Alpha Technologies CXPS 48-1.2-225 48 Vdc - Manual (Page 13)

053-691-B1 Rev E Page 5 of 33
2.2.2 Low voltage battery disconnect (LVBD)
A low voltage disconnect (LVD) is installed in series with the batteries. This is called a low voltage battery
disconnect (LVBD).
2.2.3 Shunt
A shunt is installed in series with the batteries for current measurements. The controller automatically calculates
the load current.
2.2.4 Internal alarm card
The distribution center includes an alarm card, a low voltage disconnect override switch, and a breaker trip LED
indicator.
The alarm card provides terminal block access to internal signals such as binary alarms for breaker trips and
LVDs, alarm relays for driving the LVDs, and analog inputs for current (shunt) and voltage measurements. The
terminal block provides a single access point between these signals and an external system controller. Refer to
the customer connections (“–08”) drawing at the rear of this manual for details on terminal block assignments.
The LVD override switch allows the user to override the LVD during controller maintenance. A green LED
illuminates when the LVD is operating normally. A yellow LED illuminates when the LVD is in the override
position.
Figure 3–Internal alarm card
LVD override switch
I/O customer connection points