Rockwell Automation 20P PowerFlex Digital DC Drive - Manual (Page 263)

Rockwell Automation Publication 20P-UM001I-EN-P - February 2013 263
Application Notes Appendix C
Analog Input Signal Comparison
This feature provides an indication via the HIM or a digital output when the
signal of analog input 1 has reached a limit above or below a set reference point.
Calculations used to determine Pars1042 [Anlg In1 Cmp] and 1043 [Anlg In1
Cmp Err]:
• [Anlg In1 Cmp] = (comparison value) x 10000 / (max. reference value)
• [Anlg In1 Cmp Err] = (tolerance value) x 10000 / (max. reference value)
Example 1:
An application requires an indication via a digital output that the motor speed is
within 100 rpms of 700 rpm.
• Par 45 [Max Ref Speed] = 1500 rpm (maximum reference value)
• For Analog Input 1, 10V or 20mA sets the maximum value of Par 44
[Speed Ref A] = Par 45 [Max Ref Speed]
Configure the following:
• Set Par 70 [Anlg In1 Sel] = “Speed Ref A”
• Set [Digital Outx Sel] = “Input1 Cmp” (Par 1045 [Anlg In1 Cmp Eq])
• Set Par 1042 [Anlg In1 Cmp] = 4667 (700 x 10000 / 1500)
• Set Par 1043 [Anlg In1 Cmp Err] = 666 (100 x 10000 / 1500 )
Anlg In1 Cmp
0
0 ms
Anlg In1 Cmp Eq
Anlg In1 Cmp Dly
Anlg In1 Cmp Err
0