Parallel Operation - INFOSEC 5000 User Manual

3-5. Parallel Operation

1. Parallel system connection
1) Make sure all of the UPS are parallel models, and refer to section 2-3 for wiring details.
2) Turn off the input and output breakers of each UPS, and turn off the battery breaker if the UPS is a
long-run model.
3) Remove the cover of the parallel share current cable port on the UPS, connect each UPS one by
one with the parallel cable and share current cable, and then put the cover back on.
4) Turn on the input breaker of the each UPS and measure the voltage difference between the output
line1 of each UPS using a multimeter. If the voltage difference is less than 1V, it means all
connections are correct. If the difference is larger than 1V, check that the wiring is connected
correctly.
5) Turn on the input breakers of all UPS in the parallel systems and turn on each UPS in turn. Make
sure that the AC mode LED or Battery mode LED displays work on each UPS. Measure the output
voltage of each UPS to check that the voltage difference is less than 2V (typical 1V) using a
multimeter. If the difference is more than 2V, please check that the parallel cable or share current
cable are connected properly. If they are properly connected, there may be a UPS internal issue.
Please contact your local distributor or service center for help.
6) Turn off each UPS in turn. Once this is done switch to Bypass mode and turn on the output
breaker of each unit.
7) Turn on the UPS in AC mode and then the parallel system connection is complete.
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 2-3.
3) To install the new parallel system, refer to the previous section.
3. Remove one unit from the parallel system
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 the
UPS 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 chosen UPS.
4) Turn on the input breaker of the remaining UPS and the system will transfer to Bypass mode.
5) Set the maintenance switches from "BPS" to "UPS and put the maintenance bypass covers back
on. Turn on the remaining UPS and finish the parallel system connection.
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.
INFOSEC UPS SYSTEM – 4 rue de la Rigotière – 44700 Orvault – France – www.infosec-ups.com
Hot Line Tel : +33 (0)2 40 76 15 82 – fax : +33(0)2 40 94 29 51 – hotline@infosec.fr – 07 11 AA 59 203 09
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