Fisher 3660 Instruction Manual page 24

3660 and 3661 Positioners
September 2015
Figure 19. Adjustment Locations (Equivalents of Pressures Shown in This Drawing are:
6 bar = 86 psig, 4 bar = 58 psig, and 1.4 bar = 20 psig)
R=REVERSE
UMGEKEHRT
INVERSE
28B0006‐B
8. Release all pressure from the positioner. Remove the plug or the gauge that was installed in step 4, and reconnect
the output tubing to the actuator.
9. Turn on supply pressure. Set the input signal to the minimum value.
10. Remove the cover (key 19T) from the feedback lever assembly (key 19).
11. Set the travel (span) adjustment to the desired actuator travel by loosening the hex nut (key 19D) and sliding the
pilot shaft (key 19A) to the desired setting on the feedback lever assembly (key 19). The travel settings are marked
in millimeters on the feedback lever assembly.
12. Set the gain (PB) adjustment and/or the output volume damping adjustment to a setting that provides the best
actuator/positioner response. Observe the gain dependency on the air supply pressure as shown in the graph of
figure 19. The gain adjustment restrictor for air delivery should be fully open for large size actuators and adjusted to
a mid‐value for smaller size actuators with 225 cm
gain adjustment at approximately one turn open, and, if the output volume damping adjustment is used, turn it
clockwise to decrease the air delivery.
13. Adjust the valve stem position by rotating the zero adjustment screw (key 19S).
14. Set the input signal to the maximum value.
24
REFER TO INSTRUCTION MANUAL FOR
POSITIONER ADJUSTMENT PROCEDURES
ZERO
NULL PUNKT
D=DIRECT
NORMAL
DAMPING=H
D'A'MPFUNG
AMORTISSEMENT
OUTIL DE REGLAGE
TRAVEL
INCREASE
HUB
TRAVEL
COURSE
SUPPLY
ALIM.
ZUL.
TURNS
UMDREHUNGEN
TOUR
GAIN
VERST'A'RKUNG
2
(35 square inches) or less diaphragm area. Start by setting the
Instruction Manual
CALIBRATION
TOOL
CALIBRATION
WERKZEUG
D101402X012