Automationdirect.com Stellar SR44, User Manual

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3–7
Table 3.2.13 – Applications
Application
Breakaway
Torque (%FLT)
Remarks
Agitator 35
Air compressor- rotary, unloaded start 25–35
Air compressor- reciprocating, unloaded start 50–100
Air compressor- screw type, unloaded start 30 Usually two-pole motor
Ball mill 30–50 Eccentric load, needs high starting torque motor
Carding machine 100 Often high inertia
Centrifuge 50–90 Usually high inertia
Centrifugal fan- dampers closed 10–25 Usually high inertia
Centrifugal fan- dampers open 10–25 Usually high inertia, very long ramp times
Centrifugal blower- valve closed 25–35
Centrifugal blower- valve open 30–40 Can have long ramp time
Chillers 10–25 Usually started unloaded, two-pole motor
Conveyor- horizontal, unloaded 10–50
Conveyor- horizontal, loaded 100–150
Conveyor- vertical lifting, unloaded 50–85
Conveyor- vertical lifting, loaded 100–175
Conveyor- vertical lowering, unloaded 10–40
Conveyor- vertical lowering, loaded 10–25
Crusher (not rock)- unloaded 25–75 Can be high inertia
Drilling machine- unloaded 10
Escalator- unloaded 25–50 Optimizing feature can be effective
Fan, axial-flow propeller 20–40
Feeder- screw 100–175 Needs high starting torque motor
Feeder- vibrating, motor driven 100–150 Needs high starting torque motor
Grinder- unloaded 10–25 Usually high inertia
Hammer mill 20–125 Eccentric load, needs high starting torque motor
Mills- flour etc. 30–50
Mixer- dry contents 35–75
Mixer- fluid contents 10–40
Mixer- plastic contents 75–125 High torque motor offers advantage
Mixer- powder contents 75–125 High torque motor offers advantage
Pelletizers 50–100
Press, flywheel 50–150 Needs high starting torque motor
Pump- centrifugal 10–25 Soft stopping useful
Pump- positive displacement, piston type 100–175 Needs high starting torque motor
Pump- vane type, positive displacement 100–150 Needs high starting torque motor
Rolling mill 30–50
Saw, band 10–35
Saw, circular 25–50 May be high inertia; Plug brake may be useful
Screen, vibrating 30–60
Travelators, walkways 25 Unloaded starting
Transformers, voltage regulators Nil Change firing mode
Tumblers 30–100 Can be eccentric load, may need high torque motor
Chapter 3: Applications
SR44 Series Soft Starter User Manual
1st Ed, Rev B 07/31/2019