Type Av3 Positioner Emi/Electronics Housing - ABB AV3 Instruction Manual

T R A N S D U C E R
PN EU M AT IC IN P U T
Figure 4-8. Type AV3 Positioner EMI/Electronics Housing
7. Adjust the servo gain as follows:
a. Apply 20 mA and observe the pressure at port I. Increase
the gain by adjusting the GAIN potentiometer (clockwise), until
oscillation occurs (Fig. 4-8).
b. Decrease the gain by adjusting the GAIN potentiometer
(counterclockwise) until oscillation stops (Fig. 4-8). Then
decrease gain another half turn.
NOTE: If, during operation any oscillation or overshoot of the
servo assembly occurs, the gain may be decreased further.
c. After adjusting the gain, Return to Step 5.
NOTE: This gain adjustment applies only to the servo assembly.
It is not used to adjust the gain of the overall positioner. Refer to
Gain Adjustment for information detailing overall positioner
gain.
TROUBLESHOOTING CALIBRATION ADJUSTMENTS
CALIBRATION
EM I/EL E C T R O N IC S
H O U S IN G
SE RVO M OTO R W IR E
C O N N EC TIO N
T 00 3 18 A
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