CONSIDERATIONS REGARDING THE MAINTENANCE OF VARIABLE

FREQUENCY DRIVES

Introduction

Many applicationswith VFD in theindustry

Adequatemaintenance isneeded

Correctivemaintenance

No trainned staff

Metodology

Establishing a standard maintenance procedure, which optimizes the time of intervention of the equipments and prevent fatal failures

Metodology

Annual preventive maintenance

Scheduled visits 4 to 6 in one year

Corrective maintenance

Telephone or Web assistance available

Preventive maintenance

Runningconditions

Shut off Start up

Running conditions

Parameter Backup Waveform

measurements

Event logs General working

conditions

Shut off Maintenance

Cleaning andinspection

Tightening ofconnections

Check of powerelectronics andcapacitors

Start up

Measurement ofelectrical values

Optimization ofapplicationpreformance

Scheduled visits

Historic registerof preformance

Enviromentconditions

Spare parts

Corrective maintenance It is not recommend

using it as the only tool

The main goal is to returnto the normal operationquickly

Training

To train the staff in the operation of the equipmentand Troubleshooting

Autonomy of the plant maintenance team

Maintenance contracts

Quotation req (Customer)Offer (Provider)Offerr reception and analisys (Customer)Purchase order (Customer)PO aceptation (Provider)Payment (Customer)Solution (Provider)

Service requirement (Customer)Solution (Provider)

Without ContractWith contract

This contract offers to the customer a simple and fast (no administrative delays) solution for non common problems.

Conclusions This methodology

looks for eliminating corrective maintenance as the only tool

Trained staff is an important maintenance support

Conclusions

Properly management of spare parts

Always count on specialists

Extend the life of the drives

It minimizes the time of detention due to equipment failure

Thank You

Diego Valdivia P. Jorge Quinteros G.