Emerson NetSure 721NPBB User Instructions page 13

NetSure ™ -48V DC Power System
User Instructions, UM582127000 (Issue AD, January 20, 2014)
Optional LVD Driver Circuit Card
The optional LVD driver circuit card installed in the main bay contains an LVD inhibit switch and indicator. Refer to
circuit cards are 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.
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 3. Optional LVD Driver Circuit Card
J9
J7
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
J6 J5 J4
J3 J2 J1
S1
Switch and indicator located
on circuit card installed in
Main Bay only.
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).
Note: The UP position will not close the LVBD contactor
if the battery is manually disconnected using the
Manual Battery Disconnect Switch.
[5]
Figure 3. LVD driver
Code: UM582127000
Issue AD, January 20, 2014