Hobart 60CU24, Operation And Maintenance Manual With Illustrated Parts List, Page: 92 / 234

OM-2098C / Operation and Maintenance Manual
60CU24 / Series 500060C / 400 Hz. Generator Set
April 01, 2005 Chapter 2-3
Page 14
(1) Output Voltage Adjustment
a Adjust Voltage Control
The output voltage, at which the generator is regulated, is adjustable by the fine voltage
adjustment potentiometer (Figure 8)
. Turn the potentiometer adjustment clockwise to
increase generator output voltage, and counterclockwise to decrease voltage.
Observe the output voltage as indicated by the voltmeter, located on the control panel of the
generator set. Set output voltage at 115-V AC line-to-neutral (200-V AC line-to-line).
b Adjust Line Drop Compensation
Adjustment of line drop compensation is made with the line drop compensation potentiometer
(Figure 8). Turning the potentiometer knob clockwise increases the magnitude of the
compensation, and turning the potentiometer knob counterclockwise decreases the
magnitude (A graduated nameplate for specified cable lengths is included for quick
reference.). To adjust the line drop compensation, proceed as follows:
•
Connect the generator set output cables to a load. Load the generator set with the
largest available three-phase load of rated power factor not exceeding the maximum
rating of the generator set.
•
Measure output voltage at the load end of the cables. If the load voltage rises or drops
more than 1% at the load end of the cables, decrease or increase the line drop
compensation until the regulation is flat (115-V AC line-to-neutral and 200-V AC line-to-
line).
•
If the line drop compensation adjustments have affected the no-load voltage output,
adjust the fine output voltage control potentiometer to the desired value.
(2) Test the Voltage Regulator
After necessary adjustments have been completed, re-test the voltage regulator as follows:
a Connect a voltmeter at the load end of the generator output cables.
b Operate the generator set at no-load and observe voltage reading.
c Operate the generator set under load and observe voltage reading.
d Voltage under load and no load should vary no more than 1% at the load end of the cables.
c) Basic Engine Adjustments
Adjustment procedures applicable to the diesel engine are included in the engine manufacturer’s
operation manual, which is referenced in Chapter 5. Specific information for these engines is listed in
Figure 2. Refer to the engine operation manual for detailed information on the following engine
adjustments.
(1) Exhaust valve adjustment
(2) Fuel injector timing adjustment
(3) Engine idle speed adjustment