Operator’s Guide for Rugged-UPS
TM
1252 Series
91-0120 Rev. B 28
© Acumentrics Corporation 2007-2008
Section 3
Maintenance and Trouble Shooting
Maintenance and Battery Storage
The proper storage of batteries cannot be overemphasized. Improper battery storage is the most common
form of battery misuse. All batteries exhibit a loss of charge over time even when stored in an open circuit
condition. This is called self-discharge. Both chemical and electrochemical reactions within the battery
cause this consumption of the stored energy. The rate of reaction, and therefore self-discharge, increases
as a function of temperature. If the batteries are stored long enough without a periodic replenishment of
charge, an irreversible loss of battery capacity can occur, causing premature battery failure.
All Acumentrics battery packs are shipped fully charged. They should be stored separately from the UPS
and used on a FIFO (First In, First Out) basis. All battery packs should be recharged before use if 100%
capacity is required. The stored battery packs should be kept on a maintenance program and should be
recharged periodically according to the recommendations shown in table 1. Battery packs can be
recharged using the UPS.
Table 1 Storage Temperature and Supplementary Recharge Intervals
Storage Temperature
Recharge Interval
Below 20
°
C (68
°
F)
Every six months
Between 20
°
C and 30
°
C (68
°
F and 86
°
F)
Every three months
Over 30
°
C (86
°
F)
Storage to be avoided
The battery OCV (Open Circuit Voltage) can be used as an indicator of battery pack residual capacity.
When measuring the OCV, the battery pack should not have been charged or discharged within the past
24 hours. A supplemental recharge should be performed if the battery pack OCV is 24.6 volts or less
when measured at 25
°
C (77
°
F).
Not all installations will require internal batteries if you have the capability to utilize the external DC
connections to the unit or if you plan to use the unit as a line conditioner.
The ACG18BP has a 4 hour recharge time to 90% present capacity from full discharge.
Charge Battery
The UPS charges its battery when connected to utility power. For best results, charge the battery 4 hours
before use. It is acceptable to use the UPS without first charging the battery, but battery run time maybe
shorter until the battery fully charges.
The UPS’s shipping materials are designed to provide the necessary protection during shipping. These
materials must be used if you ever have to return the UPS for service. Damage sustained during transit is
not covered under warranty.
The UPS is continually creating the AC output from a high voltage DC bus, thus protecting your
equipment from surges, spikes, brownouts, blackouts and noise.
