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Chapter 5 Commissioning
5.1 Speed Adjustment with Encoder Feedback.
For this adjustment both Hall effect and Encoder signals are required from the motor.
This adjustment allows for regulation of motor speed through the use of signals from a 2 channel incremental
encoder.
The functional characteristics, at low speed rotation, increases the resolution of encoder used. Use of an
encoder with at least 500 Imp/Rev is recommended. A frequency multiplication circuit (internal) increases
the Encoder's resolution by 4 times, thereby bettering its obtainable performance.
Example: using an Encoder with 1000 imp/rev (internal), you receive a final resolution of 4000 imp/rev.
The drives are furnished with the adjusted speed resistance RENC pre-installed. Speed
adjustment=3000Rpm Encoder 500 imp/rev at 10V. In case of desired resistance variations open drive and
change the resistor value. For calculations use
the following formula:
Renc = 680000 / Fenc.
The resistor RENC allows for the adjustment of low scale velocity at 10V of reference, to the desired
frequency.
Where:
Fenc = Imp.g x Rpm / 60
Speed Adjustment with Encoder Feedback
Example: N° Imp encoder= 500 -Motor Velociey 3000 rpm
Renc = 680000 / 25000 = 27.2Kohm
You will adapt to the nearest commercial value: 27K o 33Kohm.
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%
BIL
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