38
Service manual
MicroStar B
rev06
MicroStar B
09
09
09
09
09
Adjustement with encoder feedback
Example:
N° encoder (PPR) = 1000
Motor max. speed 3000 rpm
Where:
RENC = 680000 / Fenc
Fenc = PPR * rpm / 60
Fenc = 1000 * 3000 / 60= 50000
RENC = 680000 / 50000 = 13,6 kohm
RENC resistor calculations
Encoder feedback
3.1
Internal setting for
encoder feedback
Solder
bridges
RENC
resistor
For this adjustment both Hall effect and Encoder signals are required from the Brushless
motor as shown in Connections on Chapter 2.3 , 2.4 and 2.5
For Brush dc motor only Encoder is required as shown in Connections on Chapter 2.6
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 formula, the first part gives a factor based on rate, the second
part determines the resistor value.
The resistor RENC determine what is the max. speed of the motor at 10V of reference.
The result of RENC resistance is 12 or 15 Kohm. Prefer resistance with 1% tolerance.
Once the resistor RENC is inserted, proceed with final speed adjustment.
Operate using trimmer VEL on the front of the drive. With Clockwise Rotation the speed
increases. With Counter Clockwise Rotation the speed decreases
The Range of regulation is about +/- 20%.
