How to increase the ramp time of a motor being started by an ATS22 Soft start? | Schneider Electric Egypt and North East Africa

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How to increase the ramp time of a motor being started by an ATS22 Soft start?

Issue:

ATS22 seems to ramp the motor up more quickly than my ACC (acceleration) ramp time in the SEt menu?

Product Line:

ATS22

Environment:

ALL

Cause:

Programming

Resolution:

By default the ATS22 is programmed to ramp the torque, in the motor.

However, if the motor is lightly loaded, it may reach full speed before it reaches full torque, causing it to appear that the ACC time is ignored.

If this is an issue, we can disable the torque control by First going to CONF menu and setting LAC to on, then go to ADJ menu and set SSC to off.

The soft start will then simply ramp the output voltage to the motor.

It's still possible the motor will reach full speed, before it reaches full voltage. If that is the case, try reducing ILt ( Set menu), this is the Current Limit, to see if it helps,

although setting ILt too low may cause the soft start to be unable to ramp the motor.

If precise Acceleration is required for the application, it is better to use a Variable Frequency Drive since we have much better control of the motor voltage and frequency.

If changing SSC to OFF causes issues starting the motor, you may need to enable bSt the voltage boost.