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For example, the power might be limited to under 200% of the motor nameplate without putting stress on the power source. Motors need enough torque to overcome the load torque demand, so remember to consider factors like motor sizing to the load and type of motor.
A soft starter can limit the current to 200%, doing so also limits the amount of torque applied. Further investigation, using wizards, is used to help determine whether the current limit is enough to start the motor.
A drive can provide higher torque levels while remaining below the current requirement of the power distribution system.
Fans
Almost any application that uses constant running speed is appropriate for the soft starter. A large drying fan in a factory that runs all day at a constant speed once it is started is a good example. The soft starter can control the starting torque to the fan to provide a smooth start. Once at speed, no control is needed until a stop command is provided.
A large fan that varies the speed throughout the process, for example changing speed based on temperature, is controlled better by using a drive. A drive can control the speed any time during the process.
Conveyors
It is better to use a soft starter when you replace DOL starters to prevent material spillage or damage during starting and stopping on a conveyor. The soft starter smoothly starts and stops the conveyor without mechanical stress.
Pumps
Pump applications can use either a drive or a soft starter. The soft start can reduce water hammer on both the start and the stop, and is and usually less expensive.

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