012-554-B2 Rev D
Page 5 of 16
2.9
Input Low Voltage Lockout
The converter module is electronically protected from low voltages at the inputs by fault detection circuitry. If the
input to the converter module falls below the lower DC input limit (see Specifications), the module will shut down
and enter converter fail mode.
2.10 Regulation and Paralleling
Alpha modular converters use “output slope” or “regulation offset” to accomplish load sharing.
2.11 Over Temperature Protection
The converter module is protected in the event that it is operated in excessive ambient temperatures or if the
cooling airflow is compromised such as that caused by airflow obstruction or operation at high altitudes. Under
these conditions the converter will shut down causing the corresponding OUT LED to flash. Normal outputs will be
returned automatically if the ambient temperature is reduced.
2.12 Ventilation
Cooling of the converter module is achieved via bottom to top natural convection and/or forced air-cooling. To
maintain proper operation over the full temperature range (see Specifications), allow at least one rack space
above and below the converter shelf with airflow baffles deflecting any heated air away from the input (bottom) of
the converter shelf. The 4-module shelf has an integrated fan.
2.13 Paralleling Diode
Converter modules are equipped with a paralleling diode to ensure uninterrupted operation of the system in case
of failure of one converter module.
2.14 Reverse Polarity Protection
The converter design has incorporated reverse polarity protection from the connection to a power source on the
input. This prevents damage to the converter circuitry if a reverse connection is made.
CAUTION
To ensure some measure of safety, it is recommended to wire the shelf with correct polarity on all
inputs as measured at the front panel test points.
