UPS Means :Uninterruptible power supply
ups provide backup some time .Sudden power failure stops the computer. Thereby, may be impaired computer software and hardware.
The power to the UPS backup works for some time.
There are two types of UPS.
- Online Ups
- Offline Ups
how it works and Block Diagram
Block diagram of (UPS) Offline
offline Ups Works two Mode:
- Ac to Ac Mode
- Dc to Ac Mode
- Ups Circuits
- Filter cicuit
- AVR (automatic voltage regulatory) circuit
- Charging circuit
- Protection, overload, battery low indicate circuit
- Dc to Ac Circuit
- Output Socket
Battery Charging :
If charge battery in 18 volt ----- Boost Charge
If charge battery in 15 volt ----- Semi Boost charge
If charge battery in 13.5 volt ----- Trickle charge
Main Parts of UPS:
Battery => 7 Amp., 12 volt for UPS
20 Amp, 12 volt for inverter
Step Down transformer
6-0-6 / 9-09 /for ups
6-0-6 / 9-09 / 12-0-12 / for inverter
Switching Component
Power Transistor (metal body) 3055/3773
Mosfet
IRF 244N/45N, P55N06,P50N06,7N70,6N60
IRF 150/630/550/540//650
IGBT(Insulated Gate Bipoler Trasnsistor)+Mosfet
Kit
According to VA of ups or Inverter
Cabinet,Switch,Fuse,Wire,Etc.
Faults Findind of UPS
AC Mode Related Fualts
Ups works in Dc mode but does not works in AC mode?
First of all check Input Impidence(by multi-meter).it should not be full or nill.
If full deflection, then short circuit check input wire,line filter circuit,and check step down transformer.
If nill deflection ,then open circuit,check such as input wire,fuse,switch and step down txfr.
input impidence is ok, then check ac volt available on first relay or input relay. If ac volt is ok then check relay,its coil supply and coil connected circuit such as diode,polar capacitor,related /connected Ic and its supply .
Ups works in Dc mode but does not works in AC mode?
First of all check Input Impidence(by multi-meter).it should not be full or nill.
If full deflection, then short circuit check input wire,line filter circuit,and check step down transformer.
If nill deflection ,then open circuit,check such as input wire,fuse,switch and step down txfr.
input impidence is ok, then check ac volt available on first relay or input relay. If ac volt is ok then check relay,its coil supply and coil connected circuit such as diode,polar capacitor,related /connected Ic and its supply .
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