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Note:
If the UPS is abnormal in the above regulation, please perform maintenance
according to the steps of removing single UPS.
Operating process of removing the Paralleled UPS:
1. If you need to remove the UPS on normal running, press the Power-off button of the
UPS that is confirmed to be removed twice continuously and the UPS will cut off its
output immediately;
2. Disconnect the input breaker, the external input breaker, the output breaker and the
battery breaker of the UPS that need to be removed.
3. Turn off the UPSs that are running, after all of them transfer to the Bypass mode,
disassemble the cover board of each UPS and set the maintenance switch from
“UPS” to “BPS” and then disconnect the input breaker of each UPS.
4. If the remained UPS system becomes single UPS system after removing the single
UPS, you need to connect the short connection wire of the JP1 and JP2 located on
the Terminal block of the UPS.
5. After all panels of the UPSs do not display anything any more, disassemble the cover
board of the parallel port on the UPS connected with the parallel cable of the UPS
that need to be removed. Remove the parallel cable and screw the cover board of
the parallel port back again.
6. Disassemble the cover board of the parallel port located on the UPS that need to be
removed and remove the parallel cable, and then screw the cover board back again.
7. Close all of the input mains breakers of the remained UPSs. After all UPSs transfer
to the Bypass mode, set the UPS maintenance switch from “BPS” to “UPS” and
screw the maintenance cover board back again. Then turn on all of the UPSs and
transfer them to the INV mode to perform the parallel operation.
8. If the removed UPS will be used in single mode, JP1 and JP2 on the terminal block
should be connected with a short connection wire.
Notes for parallel maintenance:
1. Make sure that the maintenance switches of all UPSs (including new unit) are in the
same positions (either in the positions of “UPS” or “BPS”) when the UPS parallel
system is going to be in INV mode.
2. Make sure that the output breaker of the UPS that is removed is in the position of
“OFF” before the UPS parallel system transfers to the INV mode.
3. Don’t operate the maintenance switch of any one UPS in the parallel system when
he UPS parallel system is in the INV mode.
4. The UPS in the parallel system will cut off its output if its Power-Off button is pressed
twice continuously. Please operate carefully and let the user know the operation at
the same time.
