Page 5 of 28
Rev. A
2 Block Diagram
The Block diagram of Vesta series (refer to Figure S-1) is divided into the following parts:
2.1 Main Relay ( MAI N- RY) :
I t’s to switch the UPS between line mode and battery mode.
2.2 Boost Relay ( BOOST- RY) :
At line mode, this is a switch used to boost UPS output voltage 18% when the utility
voltage is under line boost activated point. (Refer to Boost activated point table in
P.4)
Relay OFF: line voltage is normal
Relay ON: line voltage is under line boost activated point.
2.3 Buck Relay:
At line mode, this is a switch used to lower UPS output voltage 15% when the utility
voltage is over line buck activated point. (Refer to Buck activated point table in P.4)
Relay OFF: line voltage is normal
Relay ON: line voltage is over line buck activated point
2.4 Main Transformer ( MAI N TX) :
The Main transformer has three functions:
2.4.1 I nverter Transformer
I t provides voltage to UPS output and performs a full-bridge transformer
when UPS is at battery mode.
2.4.2 Boost/ Buck
The output coils have an output ratio. Thus the output voltage at boost mode is
given by (Boost Relay ON):
V
OUT
= V
I N
* 1.18
The Buck relay is ON when the utility voltage is beyond line buck activated point.
I t can lower 15% of input voltage:
V
OUT
= V
I N
* 0.85
2.4.3 Charger:
The battery is charged by the mains through transformer and full-bridge
inverter.
2.5
Line Sense
The MCU detect the mains by input voltage and frequency signals converted from
the amplifier.
Summary of Contents for 1500 Series
Page 2: ...Page 1 of 28 Rev A UNINTERRUPTIBLE POWER SYSTEM SPECIFICATION EP 1000 1500 2000 Series ...
Page 9: ...Page 8 of 28 Rev A Figure S 2 Control Power Circuit CH1 C15 å GND Figure W 1 Cold Start ...
Page 11: ...Page 10 of 28 Rev A Figure S 3 B Charger Control Circuit ...
Page 16: ...Page 15 of 28 Rev A CH1 DS N CH2 Output Voltage 1 200V Figure W 3 Control logic 1 ...
Page 19: ...Page 18 of 28 Rev A Figure S 6 CPU Control Circuit ...
Page 23: ...Page 22 of 28 Rev A Figure S 8 B 6 LEDs Display Circuit ...
Page 28: ...Page 27 of 28 Rev A Figure W 7 Battery Mode Examination Flowchart ...
Page 29: ...Page 28 of 28 Rev A Figure W 8 Line Mode Examination Flowchart ...
