012-526-B2 Rev C
Page 3 of 20
2
Features
2.1
Converter Module
The Cordex converter modules plug into the Cordex converter shelf. The modules can be installed or removed
from a system without disturbing the system provided sufficient current capacity remains. This is often referred to
as “Hot Swap.”
The total output current capacity of the converter system is equal to the sum of the individual current capacities of
the converter modules.
2.1.1
Alarms
Converter Module Fail
alarms consist of a group of (major) alarm conditions that are considered “serious” or an
immediate threat to service:
•
Converter failure
•
Output fuse failure
•
Converter off
•
Thermal shutdown
•
Input Voltage is out of range
•
Output OVP level has been exceeded.
Converter Minor
alarms consist of a group of alarm conditions that are not an immediate threat to service:
•
Fan fail
•
Current limit.
2.1.2
Indicators
LED indicators are provided on the front panel of the converter module to display the operational status of the
module (see Table A).
Indicator Color
Associated Condition
Green (I/P)
DC INPUT OK
Green (O/P)
Converter Module Power ON
Red (FAIL)
Converter Module FAIL
Red (FAIL flashing)
Converter Minor Alarm
Table A–Module indicators and conditions
2.1.3
Regulation and Paralleling
Cordex modular converters use “output slope” or “regulation offset” to accomplish load sharing. When the
converters are run in parallel (as is the case when more than one converter module is installed in the shelf) it is
necessary to adjust (via the CXC:
software version 1.97 minimum
) the output voltage of the individual converter
modules such that the output current is shared equally between the individual modules. At that point, the modules
will track each other and share the load over the output current range of the units. The output slope value is fixed
at 1.0% (1V / full current range).
2.1.4
Reverse Polarity Protection
The converter design has incorporated reverse polarity protection from the connection to a battery on the input
and to a power source on the output. This prevents damage to the converter circuitry if a reverse connection is
made.
