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FAQ
How are Velocity and acceleration scaled?
 
 
How are Velocity and Accceleration scaled?
 
 
The register V_SOLL(5) and A_SOLL(6) are scaled values.
 
Normally the Velocity values are like this for incremental encoders:
MAC050-141:
100 RPM = 210 units
MAC400: 100 RPM = 284 units
MAC800, 1000, 1200: 100 RPM = 277 units
MAC1500-4500: 100 RPM = 284 units
 
And for the accelerations they are like this:
MAC050-141:
10 units = 2484 RPM/s
MAC400: 10 units = 2708 RPM/s
MAC800, 1000, 1200: 10 units = 2773 RPM/s
MAC1500-4500: 10 units = 2708 RPM/s
 
But since the Encoder resolution and the Sample Frequency is also a part of the equation we have these formulers for the calculation of the right values:
 
Velocity:
 
RPM = (V_SOLL/16) * Sample Frequency / Encoder resolution ) * 60
 
 
Acceleration:
 
RPM/s = ( A_SOLL/16) * ( Sample Frequency^2 / Encoder Resolution ) * 60
 
 
The standard Sample Frequency for MAC050-141 is always 520,8 Hz ( 1.92 ms ).
For MAC400-4500 it's 769,23 Hz ( 1.3 ms ) or 384,60 Hz ( 2.6 ms ).
But when we use Ethernet it can also be either 1kHz ( 1 ms ) or 500Hz ( 2 ms ).
 
Motor: Incremental encoder Absolute encoder
MAC050-141: 4096 Not possible
MAC800: 8000 8192
MAC400-4500: 8192 8192
 
The Actual Velocity is using another equation:
 
RPM = V_IST * sample Frequency / Encoder resolution * 60
 
For MAC050-141 this means that 100 units = 763 RPM.
But the result of this is also that the accuracy of what you read is +/-8RPM.


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