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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
- 7 -
3.4
SYSTEM CONTROL (continued)
System control consists of one System Controller Board, a measurement board, one Operator Display as
For remote indication, potential-free contacts (change-over type), which can be programmed on the
Control Panel for operational and fault signals as required, are available on the Customer Interface Card
(I/O-board).
3.5
SAFETY AND PROTECTION
The design philosophy for the 28V DC GPU is that it will endeavor to protect itself at all times. Self-
protection is incorporated in both the hardware and software designs. Where situations arise that could
either cause damage to the converter, or endanger the output load, the general rule is to disconnect
and/or shutdown.
For safety of personnel, an Emergency Stop button is fitted local to the Control Panel on the front of the
converter cubicle.
3.6
CONTROL AND MONITORING
3.6.1
Power Supplies for Controls & Monitoring
All the electronic cards within the converter receive their power via a transformer from a DC
Power Supply Board designated A211.
3.6.2
Internal System Control
Figure 2 shows the connection plan of the
control boards within the converter. System
Controller, Customer Connection board
(optional) and Protocol Gateway (optional)
are connected via an internal CAN-Bus.
Each board has its own micro-processor
which controls specifically relevant
functions.
System Controller Board A100 has the
function of complete system control. In
addition, every internal event will be
recorded and saved by the Event Memory in
chronological order. A remote control panel
can be plugged in via an additional interface.
Control Panel A240 consists of control and
display elements for the user. Commands
are analyzed by the system controller and interpreted into actions. Measurement values for the
input and output circuits are processed and displayed.
3.6 Control and monitoring continued on following page.
A100
System
Controler
Board
A211
Power supply/
Voltage regulator
A110
Measurement board
A010
Firing board
A230
IO Board
Opton
A260
Protocol Gateway
Option
A240
Control Panel
Figure 3.6.2 - Internal Cotrols
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