Hobart Brothers 6910, Operation And Maintenance Manual With Illustrated Parts List

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G. Power Delivery (Manual Voltage Control)
Power delivery using manual voltage control is the same as automatic delivery [Para. E, (1) thru (5)
above] except:
(1) Control generator output voltage by adjusting the rheostat
(32)
to maintain a steady 115-V AC
reading on the voltmeter (2). Turn the rheostat (32) knob CLOCKWISE to INCREASE voltage and
COUNTERCLOCKWISE to DECREASE voltage.
(2) Adjust voltage to 115 V AC.
(3) During manual power delivery the operator must remain with the generator set to adjust output
voltage for varying loads and conditions.
H. Discontinue Power Delivery
(1) Place load contactor switch (20) in OFF position. Green light (22) should go OFF immediately to in-
dicate that load contactor has opened and power is no longer being delivered to the aircraft.
(2) Place engine-generator control switch
(18)
in IDLE position.
(3) Disconnect output cable from aircraft.
WARNING: HIGH VOLTAGE - ELECTRIC SHOCK OR FIRE CAN KILL! NEVER
DISCONNECT THE OUTPUT CABLE WHILE POWER IS BEING DELIVERED.
K. Stopping the Engine
(1) Allow the engine to idle a few minutes before stopping, to permit cooling.
(2) To stop the engine, move the START-RUN-STOP switch
(30)
to the STOP
(down)
position.
3. Test Box Operation
The test box is useful and convenient in testing the generator set after repair or overhaul and also in
trouble shooting. To operate the test box, proceed as follows:
A. Open left, rear canopy doors and connect the test box plug connector (see 1-1; 3, Fig. 14) to the
test receptacle connector (Fig. 4).
B. Connect the test prods of a voltmeter at the test jacks (3 and 4, Fig. 3). Test jacks are color coded.
RED indicates POSITIVE. BLACK indicates NEGATIVE.
C. Locate the component or circuit to be tested in the DESCRIPTION column on the instruction plate
and set the selector switch
(1, Fig. 3) to the number indicated opposite the description.
D. Note the normal voltage value and kind of current (AC or DC) to be expected at the position and
set voltmeter accordingly.
E. Comply with conditions indicated in CONDITIONS column for the particular test being performed.
F. Press the pushbutton switch (2) and observe voltage indicated by the voltmeter. Compare to nor-
mal voltage indicated in VOLTAGE column.
G. Release pushbutton switch.
H. Repeat steps A thru G for other test as required.
J. When tests are completed, disconnect the test equipment and close canopy doors.
OM-2028
August 31/90 Revised 1-3
Page 7