Quarter -Turn Electric Valve Actuator【OM Series】 Sun Yeh Ele. Ind. Co., Ltd. | 2021.11
6.6 Troubleshooting of Modulating Controller
In case LD3 does not light or any of LD4 to LD9 lights when the actuator is motorized,
please refer to steps below for basic troubleshooting.
Please do the troubleshooting when LD4 to LD8 lights, and then restart the power to
turn the lights off.
a. No power supplied.
b. Incorrect connection of the
lines #8, #9 of potentiometer.
c. Modulating controller failed.
a. Check the power supply as well as
wires connected to terminals #4 &
#5, please refer to 6 (P.18)
b. Verify the actuator is wired properly
as per wiring diagram.
c. Send back to factory for inspection.
LD4 goes on
(for 24V units)
The voltage is under 20.4V.
Verify that the input voltage is within
the allowable voltage deviation.
a. An incorrect signal type
inputted. For example, preset
with 2-10 V input but input
4-20 mA.
b. Input a voltage exceeding the
rated. For example, preset
with 2-10 V input but input
13.5V.
c. An incorrect signal type
inputted. For example, preset
with 4 - 20 mA input but
input 2 - 10V. In this case, the
actuator still works in 2 - 7V.
When the signal is over 7.2
V, the LD5 lights.
Verify if the switch 1 is set in
accordance with the type of input
signal. Please refer to 6.3 (P.19 - P.22).
Motor thermal protector started.
a. The duty cycle exceeded the rated,
please refer to 3.5 (P.6).
b. The contact of motor thermal
protector (MOT) disconnected.
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