Flowserve AF-17 Electronic Positioner - Manual (Page 25)

WCAIM2031 AF-17 Electronic Positioner: Installation, Operation and Maintenance 25
8.3 Use the following troubleshooting guidelines to isolate problems/bad components
Prior to beginning any procedure, read all of Check, Action, and Notes and Cautions sections.
Flow Control Division
Worcester Controls
Check Action Notes and Cautions
8.3.1 Check for proper AC/DC power Correct as necessary.
to actuator and circuit board.
See Figures 5 or 6 for AC or
Figure 3 in DCAF17 IOM
supplement for DC.
8.3.2 With power off, check for broken Repair broken wires and
wires and/or loose connections. tighten loose connections.
8.3.3 With power off, check to see Remove F1 from socket pins Before restoring power, try to
if fuse F1 is blown. or fuse clips. For AC boards determine what caused F1 to blow
only, check for continuity and correct problem. See part 3.6
through fuse with an ohmmeter. and paragraph 4.7.5 Notes and
If F1 is bad, replace it. AC Paragraph A of Part 1.1 for AC
boards have a spare fuse (F2) boards. See part 2.2 in DCAF17
located on board. IOM supplement for DC boards.
8.3.4 Check operation of basic See Part 8.1. This check will isolate the problem
actuator per Part 8.1. to either the actuator or the circuit
board.
8.3.5 Check for proper range Use ammeter, voltmeter or See models listed at beginning of
of input signal. ohmmeter to verify input IOM for ranges. 4-20 mA is
signal range. standard.
8.3.6 With power off, check calibration A quick check to see if this is the When trying to move the valve
of feedback potentiometer per problem is to declutch the actuator manually with the clutch
Paragraph 3.2.4. shaft and reposition the shaft to disengaged, be certain that the
about 45° (if valve torque permits). wrench fits properly on the flats of
If the actuator now runs normally the actuator shaft. Improper fit can
in each direction (after clutch cause shaft damage with
re-engages), recalibrate the consequent damage to cover
feedback potentiometer. bearing surface. Stay within the
preset quadrant of operation. See
Paragraph C of Part 1.1.
8.3.7 Check to see that varying input If LEDs do not turn on and off, The turning on and off of the LEDs
signal from 4-20 mA causes the replace board. is indicative that the input side of
light emitting diodes (LEDs) to the circuit board is OK.
turn on and off individually.
8.3.8 Check the operation of the If intermittent or jittery operation Turning the A-H control CCW may
positioner with a portable, stops, it is indicative of a noisy help to alleviate the problem.
battery-operated signal source. on-line signal input. To avoid
damaging the actuator, it is
necessary to "clean up" the signal.
Also, follow the shielding guidelines
of Paragraphs 1.2 and 1.2.4.
8.3.9 Check the motor run capacitor Replace as necessary. Disconnect all leads from capacitor
for a short, excessively high leakage (power off) prior to testing. Do not
and low capacitance. Use a exceed rated voltage of capacitor.
capacitance meter to check. Make certain that capacitor is
(AC boards only) terminals discharged before reconnecting.