design , supply , installation and commissioning of vfds for conversion of 15 mt eot crane motors operating mechanism from direct on-line ( dol ) to variable frequency drive ( vfd ) at electrical workshop and mechanical workshop of iocl at pdr , conversion of 15 mt eot crane motors operating mechanism , 15t eotcrane motor conversion dol to vfd , 15t eotcrane motor spare vfd set ( supply of vfds ( 01 each for main hoist ( mh ) , long travel ( lt ) and crosstravel ( ct ) motors ) as one ( 01 ) set of spare for both 15mt eot cranes atelectrical workshop & mechanical workshop ) . for more details refer tender technical specification and annexure-h .