FSE Series Electric Actuator
Installation & Maintenance Manual
23
November 18, 2022
www.atcontrols.com
Engineering\documents\products\IOM\Iom08026.docx
PCB
LED Status
Possible Problem
Solution
Fault Status
LED4 goes on
a. LS1 and LS2 terminals loose or have
poor contact.
b. Incorrect connection of LS1 or LS2
terminals.
c. Input power failure time is greater than
150ms.
d. Abnormal setting of limit switches and
cams.
e. Power is supplied again during the
spring release.
f. LS1 or LS2 failed.
g. Actuator overload is preventing it from
fully returning to the calibrated spring
release position.
h. Incorrect setting of cam TC2 is
preventing LS2 switch from releasing.
a. Refer to wiring diagram and check
connections. Replace terminal if
necessary.
b. Verify correct wiring.
c. Provide independent power supply to
actuator to avoid unstable supply power.
d. Refer to actuator setup instructions.
e. Remove power until the actuator fully
returns to the spring release position and
then resupply power.
f. Replace with new limit switches.
g. Check sizing is correct. Verify there is no
obstruction preventing actuator from
returning to full spring release position.
Check valve seats are not damaged.
h. Refer to actuator setup instructions.
Power LED1
does not go on
a. Wrong Supply Voltage.
b. Blown fuse.
c. PCB failed.
a. Confirm power supply is according to the
actuator rated voltage.
b. Replace with new fuse.
c. Replace with new PCB.
Operating LED2
does not go on
a. Incorrect setting for LS1 or LS2.
b. PCB failed.
a. Check Fault LED4. If LED4 lights, check
troubleshooting for LED4.
b. Replace with new PCB.
Motor brake
LED3 does not
go on
PCB failed.
Replace with new PCB.
