Alpha Technologies CXPS-HD 48-1.2-225 - Manual (Page 15)

0530082-J0 Rev B Page 7 of 31
2.5.1.2 DC
The middle green LED illuminates continuously when the rectifier is delivering power to the load. It flashes when
communication is lost. This LED is off when the rectifier is off, for example when the rectifier is switched off by the
controller.
2.5.1.3 Alarm
The bottom red LED illuminates continuously during an active Module Fail alarm. It flashes when a minor alarm is
detected. This LED is off when there are no alarms, no AC input power, or if the rectifier is not connected to a
battery or another parallel rectifier.
2.5.1.4 Locate Module command
When the Locate Module command has been received by the rectifier from the controller, the LEDs flash in a
distinct pattern, repeating every 2 seconds.
2.5.1.5 Firmware upload
When a rectifier firmware upload is in progress, the LED lights behave the same as during the Locate Module
command.
2.5.2 Mechanical connections
A locking clip is secures the rectifier into the shelf. The rectifier must be locked into position during normal
operation. A handle or grip is incorporated into the front panel to help remove the rectifier from the shelf. A ǩ" x 4
flat head screwdriver is used to lift and release the clip from the locked position.
2.5.3 Rear panel
Connections for the shelf power and communications are located on the rear panel of the rectifier.
2.5.4 True module fail alarm
The rectifier modules use a “true” fail alarm. This provides a true indication of the module’s ability to source
current. When a 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 in
an attempt to increase the output current. If no increase in current is detected, the Module Fail alarm is activated.
When the Module Fail alarm is activated, the rectifier will check the output current once every 60 seconds until the
current is within the rated output. Output voltage ramping will then cease when the current reaches the rated
range. Under normal conditions, a battery that is connected to the rectifier output will draw current during a
voltage ramp up. A rectifier fail alarm will therefore not be generated when a battery is connected.
A minimum 2.5% load current is required to avoid a module fail alarm; but a bank of parallel batteries will typically
draw this much current. Activation of this alarm could indicate a failed rectifier module or a failed load.
To avoid nuisance alarms, disable the Ramp Test feature for rectifier systems without batteries or with a load;
below 2.5% of the rated output. Use the Rectifiers > Configure Settings menu on the controller to
enable/disable the Ramp Test.
2.5.5 Heat dissipation
Each rectifier module is cooled by a variable-speed fan. The speed of the fan is governed by a temperature
sensor on the heat sink. The cooling air enters the front of the module and exits the rear of the module.
2.5.6 Over-temperature protection
Each rectifier module is protected against an excessive increase in temperature caused by a component failure or
blockage of the cooling air. During an over-temperature condition, the rectifier limits the output power and the
output current. If the temperature continues to increase, a shutdown of the rectifier is initiated. The rectifier
restarts automatically when the temperature returns to a safe level.
2.5.7 Wide AC input power range
A minor alarm is activated when the AC input voltage drops below a specified value. The output power is reduced
linearly between 176 Vac and 132 Vac to 60% of the rated output power. The input current is limited to less than
6 A for operation between 132 Vac and 90 Vac. A constant output power of 600 W is available between 132 Vac