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Commissioning
Chapter 5
5.1 Speed Adjustment with Encoder
Feedback.
For this adjustment both Hall effect and Encoder
signals are required from the motor as shown in
Connections on pages 34 and 35.
The MicroB needs to be set up for the motor and Encoder
used to ensure proper operation and speed control.
Use the following formula to determine the correct resistor
value to place in RENC to suit the application. Determine
what the max. speed of the motor will be and find out what
the line count (PPR) of the encoder is before using the formula. This is a two-part formula, the first part gives a factor
based on rate, the second part determines the resistor
value. Keep in mind when selecting the encoders line count
that the Maximum encoder input frequency to the MicroB
is 250Khz.
Find the rate factor:
Fenc=PPR x RPM max
60
Where: Fenc=the rate factor
PPR= encoder pulses per revolution (line
count)
Calculate RENC:
RENC=680000
Fenc.
The resistor RENC determines what the max. speed of
the motor at 10V of reference. The result of RENC is in
Kohm.
Continued
Service Manual
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