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Introduction
1.1.8
Advanced Battery Management
Advanced Battery Management (ABM) technology uses sophisticated sensing circuitry and a three-stage
charger. The charger is a high-frequency, IGBT-based power conversion stage that extends the useful service
life of UPS batteries by isolating the battery from the electrical environment, except for periodic charging or
reserve mode operation. ABM also protects batteries from damage due to high current charging and inverter
ripple currents. Charging at high currents can overheat and damage batteries.
ABM extends battery life by keeping the batteries charged and performing periodic battery testing. The battery
test checks the batteries by transferring to battery mode. During the test the battery voltage is constantly
monitored to determine Battery Health. ABM is intended for VRLA style batteries.
An ABM charging cycle starts with the charger driving the battery voltage at maximum current limit, to a battery
charge level of 2.30volts/cell. The time it takes for the voltage to reach to the battery charge level is saved as
the battery charge time. If the battery charge time exceeds 24 hours, an alarm sounds.
When the battery reaches the float level, the battery is charged at the float level for 48 hours. Due to charger
capability, some battery cabinet configurations extend float level to 72 hours. Twenty-four hours into the float
period, a series of battery tests are performed to check the battery health. The float level charge continues after
a successful test.
After initial startup, the battery run time on the front panel display indicates two minutes. After the 24-hour float
charging period and automated battery testing, the actual battery run time is determined and the actual battery
run time is displayed.
After the float period is completed, the charger is disconnected and the batteries are allowed to rest for 672
hours (28 days) maximum rest time. If the battery voltage falls below the opportunity charge level of 2.1V/cell
during the first 240 hours (10 days) of the rest period, an alarm sounds.
An ABM charge cycle is initiated whenever one of these four conditions occurs since the last charge cycle:
The batteries have rested over the maximum rest time of 672 hours.
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Accumulated discharge time is over a maximum battery discharge time of 20 seconds.
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Battery voltage is under the opportunity charge level of 2.1 volts/cell and the cabinet has been in rest mode
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for longer than 240 hours.
A SHUT command or manual front display command Initiates Battery Test.
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1.2
Options and Accessories
Contact an Eaton sales representative for information about the following options.
1.2.1
Integrated Battery Cabinet
Battery backup protection with additional runtime can be provide by equipping the UPS system with up to four
Integrated Battery Cabinets (IBCs) containing sealed lead-acid, maintenance-free batteries. The IBCs are
housed in single, free-standing cabinets designed for line-up-and-match installation, but may be installed
separate from the UPS cabinet. An external battery disconnect switch or tie point must be used when three or
four IBCs are located separate from the UPS cabinet. The IBCs may be installed on either the right or left side
of the UPS cabinet. The recommended installation location for adjacent battery cabinets is on the right side of
the UPS cabinet.
1-4
Eaton 93PM UPS (20–50 kW, 480V Four Wire – 50 kW Frame) Installation and Operation Manual P-164000540—Rev 4
www.eaton.com/powerquality
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