UPS IST7 (10KVA-40KVA)
User Manual
2 Overview
17
5.2 Work Principle
5.2.1
Work Principle Diagram
Work principle diagram
The IST7 series UPS includes rectifier/PFC, inverter, charger, bypass static switch etc
function module, the input power includes mains input, bypass input, battery input, the output
mode includes inverter output, bypass output and maintenance bypass output (if equipped).
When mains is normal, the rectifier starts and the charger charges the battery at the same
time. When UPS off, if bypass is normal, the system turns to bypass output; when UPS on,
the mains boosts by rectifier/PFC and output DC bus voltage, and then go through inverter
and output pure sine-wave AC power, the output turns to inverter output to load from bypass
output (if equipped).
When mains is abnormal, the battery voltage boosts by rectifier/PFC and output DC bus
voltage, and then go through inverter and output pure sine-wave AC power to load. When
mains recover normal, the UPS turns to mains mode from battery mode automatically.
5.2.2
Work Mode
There are 5 work modes of the UPS: normal mains power supply mode, battery inverter mode,
bypass power supply mode, ECO power supply mode and maintenance bypass power supply
mode.
Normal mains power supply mode
When mains power is normal, the UPS works in mains inverter status and charge the battery
at the same time.
