Understanding UPS Operation
An ABM charging cycle starts with the charger driving the battery voltage, at maximum current limit, to a battery charge level of 2.34 volts/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 100 hours, an alarm sounds.
As soon as a battery charge level of 2.34 volts/cell is reached, the battery is charged at a float level of 2.31 volts/cell for 48 hours (battery float time) plus 150% of battery charge time.
At initial startup, the battery run time on the front panel display indicates two minutes. After the
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 2.1 volts/cell during the first 240 hours 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.
Accumulated discharge time is over a maximum battery discharge time of 20 seconds.
Battery voltage is under the opportunity charge level of 2.1 volts/cell and the unit has been in rest mode for longer than 240 hours.
An XCP command Initiate Battery Test is received.
7.4.4Bypass
The bypass has a
7.4.5 Batteries
The UPS operates from battery strings from 192 cells (384V nominal) to 240 cells (480V nominal).
