The purpose of this post is to show the commonalities and differences between a soft starter and a
variator. By comparing these two pieces of equipment, you should be able to choose the best one for your intended use.
want to do it.
Most comparisons are between Allen-Bradley SMC intelligent motor starters and
AC variable frequency drives
The question seems simple, but the answer is not. However, if you examine the function and purpose of the starter
progressive and dimmer, the response becomes clearer. In general, the application determines the best choice.
Common questions to ask are:
• Does the application require rated torque at zero speed?
• Does the application require speed regulation once the motor speed is reached?
• Does the application require constant torque?
• Does the application need precise start and stop times?
• Is space a consideration?
This post explains some of the differences between these two starter types and the criteria for choosing
one rather than the other.
Control scheme
The control circuit is supplied with 24V~ by a transformer and its protections F2 and F3.
If thermal relay F1, emergency stop S1 and stop BP S2 are not activated, pressing BP S3 causes the motor to turn in the direction defined by KM1.
Ditto for the other direction (KM2) with BP S4.
Memorization (the pushbuttons can be released) is ensured by the respective closing contacts of KM1 and KM2.
It is impossible to control the 2 directions simultaneously thanks to the opposite opening contacts of KM1 and KM2 (electric locking).
LED H2 indicates power on, LED H1 indicates overload fault.
The purpose of this post is to show the commonalities and differences between a soft starter and a
variator. By comparing these two pieces of equipment, you should be able to choose the best one for your intended use.
want to do it.
Most comparisons are between Allen-Bradley SMC intelligent motor starters and
AC variable frequency drives
The question seems simple, but the answer is not. However, if you examine the function and purpose of the starter
progressive and dimmer, the response becomes clearer. In general, the application determines the best choice.
Common questions to ask are:
• Does the application require rated torque at zero speed?
• Does the application require speed regulation once the motor speed is reached?
• Does the application require constant torque?
• Does the application need precise start and stop times?
• Is space a consideration?
This post explains some of the differences between these two starter types and the criteria for choosing
one rather than the other.
Control scheme
The control circuit is supplied with 24V~ by a transformer and its protections F2 and F3.
If thermal relay F1, emergency stop S1 and stop BP S2 are not activated, pressing BP S3 causes the motor to turn in the direction defined by KM1.
Ditto for the other direction (KM2) with BP S4.
Memorization (the pushbuttons can be released) is ensured by the respective closing contacts of KM1 and KM2.
It is impossible to control the 2 directions simultaneously thanks to the opposite opening contacts of KM1 and KM2 (electric locking).
LED H2 indicates power on, LED H1 indicates overload fault.
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