Operation Manual - Hobart 2400 Compact – 120 / 140 / 180 kVA
Set-up Lock / Output Mode / Compensation
Document no. 578.430AB
Page 53 of 75
4.
Initiate the cable identification process by pressing the output’s
START button.
5.
Within a few seconds, the cable parameters are identified and the ground power unit returns
to Standby Mode.
6.
Remove the Auto Calibration Plug and the ground power unit is ready for use.
Note!
The unit is equipped with 2 outputs, Plug & Play compensation must be set for each output.
Please refer to 7.5 section regarding Output Mode selection.
7.4
Manual Compensation
This is the traditional method of cable compensation. The output voltage is increased in proportion to
the load current (Volt/100 A). This method is used where the influence of non-symmetrical cables,
unbalanced load and varying power factor can be neglected or the Auto Calibration tool isn’t available.
Manual compensation is typically used for ground power units equipped with two outputs that are used
at the same time.
1.
Apply full load to output 1.
2.
Enter the Compensation Type submenu and select “MANUAL”.
3.
Enter the “OUTPUT 1 COMPENSATION” submenu. Press the center button to allow the value
to be adjusted.
4.
Adjust the compensation using the vertical arrow buttons until the voltage at the
aircraft connector equals the no load value. Press the
●
button to accept this value
As the unit is equipped with a second output, repeat the above steps for “OUTPUT 2”.
7.5
Output Mode
The unit is typically delivered with 2 individual outputs. The outputs can be selected as “Individual”
and then only one output can be operated at a time. If “Simultaneous” mode is chosen both outputs can
be operated simultaneously or individually.
Configured as single output, both output contactors operate/close together and the menu point will not
be available.
To obtain the correct operation of the voltage compensation, it is essential that both types of
compensation (Plug & Play and Manual Compensation) have been set beforehand - and for each output.
Note!
An aircraft requires an input voltage of 115V ±3V. The unit can only compensate for a maximum
voltage drop of 14 V since the highest output voltage is limited to 129 V. When extremely long 400 Hz
distribution cables are used, it might be necessary to use parallel output cables to stay within the
required aircraft voltage.
OM2252
Rev 0 December 15 2016
