UPS Service Training

SESSION-1 UPS – Introduction

Difference between UPS & Inverter Basic working principles of UPS
(i) When the AC main supply is available
(ii) When the AC main supply is not available.
(iii)Automation Section.

Types of UPS
(1)Online UPS . (2)Off line UPS.
Various types Components used in the UPS
Relay/Transformer/Battery/Fuse/fuse holder switches/sockets/panel indicator (LED/Neon Lamp)/meter (volt/Ampere)/Transistor/Mosfet/Ics.

SESSION-2 Switching Transistors & Mosfet’s

Advantages of electronic switch/Transistor as switch/Bi polar Transistor vs Mosfet/comparator/AC Voltage level sensor
Relays
Solenoid/ Relay/ Constructions of Relay, Relay in circuit/ single ,double& triple pole Relays

SESSION-3 PRACTICAL

SESSION-4 Transformer

• Types of Transformer
  • Step down transformer,
  • Step-up Transformer,
  • Auto transformer
• Transformer Ratings(watts/volt/Ampere)
  • Applying DC to Transformer
  • Parts Transformer Coil/ Former/ Bobbin/ Core

SESSION-5 PRACTICAL

SESSION-6 BATTERY:-Rechargeable Battery

• Primary Battery / Secondary Battery / Cell & Batteries / Rechargeable Battery Wet lead – Acid Battery / Dry lead – Acid Battery or Maintenance Free Battery.
• Types of Battery Charger:-(a) Charger using SCR (b) Charging using L 200. (c) Charging using LM317 (d) Trickle charging (e) Diode using charger CHECKING BATTERY VOLTAGE

SESSION-7 Practical for the previous day

SESSION-8 ICs in the UPS Circuit

• LM 324N–Operational Amplifier(op-Amp) What is an OP- Amp
• KA3524 / SG3624 –PWM Controller Oscillator
• CD4073–AND Gate (4) NE555 Timer ( 5) 4N35-Opto Coupler
• LM7812–12 Voltage Regulator (7) CM 317 Adj Regulator

SESSION-9 500VA / 12V UPS Circuit Black Diagram & its Sections

• Oscillator,PWM controller& Out Put Section
• What is PWM,how does this function working of PWM
• Automatic Voltage Regulator (AVR) Section
• Low Voltage cut Section.5. High Voltage cut Section
• Charging Section & Etc.

SESSION-10 Practical for the previous day

SESSION-11 500VA / 12V UPS Circuit Description and working principle

• Oscillator section & its working principle
• Circuit Description
• Mosfet Drive section :- .Circuit description & its working principle
• Out put Section :- Circuit Description & working principle

SESSION-12 PWM (Pulse With Modulation)

• Safety Section:-Circuit Description / working principle & 5V Regulator Supply
• AVR Section : –
  • 1st- AVR Circuits and its working principle
  • 2nd- AVR Circuits and its working principle

SESSION-13 Practical for the previous day

SESSION-14 Voltage cut off Section

• Low voltage cut off Section / working principle
• High voltage cut off Section. / working principle
• Charging Section / working principle
• AC Mains ON / Charging indicator LED.
• Supply to AVR Section / Regulator power supply section
• Charge over Section and its working principle
• No Load Shutdown Section

SESSION-15 Practical

SESSION-16 BATTERY SECTION

• Low Battery Shutdown Circuit and its working principle
• Overload Shutdown Section
• Overload circuit / working principle

SESSION-17 Practical for the previous day

SESSION-18 625VA / 24V OFF LINE UPS

• UPS Description /Ics- Used /Battery Back Up /Out put power main functions
• Ics used in this USP :– SG3524 / LM339 / LM324 / LM73 /CD4011 /555
• CONVERTING 500VA / 12V UPS to 625VA /24V & 1250 VA / 24A UPS
  1 Primary winding / 2. Secondary winding
  3 Charging winding / 4. Transformer weight of wire

SESSION-19 Introduction & Installation of a common 625VA ups

Introduction 2 Front panel / “Replace battery” Indicator {Red led}
“Back up”–indicator {Yellow led} , “Line normal” –indicator {Green led} “On/off/test/silence” button.

SESSION-20 Rear panel

• Computer interface
• Insulation/Placement/Connect computer interface/ Connect to
• main power supply/ Change the battery/Connect the
• loads/Connect the telephone/ Modem lines
• IImpt :- {425Ap/525Ap/625Ap Models only}

SESSION-21 Common Faults and Troubleshooting

Troubleshooting from all sections & Doubt clearing