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Three-Phase UPS (10kVA-160kVA) Series
User Manual 5 Operation Guide
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5.4 Parallel System Operation
5.4.1 Start Parallel System
Don't turn on load until parallel system powers on completely. Ensure all load switches of load of
parallel system are switched off and the wiring for the input and output power is correct.
Step 1 Switch on UPS1 bypass switch, the power board starts working and touch screen begins initializing.
About 10s later, the initialization is finished and touch screen and LED show normally.
Step 2 Switch on UPS mains switch.
If the mains input is normal, rectifier will activate automatically and the rectifier indicator will be on.
About 15s later, the DC BUS voltage will be established completely.
Step 3 Start UPS1 inverter system.
When startup, press ON combination button. About 30s later, the green indicator is off.
Switch on output switch, the indicator is on and UPS1 works normally.
Step 4 Check whether the output voltage and frequency of UPS1 are normal by multimeter.

Normal=>Step 5

Abnormal=>Step 12
Step 5 Start UPS2 following the Step 1 to Step 3.
Step 6 Start UPS2 inverter system.
When startup, press ON combination button. About 30s later, the green indicator is off and
UPS2 works normally.
Step 7 Check whether the output voltage of UPS2 is normal by multimeter.

Normal=>Step 8

Abnormal=>Step 12
Step 8 Check whether the voltage difference of output three-phase of UPS1 and UPS2 is normal by
multimeter.