and close and
latch the VSS door.
2. Adjust “Voltage” POT(P2) on regulator to full counterclockwise position.
3. Adjust “Voltage” POT on control panel
to full clockwise position.
4. Start unit.
5. Verify generator frequency to 62-63 Hz at no load on G10 - G40, 60-60.5 Hz on
G60 - G570.
6. Set the VOLTAGE OUTPUT MONITOR switch on the control panel to L
1
-L
2
position.
7. Adjust “VOLTAGE” POT(P2) on the regulator to read 500V on AC voltmeter.
8. Adjust “Stability” POT(P3) counter clockwise until the AC volts within ± 1 volt.
Then turn the adjusting “Stability” POT (P3) some 5-10 degrees clockwise.
9. Adjust “Voltage” POT on control panel to read 480V on AC voltmeter.
10. Stop Generator Set.
11. Check the range in each VOLTAGE SELECTOR switch position (120/208, 120/
240 and 277/480).