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Annex. B Instructions of the parallel system for UPS
The UPS can be paralleled; the general is 2 UPSs in parallel or 3 UPSs in parallel. If more than 3 UPSs in
parallel, please inform the factory in advance.
1. Power cable connection 3 UPSs in parallel.
The cable connection drawing for 3 UPSs in parallel (dual input)
Note: MS1, MS2 and MS3 are the main input switches for each UPS, BS1, BS2 and BS3 are the bypass
input switches, OS1, OS2 and OS3 are the output switches, OS is the output main switch of the power
system, MBS is the maintenance bypass switch.
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