Opening/Closing The Enclosure Doors; Causes Of Battery Ground Faults - Delta 100kW PCS Installation Manual

Causes of Battery Ground Faults

There are several causes for introducing a ground fault into a battery system. The following presents
the most common causes for ground faults.
Debris on the surface of the container- Dirt and debris on the surface of the battery can develop

paths for tracking to the battery rack.
Maintenance activities can place residual electrolyte on the container, which can enhance the

conduction path created by the debris exacerbating the level of ground fault.
Penetration in the container- issues such as cracks by stress or holes by penetration in the

container create an opportunity for electrolyte to seep out of the container and contact the
battery.
To prevent possible ground fault risks, equip the corresponding GFD equipment. The battery warranty
may be null and void if the GFD equipment is not equipped.

Opening/Closing the Enclosure Doors

Disconnect Position: The AC and DC disconnects on the front door have an interlock
mechanism to prevent the front door from being opened if it is not in their OFF position. Turn
the disconnects to OFF position before opening/closing the doors. Turning the disconnects
clockwise sets them to ON (vertical) position, while turning the disconnects counter
clockwise sets them to OFF (horizontal) position.
Installation Manual 37
Wiring Instructions