 |
Unique
problems: |
|
Solutions: |
|
| 1)
|
100
% redundant operation upon customer request |
|
Output
"OR"ing diodes on all units |
|
| 2) |
Load
Sharing/ paralleling required |
|
Current
sensing each unit and feedback to the redundant unit with constant
current correction to maintain balance |
|
| 3) |
5
foot output cable to required load and regulated at far end
of cable |
|
Remote
sense circuits at the load with provisions for IR loss down
5 feet of cable length |
|
| 4) |
Live
power "hot swapping" required |
|
Inrush
limiting circuit with 3 second delayed start up |
|
| 5) |
Input
reverse polarity protection required |
|
Input
forward voltage diodes to prevent reverse input voltage and
input shorts which causes loss of hold up time |
|
| 6) |
2
mili-second ride-thru before 20 mili-second hold up time |
|
2
mili-second ride-thru of input power loss before alarming system
|
|
| 7) |
No
air flow available, convection cooling only |
|
Flat
Base Plate design for system bolt down |
|
| 8) |
Output
alarms and power on indicators needed |
|
All
input/output signals monitored and alarmed |
|
| 9) |
Hazardous
Location application |
|
CSA
Class 1 - Div. 2 certification |
|
| 10) |
Output
Over-voltage protection on single and on parallel operation
The converter must sense, at the far end of the cable, which
of the 2 units is in over-voltage and keep the good unit alive
and shut down the bad unit. |
|
Monitoring
circuitry to sense each unit output voltage is done both at
the customer load point and before the internal "or"ing
diodes. These 2 measurements are then compared to determine
which unit is providing the out of tolerance voltage. The lower
voltage unit then sends a shutdown signal to the out of tolerance
unit, there-by keeping the system operational at all times and
preventing any system shutdown or damage. |
Application:
Control Panel for large Turbine engines
