Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 223)

Servo Parameters
Chapter 7
7-77
Function
Analog Systems
This parameter is used to specify the servo motors nominal rated current
for continuous duty. This parameter is entered as a percentage of the
parameter Analog Servo Pos. Voltage or Analog Servo Neg Voltage
(whichever is smaller). Calculate what servo card voltage will yield an
amplifier output equal to your motors rated continuous duty current as
follows:
(Continuous duty rated motor current
(Amplifier output current , A/V)
= (servo card voltage for continuous duty)
Use the servo card voltage calculated above and determine what
percentage it is of the servo card’s maximum voltage as set with the
parameter Analog Servo Pos. Voltage or Analog Servo Neg Voltage
(whichever is smaller).
(Servo Card Voltage for Continuous Duty) x 100 = (Value of Peak Current as a % of RMS)
(Servo Card Voltage for Max Current)
8520 Digital Systems
Your Allen-Bradley 8520 digital amplifier has jumper settings used to
configure the drives peak current as a % of RMS. This AMP parameter is
used to tell the control how the amplifier is configured. You must set this
parameter to match your amplifier jumper setting in order for the control to
properly perform torque calculations. Refer to your 9/Series integration
and maintenance manual for details on the location and settings of this
jumper on your 8520 digital drive.
Important: We recommend that the default value of 200% be used for
9/230 8520 Digital CNCs.
1394 Drives
Your Allen-Bradley 1394 digital amplifier requires this parameter be set at
300%. Your system may never reach this 300% peak current as it is
ultimately limited by your selection of 1394 axis module(s) and 1326
motor(s). This includes 9/230 Digitals that use the 1394 drive.
7.3.10
Peak Current as a % of RMS