Yokogawa YVP110 - Manual (Page 29)

<3. Installing YVP110 on Actuator>
3-5
IM 21B04C01-01E
Feedback shaft
Feedback lever
Rotation axis
of valve plug
Pin
Applicable pin O.D.: 6 mm
F0309.ai
Lock screw
Stopper
Figure 3.9 Inserting Pin into Hole of Feedback
Lever (In case of using F9176HA)
3.2.3 A/M Switching
To perform manual operation of the valve using
the A/M (automatic/manual) mode switching
mechanism of the YVP110, there needs to be a
pressure regulator for the air supply. To perform
manual operation, follow the procedure below.
(1) Turn the A/M selector switch clockwise to
change the switch position to M until it stops.
(2) In manual mode, the pneumatic pressure
output to the valve actuator can be varied by
changing the regulator output pressure by more
than 70 kPa (approximately), regardless of
the input signal of the YVP110. For a YVP110
equipped with pressure gauges, you can read
the output pressure to the actuator.
When using the Double Acting Type, the
pneumatic pressure can only be varied from
OUT1 to the valve actuator. The pressure is
always 0% from OUT2 to the valve actuator.
Note that the valve position is not always in
accord with the regulator pressure.
(3) After you have finished manual operation,
turn the A/M selector switch counterclockwise
until the stopper pin touches the side of the
YVP110’s casing in order to ensure the switch
position changes to A.
WARNING
• Prior to changing the A/M selector switch
position, make sure that doing so will neither
cause an injury nor affect the process.
• Changing the A/M selector switch position
from M (manual) to A (automatic) or
A(automatic) to M(manual) during operation
will cause the valve stem to temporarily
move to a position different from the position
determined by the level of the input signal to
the positioner.
• If the pressure larger than the allowable
range of pressure gauge is applied, the
pressure gauge may possibly be damaged.
A/M selector switch
Stopper pin
Supply pressure gauge
(optional)
Output pressure gauge
(optional)
F0310.ai
Figure 3.10 A/M Selector Switch