480v Single Phase forklift battery charger wiring?
Set all the charger tap changers to 480 V.
Create a supply from two phases with a suitable 2-pole miniature circuit breaker. Note that the charger is only fused on the live so the external fusing is essential.
Power the charger as shown in Table 1.


Table 1. Wiring connections.

Supply  Charger
------  -------
   L1      L
   L2      N
   L3      n/c
   N       n/c
   PE      PE