• Over-Temperature Protection: The rectifier provides over temperature protection by
derating output power and recovers automatically.
• Active Load Sharing: The rectifier uses advanced digital active load sharing technology that
maintains balancing to within 3% of rated current.
• Hot Swappable: The rectifier is designed to be plug-and-play. The rectifier can be inserted
or removed from a live DC power system with no damage. When the rectifier is plugged into
the system, the system output voltage will not be affected.
• Cooling: Each rectifier module contains a fan for front-to-back force air-cooling.
a) Fan Fault Protection: The rectifier module shuts down and its alarm indicator (red) flashes
if the fan fails. Fan failure is detected and reported to Controller. The fan is field
replaceable.
b) Fan Control: Fan speed is continuously variable. When input voltage is within normal
range, the built-in processor adjusts fan speed according to the rectifier module’s internal
temperature and output power. For example, a higher temperature or output power
increases the fan speed. This feature can be disabled via the controller, allowing the fan to
run at full speed regardless of temperature.
• Paralleling: Up to 60 rectifiers can be connected in parallel in one system.
• Communication Failure: The rectifier’s protection indicator (yellow) will flash should it
experience a communication failure. The failure information will be reported to the
Controller and the Controller will process the failure accordingly. During a communication
failure, in order to protect the battery, the rectifier output voltage will automatically be
adjusted as follows. When used with the SCU+ Controller, rectifier output voltage goes to a
default value (53.5 V, which can be modified using the SCU+ Controller). When used with
the ACU+ Controller, rectifier output voltage goes to the ACU+ float voltage setting (this
setting is stored in the rectifier). The rectifier will revert to normal operation once normal
communication is restored.
• Rectifier Output Current Imbalance: When load sharing severe imbalance (output fuse
open) and the output current drops to zero in average current >20% system, then the red
fault indicator will illuminate.
• Monitoring Function: The rectifier has a built-in advanced DSP that monitors and controls
the operation of the rectifier. The DSP also communicates with the Controller in real time
through the CAN bus. Table 5 lists the different commands and information exchanged
between the rectifier and the Controller.
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