Rockwell-automation 1391ES AC Servo Controller User Manual download pdf (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

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.

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 81 82

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Rockwell-automation 1391ES AC Servo Controller User Manual Page 33