SC300 Handbook48 Copyright © 2007-2018 Eaton Corporation. All Rights Reserved.IPN 997-00012-03 B2 Issue B2 July 2018Typical LVD ArrangementsThe simplest use of an LVD is a single battery disconnect contactor.The following diagram shows a typical arrangement of two LVDs. This arrangement allows lowerpriority loads to be disconnected first (contactor controlled by control channel LVD 1), either at aspecified battery voltage or a specified time interval after an ac supply failure. This then prolongsbattery power for the highest priority loads (contactor controlled by control channel LVD 2). Thebattery will be disconnected when the battery voltage reaches its minimum preset voltage.Contactor controlled by LVD 1- low priority load disconnect(disconnects first).Contactor controlled by LVD 2- battery disconnect (onlydisconnects after LVD 1)Connections to high priorityloads (for exampletransmission equipment).Connections to low priorityloads.Connection to the SC300system controller via the I/Oboard.More complex arrangements with up to 16 contactors and a selection of disconnection criteria arepossible with the SC300 system controller. The exact arrangement(s) used in a particular Eaton dcpower system will be described in the Installation and Operation Guide.
