Stroke Adjustment Screw Locations; Pilot Valve Measurement For Maximum Speed - ABB AV3 Instruction Manual

REPAIR/REPLACEMENT PROCEDURES
PILOT VALVE STROKE ADJUSTMENT
8 - 10
⁄
4. Using the -inch Allen wrench, adjust the top adjustment screw
3
32
(Fig. 8-5) appropriately until the measurement matches the value
shown in Figure 8-6. Figure
is taken.
TO P AD J U S TM EN T S C R E W
AL LE N W R EN C H
AC C E S S
Figure 8-5. Stroke Adjustment Screw Locations
ST E M IS
F LU S H
W ITH BO DY
ST E M P O S IT IO N AT
B A LA N C E C O N D IT IO N
Figure 8-6. Pilot Valve Measurement for Maximum Speed
5. Apply the minimum input span to the positioner (4 mA for Type
AV3 positioner or a voltage pulse to the lower terminal for Type AV4
positioner).
6. Use the long (at least 5 inch)
lower stroke adjustment screw (Fig. 8-5). Adjust the screw until the
measurement matches the value shown in Figure 8-6.
8-6 also shows the way the measurement
SIG N A L
D IA PH R AG M
H IN G E S PR IN G
LO W ER A D JU S T M EN T
S C R EW
R A N G E SP R IN G
0 .0 3 0
0 .0 3 0
ST E M P O S IT IO N TO P ST E M P O S IT IO N LO W E R
AD JU S TM E N T S C R EW AD JU S TM E N T S C R EW
⁄
-inch Allen wrench to adjust the
3 32
T 00 77 8 A
T 00 7 77 A