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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
- 31 -
5.0 OPERATING INSTRUCTIONS (continued)
5.3
OPERATING THE SET
In the following drawings, LED’s are shown thus:
Since the converter can limit the output current, the current limiting switch S003 has to be adjusted,
before the unit is switched on. The limit switch is a four-position switch, each position limits the output
current to the value indicated on the following drawing.
In addition to this switch, the output current can be limited to lower values by using the internal OUTPUT
CURRENT DC setup entry (see Section5.3.14). Since the internal current limiting adjustment is
prioritized, it has to be adjusted to “unlimited” in case the load requires more than the nominal current. In
this case the output current limit will be limited to a value adjusted with S003.
5.3.1
Switching On
NOTE:
Before switching the set on for the first time after installation, check that the cabling has
been correctly installed. It is absolutely imperative that the phase sequence of the AC
connections is correct since incorrect connections can cause damage to the system.
1. Check that the yellow “Input”, “Static switch” and “Rectifier” LED’s come
on, i.e. that mains supply is available. Only then should the system be
switched on.
2. Press the “Shift” and “On” push buttons simultaneously.
The following messages appear one after the other in the event display
menu:
“On push button contact closed”
“Static switch on”
The following LED’s should be lit up on the mimic panel:
“Input”
green
“Static switch”
green
“Rectifier"
green
“Output”
green
5.3 Operating the set continued on following page.
0 900A
1 1200A
2 1500A
3 2000A
0
1
2
3
Figure 5.3
Current Limiting Switch S003
600A Unit
red flashing
green steady
red steady
green flashing
yellow flashing
yellow
off