We perform following checks in corrective maintenance (CM) of BTS.

AMF & ATS Panel

Fuses before Power meter

SPD(Surge protective device) check

Main power wire connection of ATS

Grounding & earth level ,connection for PMT ,Power meter box, ATS, ACDB

All wire connections for input/output terminal blocks

Cutting, Finishing, Sealing, Jumper Routine, Connector plan

Input/output breakers, MCCB, GENSET MCB ,Main MCB

All Timers and relays, Manual bypass switches and AMF check

Proper settings on AMF panel

Genset frequency, L-N voltages, Remote stop and start and automatic load shifting test

Manual bypass switches check

All main on/off ,phase fail ,under voltage and over voltage test

Tower Light controller and tower lights

Tight all screws and every wire check on every visit

Complete Battery Bank testing

Rectifier and BBU

No joint in AC power cable for rectifier

No lose connection on three phase power, neutral and ground terminal block in rectifier cabinet

Clear all alarms on rectifier module and MCU

Check DC grounding

Check discharging current /almost 52V (±2)

Check that the Battery voltages in every cell are equal during discharging.

BBU module(CC,CH,FS,CVI,SA,SE,FA,PM) Modules LED normal status check

RRU and FS card connected properly

CPRI optical interface self-test check

BTS Alarm System

Low fuel check

DG fail check

DG on load check

DG high temp check

Mains fail alarm check

Line fail alarm check

Fire alarms check

Door open alarm check

Humidity and flood check

Smoke alarm check

Preventive maintenance of BTS

We perform following checks in preventive maintenance (PM) of BTS. 

BTS PM

Call quality testing

All BTS parts should be clean

VSWR measurement

Joint grounding resistance ≤1 check

BTS grounding resistance ≤5 check

Check the feeder cable for water proofing and antenna, end jumper and grounding points

Microwave PM

To check and verify TX power, RX power, TX frequency, RX frequency, IDU capacity, RSL local, RSL Remote

Note RSL value (of all MW) and Transmit Power value

Check the IF cable for weather proofing at antenna end and grounding points

Check if the grounding Cable of IDU/ODU is Present and tight and Value is <=3 Ohms

MW antenna mount, sway arm and bracing are tight

MW fixation, MW IDU labeling, MW Internal alarms, and RSL level for MW.

Meter

Tighten the power terminations at WAPDA Meter, and AC DB

Measure the Phase to Phase voltage of RYG

Measure the Phase to Neutral voltage of RYG

Note input and output voltage of line conductor

AC DC

Tighten the power terminations

Check water protection(Broken/rubber seal damaged)

Clean the AC power distribution box using blower

Automatic Transfer Switch (ATS)

Tighten the power termination and rectifier

Check the alarm indication and display functions

Check the grounding protection cable

Check the surge arrestor

Rectifier test the neutral line current

Measure float volts(52-54V)

Switch over test(Load to be transferred to batteries)

Rectifier modules alarm check

Battery

Complete battery test

Check all connectors

External alarm

Main’s failure

AC Phase Lost

DG in Operation

SMR Failure

DC Low Voltage

Tower Light

Water/Humidity

Smoke/ Fire

If AC Failure

SITE CLEARENCE

Water proofing for all connected jumpers & feeders, power cable

Sealing the disconnected feeder, jumper connectors and proper fixes

Proper routing of Fiber jumper’s power cable

Cleaning the site and check the complete labeling before leaving

Wait for cross feeder, Sector / Partial Swapping and VSWR confirmation from OEM’s team room and confirmation from DT team.

If the site has issues, swap team do rectification immediately until all issues solved.

After the completion of the above work and received the leave approval from war room can leave site.

Send message in Line to inform leaving site

ATP preparation

IMG-20160610-WA0015Capture

Capture

Capture

IMG-20160610-WA0020