Changing The Positioner Action; Changing The Range Spring; Changing The Input Signal Range On 3660 Positioners; Removing The Positioner From The Actuator - Fisher 3660 Instruction Manual

Instruction Manual
D101402X012
D Vent the power actuator loading pressure and relieve any actuator spring precompression.
D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
D For 3661 positioners in intrinsically safe areas, current monitoring during operation must be with an approved meter
for hazardous areas in order to avoid personal injury or property damage caused by an explosion or fire.
D Check with your process or safety engineer for any additional measures that must be taken to prevent against process
media.

Changing the Positioner Action

This section explains changing the positioner action from direct to reverse or reverse to direct. With direct action, the
positioner output pressure increases as the instrument input signal to the positioner increases. With reverse action,
the positioner output pressure decreases as the input signal to the positioner increases. To change the action of a
positioner that is already mounted on an actuator, remove the positioner from the actuator. Refer to the Removing
the Positioner from Actuator section. Refer to figure 24 or 25 for key number locations.
1. Unscrew the two captive cover screws and remove the cover (key 21). Carefully lift the flapper spring at the location
shown by key 10.
2. Slide out the flapper (key 9) and rotate it so that the desired letter (D or R for direct and reverse) is nearest the
adjusting screw (key 18). When inserting the flapper, be sure the end of the flapper engages the groove in the end
of the screw and that the flapper spring (key 10) sets into the V‐notches of the flapper.
3. Mount the positioner to the opposite actuator leg as explained in the Positioner Mounting section and shown in
figure 2.
4. Refer to the Calibration section of this manual for the calibration procedure.

Changing the Range Spring

Refer to figure 24 or 25 for key number locations.
1. Unscrew the two captive cover screws and remove the cover (key 21). Loosen the retaining screw (key 19P) and pull
the feedback lever assembly (key 19) out slightly to release the range spring (key 30) tension.
2. Remove and replace the range spring (key 30).
3. Push the feedback lever assembly (key 19) back into position and retighten the retaining screw (key 19P).
4. Refer to the Calibration section for the calibration procedure.

Changing the Input Signal Range on 3660 Positioners

To change the input signal range from 0.2 to 1.0 bar (3 to 15 psig) to 0.4 to 2.0 bar (6 to 30 psig) or vice versa, change
the input diaphragm assembly (key 28, figure 24) by performing the Changing the Input Module Diaphragm Assembly
procedure in this Maintenance section.

Removing the Positioner from the Actuator

Center‐Bolt Mounting on 1250, 1250R, 3024S, and Baumann Actuators
Refer to figure 24 or 25 for key number locations unless otherwise indicated.
WARNING
To avoid personal injury caused by electrical shock, disconnect electrical power to 3661 positioners.
3660 and 3661 Positioners
September 2015
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