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28.5 VDC Ground Power Unit
Models:
11A6647-1000/1010
11B6647-1000/1010
11C6647-1000/1010
11D6647-1000/1010
11A6647C1000/1010
11B6647C1000/1010
11C6647C1000/1010
11D6647C1000/1010
11A6655-1000/1020
11B6655-1000/1020
11C6655-1000/1020
11A6655C1000/1020
11B6655C1000/1020
11C6655C1000/1020
11D6655C1000/1020
11A6665-1000/1010
11B6665-1000/1010
11C6665-1000/1010
11A6666-1000
11B6666-1000
11C6666-1000
12/2006 - Rev. 04
- 10 -
3.7.2
I-Boost Compensation (continued)
Adjustment of the unit due to correction factors
As described above, a factor is necessary to adjust the I-Boost. The factor depends on the length
and the type of the cable and on the load current. The following table shows the correction factor
for different types of cables. Use the formula below to calculate the correct adjustment values.
TYPE OF CABLE
FACTOR (mV/A m)
2 x 95 mm
2
.................................................... 0.44
2 x 120 mm
2
.................................................. 0.35
The correct adjustment value is calculated in the following way: Multiply the correction factor for
the type of cable, the nominal (full load) current and the length of the cable then divide the result
by 1000 to get the adjustment value (round to the nearest whole digit).
Example: The cable type is 2 x 95 mm
2
, the length is 10 m, and the nominal current is 600A
The calculation of the value is:
•
Calculation for the adjustment: (0.44mV/Am x 600A x 10m)/1000 = 2.64V
•
Value to be adjusted for Active Power is: 3V
3.8
CONTROL PANEL
There is a local Control Panel on the cubicle door of the converter (Figure 3.8) which contains a mimic
display with multi-aspect light emitting diode (LED) indications, an 80-character liquid crystal (LC) display,
on/off buttons, up/down buttons, reset and lamp test buttons.
3.8.1
Mimic Display
The Mimic Display on the Control Panel gives the user a quick and comprehensive status
indication of the converter. Each of the following main functions of the converter has an LED
associated with it on the mimic diagram:
•
Mains Input
•
Static switch
•
Rectifier
•
Output
•
Attention
!!!!
R
Figure 3.8 – Control panel