38 Electro-pneumatic positioner TZID 42/18-54 EN
5.4 Replacing the pneumatic output unit
The pneumatic output unit can be replaced. The replacement may become necessary for
one of the following reasons:
• Considerable pollution with dirt or oil due to supply with insufficienly cleaned air.
• Change of the output from single-acting to double-acting and vice versa.
• Change of the safe state from “fail safe” to “fail in place” or vice versa.
Proceed as follows:
1. Switch off compressed air supply.
2. Disconnect the plug of the old output unit.
3. Undo the three fasting screws (Torx-head) and remove the old output unit.
4. Insert the new output unit. Make sure that the gasket with its cutting is posi-
tioned correctly.
5. Re-insert the Torx-head screws and torque them to 350 Ncm (31 in-lbs).
6. Connect the plug. Make sure that the plug snaps in properly. The connector is
protected against polarity reversal.
7. Switch on compressed air supply.
!
CAUTION
- Prior to starting any work on the pneumatic output unit, always switch
off compressed air supply.
- When putting the pneumatic output unit back in place, make sure that
all gaskets are present and are positioned properly.
IMPORTANT
A change-over to a pneumatic output unit with other functionality is only
possible with Rev. 5.00 and higher.
Connector
Filter screw
Fastening
screws
Fig. 26 Replacing the pneumatic output unit
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