Lucent Technologies -48V CPS4000/CPS4000 PLUS Cabinet Power System
Issue 13 December 2000 Alarms, Controls, and Displays 7 - 21
LVD/Thermal Management
Introduction The display on the Output Wiring module has four LEDs: LVD Open,
LVD Fail, Temp Comp, and Probe Fail. An explanation of the
circumstances that cause the LEDs to light are given in the following
paragraphs:
LVD Open The Low-Voltage Battery Disconnect contactor is open.
LVD Fail This pack has redundant circuitry for monitoring plant voltage. This
LED lights when the monitoring circuits disagree with each other,
indicating the LVD pack is defective and should be replaced.
Probe Fail Alarm If a thermal probe becomes defective, either open or short, the thermal
management control issues the Probe Fail Alarm and a yellow LED on
the LVD/Thermal Management circuit pack lights. This alarm is not
service affecting.
Note: Monitor batteries at a minimum of two points (two thermal
probes) to ensure battery protection to prevent potential thermal
overload.
Temperature
Compensation
If the temperature of the batteries exceeds 25°C (77°), the thermal
management control transmits a signal to the control unit, which then
lowers the float voltage on the batteries proportionally to the rise in
temperature above 25°C (77°) and lights a [yellow/BSP2 or green/
BSP2C] LED on the LVD/Thermal Management circuit pack.
Use DIP Switch SW 2.2 on the ES648 MCUs to choose the appropriate
algorithm for this feature:
• Open is EURO Mode
• Closed is NAFTA Mode
These algorithms are illustrated in Figures 7-2 and 7-3.
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