Instruction Manual

65
Doc. #: 0260011-J0 Rev B
The LED ashes (~2Hz) when a minor alarm is detected if the module's 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 extinguished in the absence of an alarm. If the unit output is not connected to a
battery or parallel rectier, the LED extinguishes if no AC power is present.
LED Activity During Software Upload
When a rectifier software upload is in progress, the LEDs behave in a distinctly different way to indicate
that new rectifier software is being transferred from the CXC.
When a rectifier data transfer is in progress, all three LEDs flash in a sequence lasting 1.5 seconds. After
the last LED has illuminated, the sequence will repeat starting with the first LED.
LED Activity During Locate Module Command from CXC
When the Locate Module command has been received from the CXC, the LEDs behave in another
distinct fashion that allows the rectifier to be easily identified among adjacent rectifiers.
This state is entered when commanded by the CXC. The LEDs flash in a ping-pong pattern, repeating
every two seconds. During a ping-pong pattern, each LED illuminates sequentially. After the last LED is
illuminated, each LED is illuminated in a reverse sequence. When the first LED is illuminated, the pattern
repeats. This effect makes it appear that the light bounces between the first and last LED.
6.4.2 True Module Fail Alarm
The power modules have a “true” fail alarm that provides a true indication of the ability of the power
module 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 a current is detected. The output voltage ramping will cease upon
detection of current. A minimum 2.5% load is required to avoid the Ramp Test Fail alarm. This can be
provided with the parallel system battery. Activation of this alarm could indicate a failed module or a failed
load.
IF operating the system 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 in the Rectiers > Congure Settings menu item.
NOTE:
6.4.3 Heat Dissipation
Each rectifier module is equipped with one front-mounted fan. The fan runs when temperature is above
0ºC (32ºF). The air flow is front-to-rear with the exhaust air exiting at the back. The fan is variable speed.
The speed is determined by the heatsink temperature and the load.