Quarter -Turn Electric Valve Actuator【OM Series】 Sun Yeh Ele. Ind. Co., Ltd. | 2021.11
Modulating Controller
The LED indicators (LD4 - LD9) flash.
Please refer to 6.6 (P.25 - P. 26).
The LED indication functions properly but the actuator could operate to fully-open as well as
fully-closed, modulating control was out of function.
The input signal with a reversed polarity, it
means a signal failure.
Verify if the negative pole of signal input
connected to terminal #6 and the positive pole
connected to terminal #7.
Modulating control was out of function.
a. Potentiometer failed and causes actuator
out of control in some section or
abnormal feedback.
b. Input wrong signal type.
c. Modulating board failed and causes
actuator cannot operate or only operate
in a single direction
a. Replace a new potentiometer.
b. Check if the input signal is correct, please
refer to 6.3 (P.19).
c. Replace a new modulating board.
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