Servicing A Ups

Servicing Line Interactive UPS

SERVICE Ram Engineering and Controls Secunderabad

Introduction ....

Computer peripherals require service UPSs are amongst items which require maximum service support.

Function of a UPS • Power a PC with monitor • Use Mains power, when available • When Mains fails, provide power from battery • When mains is restored, recharge battery • Indicators on a UPS Green on Mains Red on Battery

What are the components

A UPS

A Power Source • The mains chord of the UPS should be connected to a AC socket.

And Load (PC/ 60 - 140 W Bulb) • The load should be connected to the sockets in the back panel of the UPS • In the picture shown a bulb is connected

Load

Connect load to sockets in the back of UPS

Now test the UPS • Switch on Mains • After 5 seconds the UPS ON (Green) lights up • Switch on the UPS, Load should come on • Switch off mains supply • The Load should continue to be on • UPS ON indicator should be RED PROBLEM ?

Press Enter/

Common Problems… 1. No Output 2. PC works on Battery but not on Mains 3. PC works on Mains but not on Battery 4. Low Backup of less than 5 minutes 5. PC reboots when Mains fails/ restores (Sometimes customer may report this as no backup) Press Enter/ Click

… & Solutions

… & Solutions 1. No Output Item to Check

Possible Problem Suggested Solution

Switch

Possibly Failed

Replace if failed

Output Resistance

Opens when heavily over loaded in Mains Mode

Replace if failed

Wires

Possible Dry Solder

Repair if required

Press Enter/ Click

… & Solutions 1. No Output

Switch

Output Resistanc e

… & Solutions 2. PC works on Battery but not on Mains Item to Check

Possible Problem Suggested Solution

Mains Chord

Possibly Failed

Replace if failed

AC socket

May be no supply

Change if needed

Wires from fuse, switch

Possible dry solder

Solder if needed

Control Card

Circuit, Relay Failure

Replace Card

Connectors

Press Enter/ Click

… & Solutions 2. PC works on Battery but not on Mains

Control Card Input socket

… & Solutions 3. PC works on Mains but not on Battery Item to Check

Possible Problem Suggested Solution

Battery Connector

May be loose

Tighten if loose

Control Card

MOSFET Blown

Replace

Relay Problem Ics failed

Press Enter/

… & Solutions 4. Low Backup of less than 5 minutes Item to Check

Possible Problem Suggested Solution

Erratic Mains Supply

Battery does not get charged fully

Charge for atleast 8 Hrs before checking

Control Card

Battery does not get charged fully

Replace Control Card. Charger failed

Battery

Battery weak or dead

Replace after checking item 1 & 2 above

Press Enter/

… & Solutions 4. Low Backup of less than 5 minutes

Control Card Battery

… & Solutions 5. PC reboots when Mains fails/ restores Item to Check Control card

Battery

Possible Problem Suggested Solution Battery not getting charged

Replace Card. Charge for at least 8 Hrs before checking

Battery weak or dead

Replace after checking item 1 above

Press Enter/

… & Solutions 5. PC reboots when Mains fails/ restores

Control Card Battery

Dis-Assembling Check before Dis-assembling a UPS 1. Note the Serial No. in the back of the UPS 2. If the Serial No. sticker is tampered with or removed, the warranty is void. 3. Check for any signs of tampering with the UPS. If it is tampered by any unauthorised person, then also the warranty is void. Press Enter/ Click

Dis-Assembling Dis-assembling a UPS 1. Lay the UPS on dust free surface 2. Open the cover screws 3. Care fully Disconnect the battery

Dis-Assembling Dis-assembling a UPS 4. Unplug connectors 1 to 4 on PCB 5. Un-Screw the Lugs on heat sinks

1 2 3

4

5

6

Dis-Assembling Dis-assembling a UPS 6. Un-Screw the PCB by removing fixing screws 1 to 4. Note : Preserve the Fibre washers under the PCB carefully

1

4

2

3

Dis-Assembling Location of important components

Output Power Resistance Transform

Battery

Re-Assembly Keep all components in one place 1. Fix Battery, if removed. 2. Fix PCB with screws. Ensure fiber washer under the PCB in the front. 3. Fix the connections to the Heat Sink. 4. Plug all the connectors 1 to 4 carefully. 5. Connect the battery, ensure that the lugs are tight. Note : Fix Fiber washers under the PCB without Fail

Press Enter/ Click

Thank You