Xtreme Power Conversion Corporation
M90 & M90L Service Manual
Page 11
Uninterruptible Power Supply
Function explanations for each PCBA
PCB information of Power module
M90
Item
PCBA Name
PCBA serial number
Quantity
Remark
1
STS Main Board
71-301695-xxG
1
2
Communication Board
71-300826-xxG
1
3
SPS Board
71-301616-xxG
2
4
Interface Board
71-300869-xxG
1
5
EMI Board
71-301675-xxG
1
6
Panel Main Board
71-301704-xxG
1
7
Panel Key Board
71-300846-xxG
1
8
Panel LED Board
71-300528-xxG
1
9
Parallel Board
71-300821-xxG
1
PFC board (Power Factor Correct Board)
The PFC board consists of Rectifier and PFC/Booster.
When UPS works in line mode, the Rectifier and PFC will work, It changes the AC power to DC power stored in
the BUS capacitor. When works in Battery mode, the PFC will only work as boost to get the higher DC power.
INV board (Inverter Board)
The INV Board includes STS and Inverter. It supplies the power for the system, and it converts the
DC power to a pure sine waveform, in the purpose of less or no transfer time, there is one
STS.
CNTL board (Control Board)
The CNTL board is the core of the UPS system. It controls the actions of the semiconductors and other mechani
-
cal switches.
COMM board
(Communication Board)
The COMM board is charged of display of the LED/LCD, the communication with the computer, and other impor
-
tant tasks
IPOP board
There are charger, input and output EMI on IPOP board. The charger is fully charged the battery capacity. Input
EMI and output EMI are interference prevention at conducted and radiated.
Pre-charger board
The Pre-charger board function is Pre-charging BUS capacity.
Parallel board
The Parallel board is used for parallel communication when the UPS system is running in parallel mode.
Panel Main/LED/key board
The Panel board provides LED and LCD display to the users.