9 Common Power Problems  
  Selecting a UPS  
  ABM Technology  
  Harmonic Distortion  




Series 3 UPS
Series 3 UPSs offer a low-price solution to environments requiring minimal power protection. Utility power is provided during normal operation. Harmonic distortion present in the utility line passes through to the load.



Series 5 UPS
Series 5 UPSs provide basic power protection at mid range prices. Line-interactive UPSs provide more voltage regulation than off-line. Harmonic distortion, however, passes through unaffected.



Series 9 UPS
Series 9 UPSs are ideally suited to protect critical equipment. Online UPSs protect against all types of power problems and continuously use the inverter to create clean, new, regulated power. Harmonic distortion, no matter how high, cannot pass through to the load. Powerware Series 9 UPSs isolate equipment from harmonic distortion and are strongly recommended for critical applications that must meet the 5% maximum harmonic requirement stated in major computer manufacturer specifications and installation guides.