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• Applications with low or medium starting torque
• Lightly loaded applications
• Little or no speed control during run mode
• Reduce mechanical wear and damage to system
• Controlling inrush
• Power monitoring
Soft starters can achieve up to 99.5…99.9% efficiency. Typically, less than 1V is dropped across an SCR. Efficiency is dependent upon the size of the soft starter and the 3-phase voltage applied. After the starting process is complete, a soft start with integrated bypass, as with the SMC-3 and SMC Flex, pulls in an internal bypass contactor. The SCRs are no longer firing and all running current is across the contacts maintaining or improving efficiency. When operating at full speed and properly loaded, soft starters are more efficient than VFDs.
The SMC-50 has a parameter setting to allow energy consumption efficiency when a motor is in an unloaded condition; this setting could potentially save energy costs. The soft starter has the CE mark and should not need extra filtering for harmonics.



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