Emerson NetSure 721NPBB User Instructions page 14

NetSure ™ -48V DC Power System
User Instructions, UM582127000 (Issue AD, January 20, 2014)
Optional LVD Driver Lite Circuit Card
The optional LVD driver lite circuit card installed in the main bay contains an LVD inhibit switch and indicator. Refer to
driver lite circuit cards are 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.
Caution
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
Warning
be left in the OFF (inhibit) position.
Figure 4. Optional LVD Driver Lite Circuit Card
J2
LVD Inhibit
Active Indicator
Illuminates when the
low voltage disconnect
circuit has been disabled
through the use of the
LVD Inhibit switch.
Spec. No: 582127000
Model No: 721
NPBB
J3 J1
S1
LVD Inhibit Switch
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).
Switch and indicator located
on circuit card installed in
Main Bay only.
Note: The UP position will not close the LVBD contactor
if the battery is manually disconnected using the
Manual Battery Disconnect Switch.
[6]
Figure 4. LVD
Code: UM582127000
Issue AD, January 20, 2014