Alpha Technologies AMPS80 HP - Manual (Page 75)

73 Doc. #: 026-069-B0 Rev F
6.4.2 LED Activity During Rectifier 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.
6.4.3 LED Activity During Rectifier ‘Locate Module’ Command from
Controller
When the ‘locate module’ command has been received from the CXC, the LEDs will behave in another dis-
tinct 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 se-
quence. 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.
6.4.4 True Rectifier 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 Current1. 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.
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.