Hobart 6824-1, Operation And Maintenance Manual, Page: 49 / 214

e. Power Delivery (Automatic Voltage Control)
(1) Place engine-generator control switch (18, Fig. 1) in BUILD-UP-VOLTAGE position
momentarily, then allow it to position itself in GEN position. The electric governor will
immediately increase engine speed to 2000 RPM and maintain it.
(2)
Observe generator instruments. Frequency meter
(1, Fig. 1)
should indicate exactly 400 Hz.
Voltmeter (2) should indicate 115 V AC when line switch (6) is in LINE-TO-NEUTRAL position.
(3) The final step in delivering power is closing the load contactor. When satisfactory frequency and
voltage values are indicated by the instruments, close the load contactor by momentarily placing
the load contactor control switch
(20) in the top (spring loaded), CLOSE position. The green
indicating light (22) should glow at once to indicate that the load contactor is closed and power
is available at the aircraft. As soon as the light glows, release the switch. It will automatically
return to the center ON position.
NOTE: If the indicating light (22) should “go-out” as soon as the switch is released, and no fault lights are ON,
it indicates that 28.5-V DC holding current is not being supplied from the aircraft to the plug-interlock
relay. Correct the condition an again operate the load contactor control switch (20) as above.
(4) It is recommended that the operator check output voltage and current in each of the three
phases early in the power delivery run. Use the meter switch
(5)
to select the phase. Use the
line switch (6) to select line-to-line or line-to-neutral voltage. If the load is changing, it is good
operating practice to observe the instruments until load conditions stabilize.
1. Clamp screw
2. Fluid cylinder
3. Cap
4. Plug
5. Valve
Cold Weather Starting Aid
(Optional)
Figure 2
OM-499
May 31/94 Revised 1-3
Page 5