Yokogawa YVP110 - Manual (Page 30)

<4. Wiring and Piping>
4-1
IM 21B04C01-01E
4. Wiring and Piping
4.1 General
This chapter describes the air piping and electric
wiring connections.
WARNING
• Be sure to cut off all inputs to the valve
actuator and other accessories of the valve
and actuator, including the air supply and
electric signal before making or modifying
the piping and wiring connections.
• The process must be shut down or the
control valve isolated from the process
by using bypass valves or the like when
making or modifying the piping and wiring
connections.
• Always cap the unused wiring ports with
blind plugs.
4.2 Piping
4.2.1 Air Supply
For stable operation of the YVP110 over a long
term, a clean and dry supply of air needs to be
maintained. Therefore, be careful about the
following:
(1) To prevent moisture, oil, and dust from being
led into the YVP110 through pipes, give careful
consideration to the choice of the air supply
system and supply air suction point as well
as installation of the air supply header and air
supply piping.
(2) The desired supply air must:
• Be dry air whose dew point is at least 10°C
lower than that of the ambient temperature.
• Be free from solid particles as a result of
being passed through a 5-µm or finer filter.
• Not contain oil at a concentration higher than
1 ppm in weight or volume.
• Not be contaminated by a corrosive,
explosive, flammable, or toxic gas.
• Comply with ANSI/ISA-57.3 1975 (R1981) or
ISA-S7.3-1975 (R1981).
(3) The YVP110 requires an air supply of 140 to
400 kPa. Within this range, regulate the air
supply pressure at a level within ±10% of the air
supply pressure specified for the actuator, and
at 10% of the actuator’s spring range or higher.
WARNING
Do not supply air at a pressure exceeding
the maximum rated air supply pressure of
the actuator or the YVP110 (400 kPa). Doing
so may result in a high risk of damage to the
equipment or lead to an accident.
Supplying air to the valve actuator may cause
the valve stem to move. Exercise extreme
caution with regard to safety.
4.2.2 Pneumatic Piping
Connect the air supply pipe to the SUP port of the
YVP110, and the output pressure pipe to the OUT1
port. When using the Double Acting Type, connect
the output pressure pipe to the OUT2 port of the
YVP110. A power failure will result in the fail-safe
action; OUT1=0% and OUT2=100%. Use O.D.
6-mm/I.D. 4-mm or O.D. 8-mm/I.D. 6-mm copper
tubes for piping, and pneumatic pipe fittings for
joints. After finishing the piping, check that there is
no leakage from the joints.
Note that a YVP110 has two air supply ports (SUP):
one at the rear and the other on the side. When
delivered, the rear SUP port is capped with a blind
plug. Thus, to use the rear SUP port, remove the
blind plug and cap the side SUP port with it. At this
time, be very careful that no foreign matter or dust
caught in the sealing tape is allowed to enter inside
the pipe.
Figure 4.1 shows the pneumatic piping ports. The
port specification can be chosen when ordering the
YVP110.