Alpha Technologies Cordex 48-1.2kW - Manual (Page 14)

030-834-J0 Rev A Page 8 of 34
LED Activity During Firmware Upload
When a rectifier firmware upload is in progress, the LEDs behave in the same way as the locate module
command described above.
2.1.3 Mechanical
A locking clip is provided to secure the rectifier into the shelf. During normal operation the rectifier must be
locked into position. A handle (or grip) is incorporated into the front panel to facilitate the removal of the
rectifier from the shelf. A ⅛" x 4 flat head screwdriver is used to lift and release the clip from the locked
position.
2.1.4 True Module Fail Alarm
The power modules have a “true” fail alarm. This provides a true indication of the power module’s ability to
source current. When the module’s output current drops below 2.5% of the rated output a low output
current condition is detected and the Module Fail detection circuit is activated. This circuit momentarily
ramps up the output voltage to determine if the module will source current. If no increase in current is
detected, the Module Fail alarm is activated. The module will test once every 60 seconds for the condition
until current is detected. Output voltage ramping will cease upon detection of current 1 . A minimum 2.5%
load is required to avoid the Ramp Test Fail alarm; this can typically be provided with the parallel system
battery. Activation of this alarm could indicate a failed module or a failed load.
NOTE: For Cordex rectifier systems without batteries (or with a very light load; below 2.5% of rated output) it is
recommended that the ramp test be disabled to avoid nuisance alarms. The Ramp Test feature is
enabled/disabled via the CXC menu item: Rectifiers, Configure Settings.
2.1.5 Heat Dissipation
Cooling of the module is front-to-rear with the exhaust air exiting at the back. The fan is variable speed;
which is determined by heatsink temperature and load.
2.1.6 Over Temperature Protection
Each rectifier module is protected in the event of an excessive increase in temperature due to component
failure or cooling airflow blockage. During over temperature conditions, the rectifier limits the output power
as well as the output current. If temperature continues to increase, a shutdown of the rectifier is initiated.
The rectifier shall restart automatically if the temperature has returned to a safe level.
2.1.7 Wide AC Range
A minor alarm is generated when the AC input voltage drops below specification.
•
Output power is reduced linearly between 176Vac and 132Vac to 60% of the rated output power.
• Input current is limited to less than 6A for operation from 132Vac to 90Vac. Power is derated linearly
between 132Vac (~700W) to 90Vac (~475W).
• At a lower voltage the module will shut down and will not restart until the AC is greater than 90Vac.
• For voltages above 277Vac, power factor and total harmonic distortion may be derated. Up to 320Vac,
the rectifier may not be operational but shall not suffer any damage.
2.1.8 AC Inrush/Transient Suppression
The inrush current of the rectifier module is limited to the full load steady state line current to prevent surge
on the AC line. Modules are also protected from input lightning and transient surges in accordance with
IEEE/ANSI C62.41 Category B3.
1 Under normal conditions, a battery connected to the output of the rectifier will draw current when the voltage ramp occurs. Therefore the rectifier fail alarm will
not be generated with a battery connected.