Power Connections
Page 9
May 2020
DSY-PM-01378-EN-08
POWER CONNECTIONS
Standard
The power supply used in the B2900 monitor is an internal lithium 3�6V DC D cell that
powers the monitor for about six years when no outputs are used� The monitor can also
get power from a 4…20 mA current loop� See
� If the current loop is used, a sensing
circuit within the monitor detects the presence of the current loop and disconnects the
battery from the circuit�
JP1
JP2
JP3
Input
Total P
ulse
Signal
P1
Freq. In
4-20mA
Iso Total Pluse
RS485 Gnd
Setpoint 1
Setpoint 2
Gnd
+
–
+
–
+
–
Total Reset
OC Total Pluse
Signal Gnd
TB1
Mag
Pulse
Iso
OC
Low
High
4…20 mA
Current Loop
(10…28V DC)
Load
10…28V DC
RS485 B (–)
RS485 A (+)
Figure 5: Loop power connections (NEMA 4X)