Flowserve AF-17 Electronic Positioner - Manual (Page 23)

8.0 TROUBLESHOOTING
8.1 General
The following charts are a troubleshooting guide for servicing the positioner, should a malfunction occur. If the problem cannot be
solved, the unit should be returned to the factory for service.
The first thing to be checked, before proceeding to the troubleshooting guide, is to determine if the malfunction is in the
positioner, or in the actuator. To do this, remove the red and black positioner leads from terminals 3 and 4 of the actuator, and the
AC line connections from terminals 1 and 2. Tape these leads. Using a test cable, apply power to actuator terminals 1 and 3. The
actuator should rotate CCW until stopped by the CCW limit switch. Then apply power to terminals 1 and 4 to check CW actuation
and the CW limit switch.
For AF-17-240 VAC positioner only, switches do not directly limit travel. Exercise caution not to override limit switches. Operate
the unit to its limits in each direction, to assure that the basic actuator is functional.
If the actuator does not operate, check wiring from the terminal strip, through the limit switches to the motor and capacitor. For
240 VAC actuator with AF-17 positioner, check wiring from the terminal strip to the capacitor and to the motor. Check switch
continuity. Check for an open motor winding, and check for a shorted capacitor. If the problem in the actuator still cannot be
determined, return the unit for service. If the actuator functions properly, then proceed to the troubleshooting guide.
To facilitate troubleshooting a positioner, it would be advantageous on resistive input units to connect a potentiometer directly to
the signal input terminals in place of the standard process input. Use a 150 ohm or 1000 ohm potentiometer depending on which
model is used. Figure 11 on next page shows a schematic of a simple test unit that can be connected to the input terminals to
stimulate the process signal for a milliamp rating.
Figure 10
WCAIM2031 AF-17 Electronic Positioner: Installation, Operation and Maintenance 23
Flow Control Division
Worcester Controls