NetSure
™
-48V DC Power System
User Instructions, UM582127000 (Issue AD, January 20, 2014)
Spec. No: 582127000 Code: UM582127000
Model No: 721NPBB 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 Figure 4. LVD
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.
If the switch is returned to the ON (normal) position when low voltage disconnect alarms are active, a low voltage
disconnection will occur.
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 4. Optional LVD Driver Lite Circuit Card
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.
Switch and indicator located
on circuit card installed in
Main Bay only.
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