Lucent Technologies -48V CPS4000/CPS4000 PLUS Cabinet Power System
Issue 13 December 2000 Product Description 2 - 13
Power Modules, continued
Features,
continued
• Output current limit: Power modules provide a constant output
voltage up to their rated output current, at which point they begin to
provide constant current outputs. The maximum output current is
inherently limited to less than 110% of the rated output without user
adjustment.
• Internal selective high-voltage shutdown: If the plant voltage
goes too high, only the defective power module will shut down.
• Backup high-voltage shutdown: If the internal high-voltage
shutdown fails, a backup is provided that is faster and is set to 60
volts.
• Restart circuit: If a rectifier or converter has shut down due to
high plant output voltage, it will attempt to restart a maximum of
two times automatically. After two unsuccessful attempts, the
power module shuts down and locks down. This assumes that a
battery is present to maintain the circuitry on the MCU or ACU.
• Ringer redundancy: If a ringer fails, that ringer will be
automatically removed from service and a hot on-line redundant
ringer will be switched into service.
• Power module alarm: The power module alarm provides both a
local visual indication of low output voltage and a signal to the
plant MCU or ACU. In addition, alarms are generated by a high
module temperature and/or an operated internal fuse.
• Thermal alarm: The -48V CPS rectifiers and converters are fan
cooled to increase their reliability. Excess internal temperature
caused by fan failure or other conditions initiates a thermal alarm.
• Power factor: State-of-the-art circuits in the rectifiers increase the
power factor to near unity.
• Total harmonic distortion: By controlling the power factor, the
total harmonic distortion is reduced to less than 5% at full load, less
than 15% at half load.
• Voltage range selection: CPS power modules automatically accept
a wide range of ac input voltages.
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