Flowserve AF-17 Electronic Positioner - Manual (Page 8)

8 AF-17 Electronic Positioner: Installation, Operation and Maintenance WCAIM2031
3.1.2. Tools Needed
1 /
4
" nut driver, 1 /
8
" screwdriver, needle nose pliers, 1 /
16
" Allen wrench (cams and spur gear).
Volt/ohm meter (checking feedback potentiometer resistance, voltages – incoming process signal).
Milliamp source (to check calibration of positioner on actuator).
VAC line cord (to power basic actuator).
3.1.3. Operation Check of Basic Actuator
Set cams for about 1° to 3° of over travel in each direction (full open and full closed). That is, for 0° to 90° operation set
at minus 3° and plus 93°. Power terminals 1 and 3 for CCW rotation, terminals 1 and 4 for CW rotation (reference
paragraph 4.7.6.).
3.2 Mounting Potentiometer
3.2.1 Mounting Single Potentiometer Into Series 75 Actuator
See Figure 2.
A. With the potentiometer mounted to the potentiometer bracket and the spur gear loosely fitted to the potentiometer shaft,
mount the potentiometer bracket (if not already mounted) as follows:
10-23 75 Actuator:
Remove the motor module mounting screws on the side of the module furthest away from the actuator shaft. Position
potentiometer assembly bracket holes over screw holes and line up potentiometer shaft with center of actuator shaft,
replace and tighten screws.
25/3075 Actuator:
Attach potentiometer bracket to motor support plate between the terminal strip and actuator shaft with mounting screws
as shown.
3.2.2 Mounting Dual Potentiometer Into Series 75 Electric Actuator
A dual potentiometer is also available and is required with the AF-17 when external resistance indication is also desired, or
when the 4-20 Position Output option is also used.
Each potentiometer can serve only one function. Remote resistance monitoring and an AF-17, for instance, cannot share a
potentiometer.
Note: Voltage limit of “B” potentiometer is 30 volts maximum.
Mount potentiometer per paragraph A of 3.2.1.
3.2.3 Potentiometer Wiring
A. The feedback potentiometer leads are connected to the terminal block (TB-1) on the AF-17 board. Run the three leads up
through the hole next to potentiometer R29. See Figure 1.
B. Connect the potentiometer leads to the terminal block as follows:
NOTE 1: In the case of a dual potentiometer, “A” (front, close to the bracket) potentiometer wires are wired to the AF-17
board terminal block (TB-1) as stated above, “B” (rear, far from the bracket) potentiometer wires may be wired to terminals 7
(green), 8 (white/black), and 9 (purple) if available and the potentiometer will be used for resistive feedback, or they may be
wired to TB-2 if 4-20 mA position output option is used. The wires are run up through the hole next to Q4 then connected to
TB-2 as follows:
TB-1
Terminal Wire Color
1 Purple
2 White/Black
3 Green
(DO NOT CUT POTENTIOMETER WIRES!)
Flow Control Division
Worcester Controls