2.2 Replace the CNTL board and COMMUNICATION board
Please ignore this step, if the the units you have bought were suitable for parallel function already.
For Gallon 3-3 UPS
（
10K
，
15K
，
20K
，
30K
）
，
there are 2 control boards, one for PFC control , and the other
for INV control, the following picture showing the different between these two boards, the part number (The
beginning 10 number of the series number) and firmware label (Label on the MCU) in the picture just for
reference, different version UPS may have different control board, the part number and firmware label may
different with the picture showing:
Make sure the UPSs that you want to parallel have the same part number, if different please sent the par number
to us for verifying.
In case you need to replace the control board, please following steps below:
