OnLine Power Telecommunication - Manual (Page 52)

OnLine Power
C-1
REV A
Appendix C: BATTERY MAINTENANCE TESTING &
SPECIFICATIONS
Battery Specifications
• Battery Impedance - The battery impedance value is measured @ 25 o
C. This value is for new
batteries at full state of charge, on open circuit at a frequency of 30 Hz. Battery Type PRC - 12120X
Impedance is 5.05 milliohms.
• Float Voltage - The specified float voltage ” window ” is 2.27 - 2.30 V.P.C. @ 25 o
C. This Value will
help in reducing recharge times and keeping the batteries at the highest state of charge.
Recommended Procedures
These methods are designed to be used on a battery system installed for a minimum period of 6 month, in a steady
state of Float condition and not under conditions of high current recharge or discharge.
• Measure Float Voltage
• When the Low Battery LED is ” ON ” over 24 hours test system, remove the Battery Tray Plug from
the battery jack on the Electronic Tray, so readings can be taken.
• Measure and record system voltage directly across the battery plug.
• If the battery system is determined to be low voltage system after 24 hours of charging the system
voltage will be only 3% low, remove and replace the Battery Tray.
• Battery Servicing
• Measure and record a 10% sample of individual battery temperatures at the negative terminal post.
• Identify batteries that are greater than 3 o
C above ambient from the calculated average. If no
external causes for higher battery temperatures are noted.
• Check that the filters are clean and Fans are operational.
• If no change is noted, remove and replace the Battery Tray.
• Visual Inspections
• Examine batteries for any abnormalities in end wall bulge, post leakage, cover to cells leakage, etc.
• Identify any end wall bulges that exceed 1/2 inches compared to the other batteries in tray.