Specifications

9
www.eaton.com/powerquality 1300 UPS UPS
ABM® Technology
Battery service life is a major contributor to UPS reliability. Since
batteries are electro-chemical devices, their performance gradually
decreases over time. Premature wear-out means higher costs in terms
of replacement labour and shorter service cycle. A worn battery entails
a risk of unexpected load loss. In normal UPS operation, back-up power
is needed only occasionally and the battery ‘wearing’ rate depends
strongly on how the full charge is being maintained. Excess charging is
detrimental under any operating circumstances.
Eaton has created ABM
®
Technology to extend the life of valve
regulated lead-acid batteries by applying sophisticated logic to the
charging regime. Using traditional trickle charge method, batteries
become subject to electrode corrosion and electrolyte dry-out,
especially in standby service use due to continuous float charging.
ABM
®
is essentially an addition of intelligence to the charging routine
by preventing charging when it is not necessary, thus significantly
retarding wear-out. ABM
®
provides an additional feature for monitoring
battery condition and advance warning about the end of battery life upon
detection of a weak battery. Also, it optimises the recharge time, which
is advantageous when there may be consecutive power outages within
a short period. ABM
®
has been used for over fifteen years in our UPSs
ranging from 1 to 160 kVA and is now applied in UPS' up to 1100 kVA.
ABM
®
cycle and operation – how does it work?
The basic idea about ABM
®
is to leave a fully charged battery in rest
mode for most of the time, and then apply charge current only at certain
intervals. Initially, in order to charge up a fully or partly discharged
battery, the charger starts at a constant current appropriate for the
battery type used. When the battery voltage reaches a set level
the operation is changed to float mode using a constant but lower
voltage, thus providing an optimum recharge time. The battery is kept
at this voltage for 24 hours until it comes to the first test point. This
takes approximately one minute and during this period voltage drop
measurements are taken while loading the battery, giving an indication
of battery condition. The float charging is continued for an additional
24 hours, plus a period equal to 1.5 times the constant current charging
time, before the rest mode is initiated. At this point, the charging is
discontinued for a maximum of 28 days – as if the batteries were
• Predictive and automatic diagnostics of Battery Health
• Significant extension of battery life compared
to traditional charging method
• Optimisation of battery recharging time
with dual mode charging method
• Automatic battery charge voltage compensation within
0 to +50ºC temperature range
User benefits
disconnected. During the first 10 days the battery voltage is continuously
monitored, and if it drops below 2.1 V/cell, the ABM
®
re-starts in charge
mode and the user gets a notification of improper battery operation. If
it drops below this limit after the 10 day period, charging is resumed
without alarm. In short, the algorithm uses three charging stages in its
operation. Thus, the batteries experience much less stress than in the
case of traditional charging. A typical battery charging cycle without
power interruptions is shown in the graph below.
Battery voltage during ABM
®
charging process.
ABM
®
technology significantly increases battery service life