APC Battery Management System manual Alarms, Fault Alarm Criteria, Fault Criteria

Battery Management System

USER’S GUIDE

®

Alarms

Fault Alarm Criteria

Fault	LED	Fault Criteria
Charger Voltage Low	Charger	Less than 2.1 volts per cell for lead-acid
		batteries, or as set by user.
Charger Voltage High	Charger	Greater than 2.4 volts per cell for lead-acid
		batteries or as set by user.
Shorted Cell	Batteries	Less than ((#Cells/Batt)-1) x (Vstring)
		(#Cells/Batt) x (#Batt/String)
Blown Fuse/Open	Management	Less than ½ volt on first or last battery in a
Connections or Wiring	Controller	string or two consecutive batteries within a
		string.
Low Capacity	Batteries	Any individual battery with more than 20%
		lower voltage than the highest battery in
		the same string during a discharge.
Thermal Runaway	Batteries	Greater than 20% more response current
		than the benchmark, or greater than 95º F
		battery temperature, or as set by the user.
Dryout/Sulfation/Opens	Batteries	Greater than 20% less response current
		than benchmark, or as set by user.
High or Low Operating	Environment	Less than 50° F or greater than 95° F or as
Temperature		set by the user.
High Ripple Current	Charger	Greater than 5 amps RMS per ampere-
		hour or as set by the user.

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