The Dependable Power Systems Uninterruptible Power System is a solid-state double conversion unit that provides continuous, clean, regulated sine wave power to sensitive electronic equipment.
The Uninterruptible Power System (UPS) has five major components:
During normal operation, the rectifier/charger converts the AC power from the utility to DC power to operate the inverter and charge the batteries. The inverter changes the DC power back to clean, regulated, sine wave power which is supplied through the static switch and the manual bypass switch to the critical load.
Should there be a loss of utility power, the inverter draws the DC power from the batteries without switching to continue providing AC power. In one minute, an alarm will sound to alert operating personnel of a utility failure allowing for an orderly shutdown of the critical load. A second alarm will sound when the batteries are near exhaustion, warning that shutdown is imminent. After the batteries are discharged, the UPS shuts itself off.
After the utility power has returned, the UPS automatically restarts, picks up the load, and starts recharging the batteries.
The static switch is a make-before-break electronic switch that transfers the critical load to the bypass or alternate power source without interruption should the UPS experience a failure or if an overload should occur. If the transfer is due to an overload, the static switch automatically retransfers the critical load back to the inverter after the overload condition ends.
The manual (maintenance) bypass switch, hereon called MBS, is a manually operated make-before-break switch. When maintenance is to be performed on the UPS while still supplying power to the critical load, the MBS is placed in the "LOAD ON BYPASS" position. This transfers the load to the bypass AC power source without interruption, allowing all power to be shut down in the UPS.