Servo Adjustments (Av4) - ABB AV3 Instruction Manual

M A XIM U M /M IN IM U M
LO C KN U TS
S ID E V IEW
C A M
H U B SC R E W
Figure 4-9. Servo Adjustments (AV4)
6. Adjust the internal signal pressure to the maximum value 107
to 110 kPa (15.5 to 16.0 psig). Do so by closing the raise contact
until the pressure stops increasing.
a. If 107 to 110 kPa (15.5 to 16.0 psig) pressure is obtained,
calibration is complete.
b. If 107 to 110 kPa (15.5 to 16.0 psig) pressure is not
obtained, proceed to Step 7.
7. Loosen and back off the maximum stop screw locknut. With
the raise contact closed, rotate the maximum stop screw (clock-
wise to decrease) until the pressure is between 107 to 110 kPa
(15.5 and 16.0 psig). Verify that the hub screw is in contact with
the tip of the maximum stop screw (Fig. 4-9). Tighten the maxi-
mum locknut and check the pressure.
8. If unable to obtain the correct pressures in Steps 5 or 7, close
the contact for the problem direction, loosen the zero locknut
screw. With the appropriate stop screw positioned at mid-stroke,
rotate the servo zero screw (Fig. 4-9) to give the desired pressure.
Tighten the zero lockscrew. Repeat Steps 4 through 7.
TROUBLESHOOTING CALIBRATION ADJUSTMENTS
CALIBRATION
Z ER O LO C KN U T
SE RVO ZE RO
SC R EW
M IN IM U M S TO P
SC R E W
M A XIM U M S TO P
SC R E W
FR O N T V IE W
T 02 0 01 A
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