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
- 4 -
2.0 TECHNICAL DATA (continued)
28V DC GPU 600A
Dimensions
Cabinet
(w/o holders/wheels)
Width mm / IN
953 / 37.5
Depth mm / IN
753 / 29.6
Height mm / IN
757 / 29.8
Overall
(with wheels, holders and cables)
Width mm / IN
1384 / 54.5
Depth mm / IN
753 / 29.6
Height mm / IN
1105 / 43.5
Weight
Cabinet
270 kg / 595 lbs.
Cabinet
(with wheels, holders and cables)
331 kg / 730 lbs
Paint finish
RAL 7032
Protection type
IP54 / Nema 3R
3.0 SYSTEM DESCRIPTION
3.1
INTRODUCTION
The 28V GPU is manufactured using the latest state-of-the-art technology. The design concept and the
selected components utilize the latest trends in power electronics, and represents the best solution for the
different problems of Ground Power Supplies. The 28V GPU is built with output voltage regulation and
load current limiting. The following block diagram shows the principle.
The circuit breaker Q1 at the input protects the system and is used to isolate the unit. There is a filter
(EMC) at the input, which limits the electrical emissions (RF) back to the mains, thereby ensuring that the
equipment meets various EMI requirements. Secondary supplies to feed control circuits, switched via
Q100, are also connected at the input. This ensures that even when the unit is shut down, the control and
monitoring circuits remain operational.
Control voltage AC
Q100
Q1
C60-64
A6
T6
A010
A100
A110
EMC
T1-3
M1
V1-3
Mains
28V DC
A11
T211
Control voltage DC
A211
T212
X200
EMC
A12
K001
option