Applications for Variable Frequency Drives

Please see the chart below to select which power rating your application falls under: Light, Normal or Heavy Duty. Hours of operation per day, elevation and the type of application can affect your VFD selection. For example, a 15hp AC Motor used in a plastic extruder would require a higher rated VFD than the same 15hp AC motor used in a hosting winch application.
Waste Water
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Concentrator (central drive) Light Light Normal
Filter presses Light Normal Normal
Vacuum filter Light Normal Normal
Flocculation agitator Light Light Normal
Aerator Heavy Heavy Heavy
Circular aerator - Normal Heavy
Brush aerator - - Heavy
Screening plant Light Light Normal
Circular and longitudinal scrapers Light Normal Normal
Collectors Light Light Normal
Sludge Collectors Light Light Normal
Pre-concentrator - Light Normal
Sludge compressor Normal Normal Normal
Achimedian screw water pumps Light Light Normal
Water turbines - - Heavy
Settling tanks Light Light Light
Chemical substance loaders Light Light Normal
Dehydration screens Normal Normal Normal
Slag crushers Normal Normal Normal
Slow or fast mixers Normal Normal Normal
Pumps
Impeller pumps Light Normal Normal
Displacement pumps 1 piston Normal Normal Heavy
Displacement pumps >1 Piston Light Normal Normal

Excavators
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Bucket chain - Normal Normal
Tippers - Normal Normal
Tracklaying vehicles Light Normal Heavy
Bucket Wheels
as pick-ups - Normal Normal
for original material - Heavy Heavy
cutting heads - Heavy Heavy
slewing gear* - Normal Heavy
Dredges
Conveyers Light Normal Normal
Cutting head drives Normal Normal Normal
screens Normal Normal Normal
stackers Light Light Normal
hoisting winches Light Light Normal

Mining
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Crushers Normal Normal Heavy
Vibrators and screens Normal Normal Heavy
Slewing gear - Normal Heavy
Bucket Wheel Excavators
Grinding machine for sand Light Light Normal
Hammer mills Normal Normal Heavy

Chemical Industry
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Plastics
Extruders (plastics) - Normal Normal
Extruders /w variable speed Normal Normal Normal
Extruders /w fixed speed Normal Normal Normal
Batch kneaders Normal Normal Normal
Continuous mixers Normal Normal Normal
Mixing plant Light Light Light
Calendars Normal Normal Normal
Blower units Normal Normal Normal
Coating Light Light Light
Films Light Light Light
Pre-shedder Normal Normal Normal
Bars Light Light Light
Sheets Light Light Light
Tubes Light Light Normal
Rubber
Extruders (rubber) - Normal Heavy
Rubber kneader - Heavy Heavy
Continous mixers Normal Normal Normal
Refiners - two-cylindar Normal Normal Normal
rubber rollers (2 in series) Normal Normal Heavy
rubber rollers (3 in series) - Normal Heavy
Heating rollers Normal Normal Normal
Rubber calenders - Normal Normal
Calenders - Normal Normal
Cooling Drums - Normal Normal
Mills Normal Normal Heavy
Sheet rollers Normal Normal Heavy
Refining rollers Normal Normal Heavy
Mixers
for homogeneous material - Normal Normal
for inhomogeneous material Normal Normal Normal
Agitators for Agitated Materials
with uniform density Light Normal Normal
with varying density Light Normal Normal
with uneven gassing Normal Normal Heavy
Toasters Light Normal Normal
Centrifuges Light Light Normal

Iron Smelting Metal Production and Processing
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Sheet turning device Light Light Light
Block press Light Light Light
Reelers - Normal Normal
Cooling bed scrapers - Normal Normal
sheet pusher Normal Normal Normal
Winders / Coilng machines - Normal Heavy
Cutting rollers Normal Normal Normal
Wire-pulling machines Normal Normal Heavy
sheet metal bending machines* - Light Light
Roll-Aligning Machines
Roller conveyors - continuous - Normal Normal
Roller conveyors - intermittent - Heavy Heavy
Tube reversing - Heavy Heavy
Shearing
General Heavy Heavy Heavy
Continuous cutting* - Normal Normal
Cranked cutting* Light Light Light
Continuous casting drivers* - Normal Normal

Rollers
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Sheet metal reversing - Call Call
Sheet slab reversing - Call Call
Wire reversing - Heavy Heavy
Thin sheet metal reversing - Heavy Heavy
Thick sheet metal reversing - Heavy Heavy
Roller adjusters Light Light -

