describe the sequence of a UPS system operation:
1. 600V AC, is supplied to the rectifier/chargeer section from the MCC
2. this 120V AC 1-phasepower passes through the bypass switch to supply the various AC power user
3. the rectifier/charger converts the 600V AC to 125V DC. this 125V DC is used to supply power to critical control circuitry and also maintain the battery banks, in a fully charged condition.
4. this 125V DC power output from the rectifier/charger also goes to the inverter where it is converted back to AC.
