Emerson 710NPBA Optional LVD Driver Lite Circuit Card

User Instructions UM581127000

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

Chapter 2. Operating Procedures Page 7

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Optional LVD Driver Lite Circuit Card

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

Refer to Figure 2-4. This card is required for distribution cabinets that contain two LVLD

contactors or one LVLD contactor and one LVBD contactor. LVBD contactor must be

rated at 600A or lower.

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 2-4

Optional LVD Driver Lite Circuit Card (P/N 547873)

LVDInhibit Switch

LVDInhibit

ActiveIndicator

MomentaryUP / Middle / Down

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

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

DOWNPosition: ON (ACU+ controls LVD’s).

Illuminateswhen the

lowvoltage disc onnect

circuit has been disabled

throught heuse of the

LVDInhibit switch.

J1J3

Note:The UP position will not close the LVBD contactor

ifthe battery is manually disconnected using the

ManualBattery Disconnect Switch.