ABB AV2123000 Positioner User Manual

SECTION 8 - REPAIR AND REPLACEMENT
INTRODUCTION
This section provides procedures that detail removal and replacement
of positioner components.
WARNING
Disconnect the supply signal source or remove the equipment
from the process before servicing. Failure to do so
can cause unexpected movement posing a risk of bodily
injury.
REPLACEMENT PROCEDURES
This section contains replacement procedures for:
• Manifold.
• Gain hinge spring.
• Pilot valve assembly.
• I/P converter.
• Cam.
• Diaphragm assembly.
Manifold
Tools Required: • Torque screwdriver.
•
5⁄
32 -inch Allen wrench.
1. Secure (lock) the actuator and remove the supply air.
2. If equipped with an equalizing valve, push in on the valve handle
and move it to the MAN position (Fig. 8-1).
3. Remove the four Allen screws that secure the manifold (Fig.
8-1).
4. Lift the manifold off the positioner.
5. Before replacing the manifold, make sure there are no deposits
on the bosses of the positioner or on the back of the manifold. If there
are, remove the deposits.
6. Replace the O-rings or clean them if they are in good condition
(Fig. 8-2).
7. Clean the O-ring grooves and apply Dow Corning No. 4 or equivalent
lubricant to the O-rings.
INTRODUCTION
8 - 1