2 Overview
14
Figure2-11
Battery inverter mode (the thick solid line stands for the energy flow direction)
Before the battery stop discharging, if the mains recover normal, the rectifier will transfer to
mains input automatically and charge the battery at the same time. That is to say, the UPS
recover normal mains power supply mode. If the mains always abnormal and the battery is
running up, the UPS will send sound and light alarm and stop working till battery low-voltage
point. At that time, the buzzer long beeps to alarm, the power for load powers down. Under
the circumstance of mains power outage completely, the UPS will shut down about 1min
later automatically and close the power of the UPS to avoid the battery discharge slimly, thus
to protect the service life of battery. Once the mains recovers, the UPS will start automatically
and turn to normal mains power supply mode.
Bypass power supply mode
Under the circumstance of bypass voltage normal, when UPS off or fault (such as inverter
output overload, over-current surge or IGBT over-temperature etc) while UPS on, the UPS
will output by bypass. When UPS on and the fault removed, it will turn to inverter output
again. If the same fault occurs more than 5 times in a short time, the UPS protects and
output by bypass until power off manually or power down and remove the fault, restart the
UPS and then it will recover normal work.
Summary of Contents for IST9
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Page 2: ...UPS IST9 10 20 kVA User Manual...
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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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