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4) Turn on the input breakers and internal output breakers of all UPSs in the parallel systems, and turn on
each UPS in turns. Make sure that AC mode LED or Battery mode LED displays in each UPS. Measure the
output voltage of each UPS to check if the voltage difference is less than 2V (typical 1V) with multimeter. If
the difference is more than 2V, please check that parallel cable or share current cable are connected well.
If they are all connected well, maybe it’s UPS internal issue. Please contact your local distributor or service
center for help.
5) Turn off each UPS in turns and after all of them transfer to Bypass mode, turn on the external output
breaker of each unit.
6) Turn on the UPSs in the AC mode and then the parallel system connection is complete.
2. Add one new unit into the parallel system
1) You can not add one new unit into the parallel system when whole system is running. You must cut off the
load and shutdown the system.
2) Make sure all of the UPS are the parallel models, and follow the wiring refer to section 2-3.
3) Install the new parallel system refers 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 last for more than 0.5s. Then, the UPS will enter into
bypass 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 cable
and share current cable. Then, remove the unit from the parallel system.
Second method:
1) If the bypass is abnormal, you can not remove the UPS without interruption. You must cut off the load and
shut down the system.
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 the input breakers and battery breakers.
3) Remove the UPS that you want.
4) Turn on the input breaker of the remaining UPSs and the system will transfer to Bypass mode.
5) Set the maintenance switches from “BPS” to “UPS and put the maintenance bypass covers back. Turn on
the remaining UPSs and finish the parallel system connection.
Warning:
(Only for the parallel system)
●
Before turning on the parallel system to activate Inversor, make sure that all unit’s maintenance switch at
the same position.
●
When parallel system is turned on to work through Inversor, please do not operate the maintenance switch
of any unit.