Energy
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Frequency converters - Heavy Heavy
Water wheels - - Normal
Water turbines - - Heavy
Electricity generators Light Light Light

Conveyor Plant
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Bucket conveyors - Normal Normal
Bucket conveyors /w centrifugal emptying Light Light Light
Conveyor reels Normal Normal Normal
Loaders
Plate feeder Light Light Normal
Belt feeder Light Light Light
Table feeder Light Light Light
Swivelling loader Normal Heavy Heavy
Helical loader Light Normal Heavy
Conveyors /w evenly distributed load Light Light Light
Conveyors Heavy duty Light Normal Normal
Conveyors /w unevenly distrubted load Light Normal Normal
Belt conveyors = 100kW Light Light Normal
Belt conveyors >100kW Light Normal Normal
Goods lifts - Light Normal
Vertical conveyors - other - Normal Heavy
Passenger lifts* - Normal Normal
Slat conveyors - Light Normal
Vibrators and screens Normal Heavy Heavy
Swinging or vibrating conveyors Normal Heavy Heavy
Escalators Light Normal Normal
Rail vehicles - Normal -
Elevators
Loading Light Normal Normal
Gravity emptying Light Light Light
Hoisting Winches*
Heavy Duty Normal Normal Heavy
Medium Duty Light Normal Normal
Inclined lifts Light Normal Normal

Wood Industry
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
General
Debarking macines - spindle feed Light Normal Normal
Main drive Normal Normal Heavy
Conveyors - Burners Light Light Normal
Main or heavy duty Normal Normal Normal
Main trunk Normal Heavy Heavy
Sawing, carousel Light Light Normal
Conveyors
Plate Normal Heavy Heavy
Transfer Light Normal Normal
Chains
Floor Normal Normal Normal
Green wood Normal Normal Heavy
Manual Sawing
Chain Normal Normal Normal
Work driver Normal Normal Normal
Paring Cylinder Normal Heavy Heavy
Feeds
Trimming machine Light Normal Normal
Multiple blades Normal Normal Normal
Cutter Light Light Normal
Stacked trunks Normal Normal Normal
Trunk conveyor - ramp with wheels Normal Normal Normal
Trunk tipping device Normal Normal Normal
Paning machine feed Light Normal Normal
Trunk tipping roller trains Normal Normal Normal
with rollers Light Light Normal
Selection table Light Normal Normal
Roller train with tilting table Normal Normal Normal
Positioning Platforms
Chain Normal Normal Normal
Track Normal Normal Heavy
Plate drive Light Light Normal
Drives for veneer turning machines Light Light Normal

Compactors
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Compactors Heavy Heavy Heavy

Cranes***
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Cranes and Lifting Gear
Slewing gear* Light Normal Normal
Derricking gear Light Light Normal
Bridge trolleys for portal cranes Call Call Call
Bridge trolleys for portal cranes Normal Normal Heavy
Lifting gear Light Light Normal
Luffing gear Light Light Normal
Repair Docks
Main pulley system Call Call Call
Auxilary pulley system Call Call Call
Arm pulley systems Call Call Call
Yaw drive Call Call Call
Traveling drive Call Call Call
Industrial Use
Main pulley system Call Call Call
Auxiliary pulley system Call Call Call
Bridge cranes Call Call Call
Traveling drive for crane car Call Call Call

Mills and Drums
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Cooling and drying drums - Normal Normal
Rotary kilns - - Heavy
Ball mills - - Heavy
Coal mills - Normal Normal
Rotary Mills
Ball and rod mills Heavy Heavy Heavy
Cylindrical ring gear Heavy Heavy Heavy
Direct coupling Heavy Heavy Heavy
Cement kilns Normal Normal Normal
Dryers and coolers Normal Normal Normal

Foodstuffs Industry
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Cane sugar production
Sugar cane knives* - - Normal
Sugar cane mills - - Normal
Diced mash - - Light
Extraction system, cooling machine, boiler - - Normal
Beet washing, cutting machine - - Normal
Beet peeling machine Heavy Heavy Heavy
Oil mills Normal Normal Normal
mills (low speed) Normal Normal Heavy
Kneading machines Light Normal Normal
Mincing machines Light Normal Normal
Slicing machines Light Normal Normal
Crushers and mills - - Normal
Drying drums - Light Normal

