Lucent Technologies -48V CPS4000/CPS4000 PLUS Cabinet Power System
7 - 22 Alarms, Controls, and Displays Issue 13 December 2000
LVD/Thermal Management, continued
NAFTA Algorithm • As temperature rises between 25°C (77°F) and 53°C (127°F), plant
voltage is lowered 72mV per degree. At 53°C (127°F) the plant
voltage is two volts less than the uncompensated battery float
voltage.
• For temperatures between 53°C (127°F) and 75°C (167°F), the
plant voltage remains at two volts less than the uncompensated
battery float voltage.
• For temperatures higher than 75°C (167°F), the plant voltage is
reduced to approximately 48 volts to protect against thermal
runaway. The 48-volt plant setting will stay in effect until the
battery temperature drops to 65°C (149°F), where thermal
compensation resumes normal operation.
The ES647 ACU and ES646 MCUs provide the NAFTA Mode thermal
management control feature, which is illustrated in Figure 7-2.
ES648 MCUs provide the factory-set NAFTA Mode thermal
management control that is switch-selectable to EURO Mode (Option),
which is shown in Figure 7-3.
Figure 7-2: -48V Slope Temperature Compensation
NAFTA Mode Algorithm
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