Pilot Valve Measurement For Maximum Speed - ABB AV1 Operating Instructions Manual

REPAIR AND REPLACEMENT
PILOT VALVE STROKE ADJUSTMENT
8 - 8
b. If manual override is not available, disconnect (and
secure) the linkage. Plug ports 01 and 02 if necessary.
2. Apply the supply pressure.
3. Apply the maximum input signal to the positioner:
AV11: 103.4 kPa (15.0 psig).
•
AV12:186.2 kPa (27.0 psig).
•
AV23: 20 mA.
•
⁄
4. Use the long -inch Allen wrench, adjust the top adjustment
3
32
screw (Fig. 8-4) appropriately until the measurement matches the
value shown in Figure 8-3. Figure
surement is taken.
5. Apply the minimum input span to the positioner:
AV11: 20.7 kPa (3.0 psig).
•
AV12: 20.7 kPa (3.0 psig).
•
AV23: 4 mA.
•
⁄
6. Use the long -inch Allen wrench to adjust the lower stroke
3
32
adjustment screw (Fig. 8-4). Adjust the screw until the measurement
matches the value shown in Figure 8-3.
STEM IS
FLUSH
WITH BODY
STEM POSITION AT
BALANCE CONDITION
Figure 8-3. Pilot Valve Measurement for Maximum Speed
8-3 also shows the way the mea-
0.030
0.030
STEM POSITION TOP STEM POSITION LOWER
ADJUSTMENT SCREW ADJUSTMENT SCREW
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