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Is it possible to run motors in parallel with one ATS48.

With one ATS48, there is no particular problem to supply motors in parallel.
Take care about the total motors current to size the ATS48.
Remark: you can compare CLP=ON and CLP=OFF to have the best result.
Take care, motors may be connected in parallel provided that the power limit of the starter is not exceed (the sum of the motor current must not exceed the nominal current of the starter selected depending on the type of application). Provide thermal protection for each motor
In function of the running in the application, perhaps that CLP have to set at OFF to avoid the instability. 
For proper sizing; Refer to attachment.

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