Technical information

8 – THEORY OF OPERATION
Acceleration Control
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Note: Depending on loading, the motor may achieve full speed at any time during the Power ramp.
This means that the Maximum Power level may not be reached. Therefore, the maximum power
level is the maximum power level that is permitted. However, the motor power may not necessarily
reach this value during all starts.
Ramp Time When in Power acceleration mode, the ramp time setting is the time it takes for the power to go from
the initial power setting to the maximum power setting. To make the motor accelerate faster,
decrease the ramp time. To make the motor accelerate slower, increase the ramp time.
If the ramp time expires before the motor reaches full speed, the starter maintains the Maximum
Power level until either the motor reaches full speed, the UTS timer expires, or the motor thermal
overload protection trips.
Note: Setting the ramp time to a specific value does not necessarily mean that the motor takes that
exact amount of time to accelerate to full speed. The motor and load may achieve full speed before
the ramp time expires if the load does not require the set ramp time or set power level to reach full
speed. Alternately, the motor and load may take longer than the set ramp time to achieve full speed
depending on the parameter settings and load level.