Neel on-line ups system is supplied by neel reo systems. This is true on line double conversion micro-controller based ups system which has somegeneral features such as: this system is used for high end servers, workstations, cad/cam, risc, unix and other system which are sensitive to ac power irregularities and blackout.; the high switching frequency of the ups enables for response to dynamic loads like cnc,textile, & printing, glass processing, medical equipments, resulting in very good transient response for non-linear loads.; the ups is designed to support sophisticated equipments with crest factor demand and provides unmatched performance. Various salient features of this ups system include: true on-line double conversion; compact and silent in operation; advanced pwm,igbt technology; suitable for cnc m/cs and industrial applications; built-in static by-pass switch; programmable battery low alarm; rs 232 interface available for m/c interlock; user friendly operations. Electrical specifications include: ip voltage-230 vac, 3 phase 4 wire, dc link -ripple factor- less than 2%, enviornment- 0 to 45 deg max, ip frequency- 47 to 53 hz, efficiency:inverter efficiency-better than 93%, overall efficiency-better than 90%.