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
- 6 -
3.2
DETAILED DESCRIPTION (continued)
displayed as well as the output voltage and current on the LC Display by pressing the “up” or “down” push
buttons. Access to the system set-ups can be gained via the LC Display using the ‘up’ and ‘down’ buttons
below the display. The Event Memory can also be interrogated from this Control Panel, which permits
fault investigation to be carried out from the Control Panel. The system software in the Controller board
(described later) can be accessed via a laptop PC using the built-in On-line Monitoring facility. Remote
Indications for the Customer’s own use, are available via a set of programmable relays. Potential-free
contacts, ‘normally-open’ and ‘normally-closed’ can be programmed for each alarm or operating
condition.
3.3
PERFORMANCE UNDER UNUSUAL CONDITIONS
Overload - The converter can deliver up to a maximum of 2000 A for 10sec. At higher overloads the
output current is limited. The converter is switched off if the output voltage falls below the permissible
tolerance.
Short-circuit on the load busbar - In principle, a short-circuit occurring on the output side is handled
similar to an overload, except that the output voltage is very low. The output power will be limited as
described above for an overload. The rectifier itself has short-circuit protection.
Mains fault - If the mains supply is outside permissible tolerances, it is not possible to start the system, in
which case all LED’s on the mimic display are switched off. If the converter is running and the mains
supply goes out of the permissible tolerances, the converter will switch off within 50ms.
Output fault - The converter monitors the output voltage continuously. If it exceeds the permissible
tolerances the unit is switched off.
Over-temperature - In the event of a fan failure, the system continues to run normally until the over-
temperature protection cuts in. An over-temperature warning is generated first and the system is switched
off shortly afterwards when the maximum permissible temperature is reached.
3.4
SYSTEM CONTROL
System control consists of one System Controller Board, a measurement board, one Operator Display as
an integrated part of the System Controller Board.
The System Controller Board handles the master system control function. Control commands from the
Control Panel CP are transmitted to this controller, evaluated and converted into the appropriate actions.
Current operating parameters (measured values etc.) are also evaluated by the System Controller Board
and sent back to the CP, to displays them via the LC Display. The following measure values are not only
displayed, but are also monitored for deviations from the specification:
•
Input under & over-voltage
•
Input phase rotation
•
Output under & over-voltage
•
Output overload
•
Over-temperature
The System Controller Board also controls the regulation of the converter output voltage and current
Operation events are shown on LC display and will be saved in the event memory in chronological order
with date and time. If it is necessary, these events can be accessed via the LCD or the serial interface.
Содержание 11A6647-1000
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