Alpha Technologies FXM350_Micro350 UPS - Manual (Page 38)

017-241-B0 Rev B 36
6. Theory of Operation
6.1 Block Diagram
Figure 24 shows the eight PCBs in the FXM350 and the communication path between them.
Figure 24 — FXM 350 block diagram
LINE FREQUENCY
TRANSFORMER
AC INPUT
DC INPUT
& OUTPUT
LCD DISPLAY
DRY CONTACTS & EXTERNAL
SIGNALS OUTPUTS AND USER &
BATTERY TEMPERATURE INPUTS
120
INV
120
108
132
N
MAIN BOARD
DC EMI
BOARD
AC EMI
BOARD
DRY CONTACTS
BOARD
MICROCONTROLLER
BOARD
INTERFACE
USER
COMM
MODULE
HEATER MAT
RELAY BOARD
HEATER
MAT OUTPUT
6.2 Modes of Operation
The following list of operation modes is explained in the following sections.
• Line mode
• Backup mode
• Standby
• Shutdown
• Fault