Alpha Technologies CXPS 48-1.8-M2, 48V Pos Gnd - Manual (Page 22)

Argus Technologies Ltd. 053-991-C0 Rev A WC
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The LED will flash (~2Hz), when a minor alarm is detected, if the modules output capability has
been reduced or a minor component failure is detected during the following conditions:
VAC meter fail AC foldback Remote equalize
Fan fail Low output voltage High output voltage
Current limit (programmable option) Power limit (programmable option) High temperature foldback
Temperature sense fail Soft start operation Communications lost.
The LED remains off in the absence of an alarm. If the unit output is not connected to a battery
or parallel rectifier, the LED will extinguish if no AC power is present.
2.4.1.4 LED Activity During Software Upload
When a rectifier software upload is in progress, the LEDs will behave in a distinctly different way
to indicate new rectifier software is being transferred from the CXC.
When a rectifier data transfer is in progress, all three LEDs will flash in a sequence lasting 1.5
seconds. When the last LED is lit, the sequence is repeated beginning at the first LED.
2.4.1.5 LED Activity During ‘Locate Module’ Command from CXC
When the ‘locate module’ command has been received from the CXC, the LEDs will behave in
another distinct fashion so that the rectifier is easier to visually identify among adjacent
rectifiers.
This state is entered when commanded via the CXC. The LEDs will flash in a ping-pong pattern
repeating every 2 seconds.
The ping-pong pattern lights each LED sequentially. After the last LED is lit, each LED is lit in
reverse sequence. When the first LED is lit, the pattern repeats. The effect makes it appear as if
the light is bouncing between the first and last LED.
2.4.2 Mechanical
A thumbscrew (1/4-turn) latch is provided to secure the rectifier into the shelf. During normal operation the rectifier
shall be locked into position. A handle (or grip) is incorporated into the front panel to facilitate the removal of the
rectifier from the shelf. No special tools are required.
2.4.3 Rear Panel
Located on the rear panel of the rectifier are connections for shelf power and communications.
2.4.4 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.
2.4.5 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.
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.