Emerson 710NPBA Optional LVD Driver Circuit Card

UM581127000 User Instructions

Issue AB, March 22, 2012 Spec. No. 581127000 (Model 710NPBA)

Page 6 Chapter 2. Operating Procedures

This document is property of Emerson Network Power, Energy Systems, North America, Inc. and contains confidential and proprietary information owned by Emerson Network Power, Energy

Systems, North America, Inc. Any copying, use, or disclosure of it without the written permission of Emerson Network Power, Energy Systems, North America, Inc. is strictly prohibited.

Optional LVD Driver Circuit Card

The optional LVD driver circuit card contains an LVD inhibit switch and indicator. Refer to

Figure 2-3. This card is required for 2-, 3-, or 4-row distribution cabinets that contain

three or more LVD contactors (LVBD and/or LVLD); or if the distribution cabinet is

equipped with an LVBD contactor rated 1200A or higher.

Caution: If the switch is returned to the ON (normal) position when low voltage

disconnect alarms are active, a low voltage disconnection will occur.

Warning: While the LVD inhibit switch is in the OFF (inhibit) position, a low

voltage disconnection will not occur if battery or load voltage decreases

below the low voltage disconnect setpoint. For maximum battery

protection, this switch should NOT be left in the OFF (inhibit) position.

Figure 2-3

Optional LVD Driver Circuit Card (P/N 540972)

LVDInhibit Switch

MomentaryUP / Middle / Down

MomentaryUP Position: Closes all LVD Contactors (inhibit mode).

MiddlePosition : OFF (ACU+ DOES NOT control LVD’s) (inhibit mode).

DOWNP osition: ON(ACU+ controls LVD’s).

LVDInhibit

ActiveIndi cator

Illuminates when the

lowvo ltage disconnect

circuit has been disabled

through the use of the

LVDInhibit switch.

J6 J5 J4

J3 J2 J1

Note:The UP position will not close the LVBD contactor

ifthe battery is manually disconnected using the

ManualBattery Disconnect Switch.