Service manual

5.3 PCBs of the UPS

This UPS system contains two major PCB assemblies. They are including:

1.PSDR: Contains major converter of the UPS (1) PFC converter, (2) DC-DC converter (3)

inverter (4) SPS (switching power supply) and necessary sub-circuit for

complement and supporting major converter which have been modulized,

Includes: a) Standard charger module (for standard model only), b) DCDC

controller module, c) PFC controller module, d) Fan driver module, e) IGBT driver

module and appropriate sensors and conditional circuit for the system regulation

and protection.

2.CNTL: Contains major parts of protection, signaling circuits, regulation and control circuits

of inverter.

3.I/P EMI Input EMI filter

4.O/P EMI Output EMI Filter

5 Charger For Long backup time model product, there is a independent super charger boards

6.LCD Panel The Panel PCB provides system information with LCD indicators, and button for

turning ON/OFF The UPS.