Basics of AC Drives(en)(104s)

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Consideration must be given to the motor and application, which may not be capable of operating at 650 Hz. The MICROMASTER and MIDIMASTER drives are capable of being set to a minimum and maximum speed appropriate for the application. If the minimum speed required is 10 Hz, and the maximum speed required is 60 Hz, then the drives can be programmed for a speed range of 10 to 60 Hz. 01 Hz steps. Internal layout The following illustration shows a typical internal layout of the MICROMASTER and MIDIMASTER.

Braking occurs in quadrants II and IV.

Parameters P002, P003 and P004 are used to set a ramp function. Acceleration and deceleration are separately programmable from 0 to 650 seconds. Acceleration, for example, could be set for 10 seconds and deceleration could be set for 60 seconds. Smoothing is a feature that can be added to the acceleration/deceleration curve. This feature smooths the transition between starting and finishing a ramp. Minimum and maximum speed are set by parameters P012 and P013. Frequency Fmax Accel T1 Run Decel T2 Without Smoothing 56 Accel T1 Run With Smoothing Decel T2 Analog inputs (AIN) Parameter P006 is used to select either an analog or digital reference, or fixed frequency.

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