61
Service Manual
Plus
MICROSPEED
Option
Speed Adjustment with Encoder Feedback
Where: Fenc=the rate factor
PPR= encoder pulses per revolution (line count)
RPM=Motor Velocity Max.
Calculate RENC:
RENC=680000
Fenc.
The resistor RENC determine what is the max. speed of the motor
at 10V of reference. The result of RENC is in Kohm.
The Microspped Plus 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. The value placed in RENC is application dependent. 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 for-
mula, 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 Microspeed
Plus is 250Khz.
Find the rate factor:
Fenc=PPR x RPM
60
Example:
1000 PPR Encoder
3000 RPM Motor Velocity Max.
RENC=680000=13.6Kohm
50000
Fenc=1000 x 3000=50000
60
You will adapt to the nearest commercial value: 15 or 12Kohm value in 1/8
or1/4W.
Once the resistor RENC is inserted, proceed with final speed
adjustment.
Operate using trimmer VEL on the front of the drive.
Clockwise Rotation.....................Speed increases
Counter Clockwise Rotation.........Speed decreases
The Range of regulation is +/- 20%.
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