Paper Machines / Paper and Cellulose Industry
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
All types*** - Heavy Heavy
Pulper Drives
Debarking drums and machines Normal Heavy -
Rollers (pick-up, screen suction & screen feed) - Heavy Heavy
Drying cylinders (roller bearings) - Heavy Heavy
Calenders (roller bearings) - Heavy Heavy
Filters (pressure and suction filters) - Heavy Heavy
Chopping machines & shredders Normal Heavy Heavy
Jordan mills - Normal Heavy
Presses (bark, felt, gluing & suction presses - - Normal
Rolling devices - - Normal

Hdyrapulpers
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Washing filters - - Normal
Yankee cylinders (dryers) Light Light Normal
Agitators (kneaders) Normal Normal Normal
Agitators for pure liquor Light Light Light
Paring cylinder Heavy Heavy Heavy
Debarking machines (mechanical) Heavy Heavy Heavy
Refiners Normal Normal Normal
Paper Shredders Light Light Light
Calenders Light Light Light
Shredders Heavy Heavy Heavy
Chip loaders Normal Normal Normal
Patination cylinders Light Light Light
Conveyors
Chips, bark, chemicals Light Light Light
Trunk (including table) Heavy Heavy Heavy
Sleeve presses Light Light Light
Millers Heavy Heavy Heavy
Cylindrical tools Light Light Light
Dryers
Paper machine Light Light
with conveyors Light Light Light
Embossing machines Light Light Light
Extrusion presses Normal Normal Normal
pulp refiners Normal Normal Normal
kiln drives Normal Normal Normal
Paper rollers Light Light Light
Plates Normal Normal Normal
Presses - mat and suction Light Light Light
Kneading machines Heavy Heavy Heavy
Vacuum pumps Normal Normal Normal
Flat reelers Light Light Light
Screens
Chips Normal Normal Normal
Rotating screens Normal Normal Normal
Vibrating screens Heavy Heavy Heavy
Glue presses Light Light Light
Super calender Light Light Light
Concentrator (AC motor) Normal Normal Normal
Concentrator (DC motor) Light Light Light
Coiling and uncoiling holders Normal Normal Normal
Surface rinsing machines Light Light Light

Pumps
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
pumps - Normal Normal
centrifugal pumps / impeller pumps Light Normal Normal
Piston pumps (1 cylinder) Normal Normal Heavy
Piston pumps (multiple cylinder) Light Normal Normal
Archimedian pumps - Light Normal
Rotary pumps (gear, vane, positive displacement rotary pumps) - - Light

Agitators and Mixers
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Agitators for liquids Light Light Normal
Agitators for liquids (/w suspended solids) Light Light Normal
Agitators for liquids (variable density) Light Normal Normal
Agitators for solid media (inhomogeneous materials) Normal Normal Normal
Agitators for solid media (homogeneous materials) - Normal Normal

Cable Railways
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Materials cableways - Normal Normal
Pendulum cableways - Normal Heavy
Ski tows - Normal Normal
Circulating cableways - Normal Normal

Screens
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Air Washers Light Light Light
Rotary screen - stone or gravel Light Light Normal
Mobile screens with water input Light Light Light

Textile Machinery
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
General Light Light Normal

Ventilators and Fans
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Centrifugal fans Light Light Light
Pressure ventilated fans Light Light Light
Push-pull counterflow fans Normal Normal Normal
Industrial and mining fans Normal Normal Normal
Blowers (axial and radial) Normal Normal Normal
Centrifugal blowers Light Light Light
Rotary blowers Light Light Normal
Rotary vane blowers Light Light Normal
Heat exchangers Normal Normal Normal
Cooling tower fans - - Normal
Dry cooling towers - - Heavy
Wet cooling towers Heavy Heavy Heavy

Compressors
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Piston compressors - Heavy Heavy
Rotary compressors - Normal Normal
Radial compressors - Normal Normal
Screw compressors - Normal Normal
Centrifugal comressors Light Light Normal
Rotary vane compressors Light Light Normal
Multi-cylinder reciprocating piston compressors Normal Normal Normal
Single cylinder reciprocating piston compressors Normal Normal Heavy

Cement Industry and Clay Processing
Application Up to 5
Hours/Day
5-10
Hours/Day
Over 5-10
Hours/Day
Concrete mixers Normal Normal Normal
Crushers* Normal Heavy Heavy
Rotary Kilns - - Heavy
Tube mills - - Heavy
Separators - Normal Normal
Rolling mills - - Heavy
Brick presses Normal Heavy Heavy
Tile presses Normal Heavy Heavy
Kneading machines Light Normal Normal

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