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Appendix B: Soft Starter Application Considerations

Page B–7Stellar

SR55 Series Soft Starter User Manual – 1st Ed, Rev F – 09/18/2019

b.2.13 – appliCaTion Table (ConTinued)

Table B.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

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 –

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 –

Transformers, voltage regulators Nil Change firing mode

Tumblers 30–100 Can be eccentric load, may need high torque motor

Brand	Automation Direct
Model	Stellar SR55 Series
Category	Controller
Language	English

Automation Direct Stellar SR55 Series User Manual

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