18 CI/EDP300-EN Rev. A |
D500
5
Pneumatic connection
hange from one to two columns
IMPORTANT (NOTE)
The positioner must only be supplied with
instrument air that is free of oil, water, and dust (in
the gas exhaust with dried natural gas).
The purity and oil content must meet the
requirements of Class 3 according to DIN/ISO
8573-1.
IMPORTANT (NOTE)
On double-acting drives with spring-return
mechanism, a chamber pressure that significantly
exceeds the supply pressure value can be
generated during operation by the springs in the
chamber opposite the springs.
NOTICE – Potential damage to parts
Contamination on the air pipe and positioner can
damage components.
Dust, splinters, and any other particles of dirt must
be blown off the pipe before it is connected.
All pneumatic piping connections are located on the right-
hand side of the positioner. G1/4 or 1/4 18 NPT tap holes are
provided for the pneumatic connections. The positioner is
labeled according to the tap holes available.
We recommend that you use a line with dimensions of 12 x
1.75 mm. The level of supply air pressure required to apply the
actuating force must be adjusted in line with the output
pressure in the actuator.
The working range for the positioner is between 1.4 ... 10 bar
(20 ... 145 psi).
Connect the connections according to their labeling:
Designation
Pipe connection
SUP / ZUL IN
Air supply, pressure 1.4 ... 10 bar
(20 ... 145 psi)
Y1 / OUT1
Actuating pressure for actuator
Y2 / OUT2
Actuating pressure for actuator (2nd connection
with double-acting actuator)
NOTICE – Potential damage to parts
Pressure above 10 bar (145 psi) can damage the
positioner or actuator.
Provisions must be made (e.g., use of a pressure
regulator) to ensure that the pressure does not
rise above 10 bar (145 psi), even in the event of a
fault.
IMPORTANT (NOTE)
On double-acting drives with spring-return
mechanism, a stop valve must be fitted in the
supply line. Otherwise, the Auto Adjust function is
aborted and the valve cannot be regulated.
Fig. 19: Pneumatic connections
1 Pneumatic outputs | 2 Supply air |
3 Filter screw (on underside of housing)
