2
Once the AC power returns, the system’s microcontroller employs optimum charging techniques to
extend battery life while minimizing charging time. The microcontroller follows a unique algorithm by
which it regulates the charging process and enables a minimal recharging time.
WARNING
Your UPS may contains up to twenty (depending on model) 12 volt batteries wired in series providing
a total nominal DC voltage of up to 240 volts. This voltage, if present, is used to power the UPS when
the AC utility is not available. Because of the presence of this high voltage energy source, even when
the UPS is not directly connected to the utility, certain precautions must be taken to avoid possible
injury should you need to unlock and enter this unit. Before attempting to unlock or enter the unit,
read the section of this manual on
“Maintenance”
for important safety precautions. Otherwise,
maintenance personnel may be exposed to an electrical shock hazard that could result in death or
injury, or damage to the UPS or its electrical loads.
WARNING
Always keep all panels and the front door locked. Always store the keys that unlock the unit in a safe
place. DO NOT keep the keys in the lock of the unit where someone unqualified or unsupervised may
inadvertently open the main unit or any ancillary units. Leaving the unit unlocked, or leaving keys in
the lock, may expose personnel to an electrical shock hazard that could result in death or injury, or
damage to the UPS or its electrical loads.
