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)
LVD Inhibit Switch
LVD Inhibit
Active Indicator
Momentary UP / Middle / Down
Momentary UP Position: Closes all LVD Contactors (inhibit mode).
Middle Position: OFF (ACU+ DOES NOT control LVD’s) (inhibit mode).
DOWN Position: ON (ACU+ controls LVD’s).
Illuminates when the
low voltage disconnect
circuit has been disabled
through the use of the
LVD Inhibit switch.
J1J3
J2
S1
Note: The UP position will not close the LVBD contactor
if the battery is manually disconnected using the
Manual Battery Disconnect Switch.
