Rockwell Automation 1391ES AC Servo Controller - Manual (Page 33)

Inputs, Outputs and Adjustments
Chapter 5
5-31
Potentiometer Adjustments Preliminary adjustment of the Logic Control Board potentiometers is
required as explained below. Descriptions of the potentiometers follow.
Initially the potentiometers shall be set as shown in Table 5.A. See
Figure 5.2 for potentiometer locations.
Table 5.A
Initial Potentiometer Settings
Potentiometer
Current Limit (R148)
Velocity Gain (R144)
Offset (R1) and Scale
(R132)
Setting
10
4
Leave at the present setting until adjustment
becomes necessary in the Start-Up Procedure.
Current Limit (R148)
This single turn potentiometer adjusts the maximum current available to
the servomotor when TB2-5 is grounded. The maximum setting is 300% of
the motor rating or twice the continuous rating of the controller, whichever
is lower. The pot can be calibrated (fine tuned) using TP21 and the
proportion: 3V DC=100% continuous motor current.
Velocity Gain (R144)
This potentiometer is used to fine tune the response characteristics of the
system. Clockwise rotation increases the dynamic gain of the servo
amplifier, while counterclockwise rotation decreases gain. When used in
conjunction with the integral gain switch, the system response can be
adjusted over a wide range.
Offset (R1)
Adjustment for the system offset voltages is provided by this multi-turn
pot.
Velocity Command Scale (R132)
This adjustment is a multi-turn pot that scales the command signal with the
velocity feedback signal.