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Starting a Motor with Soft Starters - A Galco TV Tech Tip | Galco

3,107 views · Published 15 December 2016 · 2:04 · Indexed 1 November 2026

Channel: GalcoTV · 2016 · Science & Technology

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To start an electric motor, it simply needs to be connected to a power supply with correct voltage and enough ampacity to get it to full speed before tripping or faulting out. There are a few different types of motor controllers to choose from:
A. Line Starters
B. Soft starters
C. And VFDs

Soft Starters are electronic units capable of providing reduced voltage to the motor until it reaches a percentage of full speed before it goes to full output voltage. Like the line starter it measures motor current to protect it from overheating and overloading. This type of unit also lets you adjust Accel/Decel time, Current limit, and Over Load class of starting (class 10 ,class 20 etc.). It accomplishes this by the use of SCR’s connected back to back in each of the 3 phases, or a total of 6 SCRs. Current transformers or Hall effect sensors measure the motor current and provide the necessary feedback to the Electronic Control Board to allow the unit to protect the motor effectively.

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With respect to the usage, installation or assembly of any products described in this video, Galco Industrial Electronics, Inc., a Michigan corporation, encourages you to follow the requirements and/or guidelines of:  i) the Occupational Safety and Health Act of 1970, Public Law 91-596, as amended,  and all laws, rules and regulations implemented in relation thereto;  ii)  the National  Electric Code®;  and  iii) NFPA 70E®.  Any installation, assembly or work described in this video should be performed by a qualified licensed electrician.
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