
FSE Series Electric Actuator
Installation & Maintenance Manual
24
November 18, 2022
www.atcontrols.com
Engineering\documents\products\IOM\Iom08026.docx
Modulating Controller
General
Issue
Possible Problem
Solution
LED indicators
(LD5-LD9) flash.
Refer to PCB troubleshooting for
Modulating controller below.
Not controlling to
position correctly.
a. Potentiometer failure causing actuator to
not control to setpoint position or is
providing abnormal feedback.
b. Wrong input signal type.
c. Modulating board failed and causing
actuator to not operate, or only operating
in single direction.
a. Replace with new potentiometer
b. Check DIP switch setting matches input
signal type.
c. Replace with new modulating board.