2 Overview
13
and output pure sine-wave AC power, the output turns to inverter output to load from bypass
output (if equipped).
When mains abnormal, the battery voltage boosts by rectification/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.
2.2.2 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. The maintenance bypass power supply mode can only suitable for
install the UPS series fitting with distribution module.
Normal mains power supply mode
When mains power normal, the UPS works in mains inverter status and charge the battery at
the same time. The work mode is as shown in Figure2-10.
Figure2-10
Normal mains power supply mode (the thick solid line stands for the energy flow
direction)
Battery inverter mode
When mains abnormal, the rectifier will transfer to battery input immediately, boost the
battery voltage and then maintain the voltage of DC bus voltage to guarantee the inverter
output continuous. As shown in Figure2-11.
Summary of Contents for IST9
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Page 52: ...3 Installation 43 Figure3 29 Diagram of 33 mode parallel system wiring of 10kVA 20kVA UPS...
Page 54: ...3 Installation 45 Figure3 31 Diagram of 33 mode parallel system wiring of 30kVA 40kVA UPS...
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