Hobart 60CU20 Operation And Maintenance Manual With Illustrated Parts List page 96

OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
b Adjust Line-Drop Compensation
Adjustment of line-drop compensation is made with the line-drop compensation
potentiometer. 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:
(i) 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.
(ii) 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).
(iii) 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. Refer to the engine operation manual for
detailed information on the following engine adjustments.
NOTE: A stroboscope is required for engine idle speed checks.
Engine idle speed is programmed at the factory. If adjustment is required, contact the local engine
distributor. The recommended idle speed is 1000 RPM, +/- 25 RPM.
The speed limiting adjustment is also set and sealed at the factory. Speed should be limited to
approximately 2350 RPM. If adjustment is required, contact your local engine distributor.
May 2, 2013 Chapter 2-3
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