Calibration Adjustments - ABB AV1 Operating Instructions Manual

CALIBRATION
Type AV1
Type AV2
OPTIONAL
MANIFOLD
ADJUSTMENT
CALIBRATION
4 - 2
Use the following steps to adjust the zero:
1. Depending on the nomenclature type, apply one of the follow-
ing input signals:
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.
⁄
4-1) with the -inch Allen wrench.
3
32
3. Turn the zero adjustment nut (clockwise moves the actuator
toward minimum span) until the zero radial line on the cam inter-
sects 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
SPAN SPAN
ADJUSTMENT
ASSEMBLY SCREW
Figure 4-1. Calibration Adjustments
CABLE ZERO
CLAMP ADJUSTMENT
SET SCREW
ZERO
ADJUSTMENT
NUT
CONDUIT
HOLE
T00774A