Rockwell Automation 1391 USER MNL/DIGITAL AC SERVO DR - Manual (Page 58)

Chapter 6
Programming
6-21
Parameter 201 – Friction Bit (Frictn Bit)
The number of bits surrounding Friction Hysteresis (parameter 200).
Parameter Type: View/modify in Maintenance level
Minimum Value: 0
Maximum Value: 50
Default Value: 10
Parameter 210 – Analog to Digital Converter Offset (Anlg Vel Offst)
This parameter adds an offset to the A/D converter value to correct for
input A/D offset and user input command D/A output offset.
Parameter Type: View/modify in Modify level and Maintenance level
Minimum Value: –61 mV
Maximum Value: +61 mV
Default Value: 0 mV
Parameter 211 – Analog Velocity Gain (Anlg Vel Gain)
This parameter determines how the A/D converter value is scaled. It is set
to the number of motor rpm that is to represent 1 volt of input command.
The desired input velocity command voltage to motor rpm scaling is
accomplished with the Analog Velocity Gain parameter (211). The default
setting is 500 rpm/volt. Use the following formula if the maximum motor
speed (rpm) and maximum velocity command (volts) are known.
Maximum Desired Motor RPM
Maximum Velocity Command
RPM
Volts
=
for example:
3000 RPM Maximum
8V DC Maximum Command
375 RPM
Volts
=
Parameter Type: View/modify in Modify level and Maintenance level
Minimum Value: –790 rpm per volt
Maximum Value: +790 rpm per volt
Default Value: +500 rpm per volt
Parameter 212 – Digital to Analog #1 Gain (D/A 1 Gain)
This parameter scales the D/A #1 Command Value (parameter 58) before it
is output to D/A Converter 1.
To change output voltage scaling: Desired Voltage per 1000 rpm x 0.05553.
Parameter Type: View/modify in Modify level and Maintenance level
Minimum Value: gain of –14.6
Maximum Value: gain of +14.6
Default Value: gain of +0.067