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9. Signalling Circuit Connections
The Sentra XL circuit is made up of the three PCBs shown in the following schematic.
Outlet
Relay
Switch
Line Input
K board
Input
Voltage
Sensor
Output
Current
Sensor
Output
Voltage
Sensor
Main
Transformer
D board
I board
To PC
RS232
Port
USB
Port
SNMP
Port
CPU
M board
Driver
Circuit
Inverter
Battery
Charger
Filter
LCD
Display
Fan
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