Pneumatic Connections - ABB TZIDC-200 Operating Instruction

TZIDC-200 DIGITAL POSITIONER | OI/TZIDC-200-EN REV. C

Pneumatic connections

Note
The positioner must only be supplied with instrument air that is
free of oil, water, and dust.
The purity and oil content must meet the requirements of Class
3 according to DIN/ISO 8573-1.
NOTICE
Damage to components!
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.
NOTICE
Damage to components!
Pressure above 6 bar (90 psi) can damage the positioner or
actuator.
Provisions must be made, e.g. by using a pressure reducer, to
make sure that the pressure does not rise above 6 bar (90
psi), even in the event of a fault.
* 5.5 bar (80 psi) (marine version)
Information on double acting actuators with spring-return
mechanism
On double-acting actuators with spring-return mechanism, a
pressure that significantly exceeds the supply air pressure value
can be generated during operation by the springs in the
chamber opposite the springs.
This may damage the positioner or adversely affect control of
the actuator.
In order to ensure that this behavior cannot occur, it is
recommended to install a pressure compensation valve between
the springless chamber and the supply air for these types of
applications. It enables the increased pressure to be transferred
back to the air inlet line.
The opening pressure of the check valve should be < 250 mbar
(< 3.6 psi).
Connection on the device
1 OUT 2
2 OUT 1
Figure 17: Pneumatic connections
Marking Pipe connection
IN Supply air, pressure 1.4 to 6 bar (20 to 90 psi)
Marine version:
• Supply air, pressure 1.4 to 5.5 bar
(20 to 80 psi)
OUT1 Output pressure to the actuator
OUT2 Output pressure to the actuator
(2. Connection with double acting actuator)
** (marine version)
Join the pipe connections according to the designation,
observing the following points:
• All pneumatic piping connections are located on the
right-hand side of the positioner. G¼ or ¼ 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 pipe with dimensions of
12 × 1.75 mm.
• The supply air pressure required to apply the actuating
force must be adjusted in line with the output pressure in
the actuator. The operating range of the positioner is
between 1.4 to 6 bar (20 to 90 psi)
*** 1.4 to 5.5 bar (20 to 80 psi) marine version
3 IN
**
.
***
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