ABB AV2123000 Positioner User Manual

CALIBRATION
Use the following steps to adjust the zero:
1. Depending on the nomenclature type, apply one of the following
input signals:
Type AV1
Type AV2
20.7 kPa (3.0 psig) input signal pressure. The actuator should
move to its fully closed position.
4.0 mA input signal. The actuator should move to its fully closed
position.
2. To adjust the zero, loosen the zero adjustment set screw (Fig.
3
4-1) with the ⁄ 32 -inch Allen wrench.
3. Turn the zero adjustment nut (clockwise moves the actuator
toward minimum span) until the zero radial line on the cam intersects
with the center of the cam roller (Fig. 4-2).
NOTE: This adjustment may be biased; i.e., turning the zero
adjustment nut slightly clockwise to make sure a valve or
damper is firmly seated at the minimum input signal.
4. Tighten the zero adjustment set screw.
PILOT VALVE
OPTIONAL
MANIFOLD
ZERO
ADJUSTMENT
NUT
CONDUIT
HOLE
SPAN
ADJUSTMENT
ASSEMBLY
SPAN
ADJUSTMENT
SCREW
CABLE
CLAMP
ZERO
ADJUSTMENT
SET SCREW
T00774A
Figure 4-1. Calibration Adjustments
CALIBRATION
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