PowerWalker Battery pack for VFI 10000P_RT LCD - Manual (Page 23)

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3.7 Installation of UPS with AC inputs
CAUTION: Online 6K/10K series support that the UPS can have
separate AC inputs. So before connecting wires of seperate AC
inputs, you should confirm that their earthing systems are identical.
Otherwise, a transformer is necessary.
UPS with common Normal and Bypass AC inputs
UPS with separate Normal and Bypass AC inputs
Earthing systems are identical:
Earthing systems are separate:
Three different installations can be choosen:
1) Transformer in the Normal AC input.