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4.4 Parallel System Operation
4.4.1 Start Parallel System
Don't start loads until parallel system have started completely.
Start the parallel system following the procedures as below:
After installing parallel system correctly, start each UPS in the parallel system according to 04.2 Startup
Operation successively.
When each UPS outputs, measure the inverting voltage of each UPS. The voltage difference between
the max. voltage and the min. voltage should be less than 5V. Switch on breakers that connected with
each UPS in the distribution box in 5min and check the circulation current of each UPS that should be
less than 3A.
If the voltage difference is more than 5V, check if the output of each UPS are all 220V. If the voltage
difference is more than 10V, please contact your local distributor or service center for help. Besides, if the
circulation current of each UPS is too large, it will damage inverter. If the circulation current of each UPS
is more than 3A, please contact your local distributor or service center for help.
Switch on major output breaker and output breakers of each branch in the distribution box. Then start
load successively.
4.4.2 Close Parallel System
Generally, it is not recommended that turn on or turn off the parallel system frequently.
Close all loads and press "OFF" button in the panel of each UPS to shut down UPS successively.
Switch off breakers in the rear panel of each UPS. (In the daily operation, it's unnecessary to switch them
off).
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(1-10kVA) UPS IST3
User Manual
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