If the UPS takes a neutral at the input, it's a good bet there's control and sensor electronics tied on the neutral that could get confused when the neutral switches (noise on the neutral).
Connect a single battery cabinet system. Refer to the illustration, “Cabling 3U Cabinets in Parallel,” above, and connect the UPS-to-battery cable to Connectors A on each battery cabinet in the battery string. Connect the communication cable. Connect to the communication port on the UPS and Communication Port 1 on the first battery cabinet.
Connect to the communication port on the UPS and Communication Port 1 on the first battery cabinet. Connect the first string of additional battery cabinet systems. Connect a battery-to-battery cable to Connector B on the first cabinet in the previous string, and to Connector A on first cabinet in the additional string.
Connect the first string of additional battery cabinet systems. Connect a battery cable to Connector B on the first cabinet in the previous string, and to Connector A on the first cabinet in the additional string. Connect the second string in additional battery cabinet systems.
Each battery string is made up of two battery cabinets that are connected to the UPS in parallel. Connect a single battery cabinet system. Refer to the illustration, “Cabling 3U Cabinets in Parallel,” above, and connect the UPS-to-battery cable to Connectors A on each battery cabinet in the battery string. Connect the communication cable.
Remove the side panels that are adjacent to the other battery cabinets. Push the right-most battery cabinet into position. For seismic anchoring, ensure that the rear seismic bracket connects to the rear anchors. Lower the levelling feet until they connect with the floor - use a bubble-leveler to ensure that the cabinet is level.
Before connecting the battery cables, ensure that the battery breaker on the rear of the battery cabinet is open (Of). Connect the ground wire (PE) to the ground screw on the rear of the UPS. Place the battery cable ring lug on the terminal block, add the insulating plate, then insert the screw and tighten to 30 lb.- in. torque.