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5) Turn on the parallel system in AC mode:
a)
Turn on the line input breaker of each UPS(for dual input, also turn on bypass input breaker). After all
UPSs enter to bypass mode, measure the output voltage between two UPS for the same phase to make
sure the phase sequence is correct . If these two voltage differences are near to zero, that means all
connections are correct. Otherwise, please check if the wirings are connected correctly.
b)
Turn on the output breaker of each UPS.
c)
Turn on each UPS in turns. After a while, the UPSs will enter to AC mode synchronously and then, the
parallel system is completed.
6) Turn on the parallel system in Battery mode:
a)
Turn on the battery breaker (only available in long-run model) and output breaker of each UPS.
NOTE:
It’s not allowed to share one battery pack for long-run UPSs in parallel system. Each UPS should
be connected to its battery pack.
b)
Turn on any UPS. A few seconds later, the UPS will enter to battery mode.
c)
Then, turn on another UPS. A few seconds later, the UPS will enter to battery mode and add to the
parallel system.
d)
If you have the third UPS, follow the same procedure of c). Then, the parallel system is complete.
If more detailed information is needed, please contact supplier or service center for parallel operation
instruction.
2. Add a new unit to the parallel system
1)
You cannot add a new unit into the parallel system when the whole system is running. You must cut off the load
and shutdown the system.
2)
Make sure all of the UPS are parallel models, and follow the wiring procedure in section 2-4.
3)
To install the new parallel system, refer to the previous section.
3. Remove one unit from the parallel system
There are two methods to remove one unit from the parallel system:
First method:
1)
Press the “OFF” key twice and each time should be lasted for more than 0.5s. Then, the UPS will enter into
bypass mode or no output mode without output.
2)
Turn off the output breaker of this unit, and then turn off the input breaker of this unit.
3)
After it shuts down, you can turn off the battery breaker (for long-run model) and remove the parallel and share
current cables. And then remove the unit from the parallel system.
Second method:
1)
If the bypass is abnormal, you cannot remove the UPS without interruption. You must cut off the load and shut
down the system first.
2)
Make sure the bypass setting is enabled in each UPS and then turn off the running system. All UPSs will transfer
to Bypass mode. Remove all the maintenance bypass covers and set the maintenance switches from “UPS” to
“BPS”. Turn off all the input breakers and battery breakers in parallel system.
3)
Turn off the output breaker and remove the parallel cable and share current cable of the UPS which you want to
remove. Then, remove it from parallel system.
4)
Turn on the input breaker of the remaining UPS and the system will transfer to Bypass mode. Set the
maintenance switches from “BPS” to “UPS and put the maintenance bypass covers back.
5)
Turn on the remaining UPS according to the previous section.
Warning: (Only for the parallel system)
●
Before turning on the parallel system to activate the inverter, make sure that the maintenance switch
on all the units is in the same position.
●
When the parallel system is turned on to work through the inverter, please do not operate the
maintenance switch on any unit.
