Sun Yeh Electrical OM Series - Page 25

Quarter -Turn Electric Valve Actuator【OM Series】 Sun Yeh Ele. Ind. Co., Ltd. | 2021.11
23
OM-1, OM-A & OM-AM
 VR1, VR51, VR2 and VR52 are used to adjust signal input as well as output.
Variable
Resistor
Signal type to be adjusted
Position to be adjusted
VR1
To adjust 10 V, 20 mA input signal
Fully-Open
VR51
To adjust 10 V, 20 mA output signal
Fully-Open
VR2
To adjust 2 V, 4 mA input signal
Fully-Closed
VR52
To adjust 2 V, 4 mA output signal
Fully-Closed
If VR51 and VR52 are adjusted, VR1 and VR2 must be adjusted accordingly.
 Signal setting for Fully-OPEN position
Rotate VR1 counter-clockwise until a light click is heard, then apply 10V or 20mA to
the modulating board. After that, slightly rotate VR1 clockwise until the LD2 goes on
and then adjust VR51 to complete the setting. When adjusting VR51, if the LD2 is
off, keep rotating VR1 clockwise until the LD2 goes on.
 Signal setting for Fully-CLOSED position
Rotate VR2 clockwise until a light click is heard, then apply 2 V or 4 mA to the
modulating board. After that, slightly rotate VR2 counter-clockwise until the LD1
goes on and then adjust VR52 to complete the setting. When adjusting VR52, if the
LD1 is off, keep rotating VR2 counter-clockwise until the LD1 goes on.
VR52
VR51
VR1
VR2
VR51
Clockwise: decreasing signal value.
Counter-clockwise: increasing signal value.
VR52
Clockwise: decreasing signal value.
Counter-clockwise: increasing signal value.
LD2
LD1
7
1
2
4
5
6
11
12