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SC300 Handbook
48
Copyright © 2007-2018 Eaton Corporation. All Rights Reserved.
IPN 997-00012-03 B2 Issue B2 July 2018
Typical LVD Arrangements
The simplest use of an LVD is a single battery disconnect contactor.
The following diagram shows a typical arrangement of two LVDs. This arrangement allows lower
priority loads to be disconnected first (contactor controlled by control channel LVD 1), either at a
specified battery voltage or a specified time interval after an ac supply failure. This then prolongs
battery power for the highest priority loads (contactor controlled by control channel LVD 2). The
battery 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 (only
disconnects after LVD 1)
Connections to high priority
loads (for example
transmission equipment).
Connections to low priority
loads.
Connection to the SC300
system controller via the I/O
board.
More complex arrangements with up to 16 contactors and a selection of disconnection criteria are
possible with the SC300 system controller. The exact arrangement(s) used in a particular Eaton dc
power system will be described in the Installation and Operation Guide.