Emerson Q Series Guida all'installazione
2
1
Q-Series
Switch Adjustment and Feedback Mechanism replacement
Repair Instruction Manual
DOC.SAFM.Q4.E Rev. 0
March 2018
Repair Instruction Manual
DOC.SAFM.Q4.E Rev. 0
Table of Contents
March 2018
3Table of Contents
Contents
1 Before you start ....................................................................................................4
Scope...................................................................................................................................................... 4
General safety messages ......................................................................................................................... 4
Required tools......................................................................................................................................... 5
2 Disassembly procedure.........................................................................................6
3 Reassembly procedure..........................................................................................9
4 Adjusting the switch points.................................................................................11
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March 2018
Repair Instruction Manual
DOC.SAFM.Q4.E Rev. 0
1 Before you start
1.1 Scope
This repair manual is intended to give instructions to replace the switch adjustment screws and/or the
feedback mechanism of the Q-Seires Control modules.
1. Repair of the switch adjustment screws may be neccesary in case too much force was applied on the screw
heads and the screw heads were damaged as such.
2. Repair of the feedback mechanism may be neccesary in case too much force was applied on the threads of
the mechanism and threads were damaged as such.
Figure 1 Scope of the manual
2
1
1.2 General safety messages
WARNING
Avoid personal injury or property damage from sudden release of process pressure or bursting of parts.
Before performing any maintenance procedures on the QC range of Control Modules:
- Always wear protective clothing, gloves, and eye wear when performing any maintenance procedures to
avoid personal injury or property damage.
- Do not remove the actuator from the valve while the valve is still pressurized.
- Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator.
Be sure the actuator cannot suddenly open or close the valve.
- Use bypass valves or completely shut off the process to isolate the control valve from process pressure.
Relieve process pressure from both sides of the valve.
- Use lock-out procedures to be sure that the above measures stay in effect while you work on the equipment.
- Check with your process or safety engineer for any additional measures that must be taken to protect
against process media.
- Vent the pneumatic actuator loading pressure and relieve any actuator spring pre-compression so the
actuator is not applying force to the valve stem; this will allow for the safe removal of the stem connector.
- Donotremoveorreplacewhilecircuitislivewhenaammableorcombustibleatmosphereispresent.
- Substitution of electronics cartridge, switch cartridge, pilot valve cartridge, pneumatic cartridge, enclosure
and seals must be with parts from Emerson else the suitability for Division 1 or 2 will be impaired. Always use
proper component replacement techniques, as presented in this manual. Improper techniques or component
selectionmayinvalidatetheapprovalsandtheproductspecications,asindicatedinapplicableControl
module Installation Guides and may also impair operations and the intended function of the device.
!
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Repair Instruction Manual
DOC.SAFM.Q4.E Rev. 0
March 2018
IMPORTANT
When replacing any of the components of the Control Module, the maintenance should be performed in an
instrument shop whenever possible. Make sure that the electrical wiring and pneumatic tubing is
disconnected prior to disassembling the instrument.
1.3 Required tools
In order to replace the switch adjustment screws and/or feedback mechanism below tool are required.
Figure 2 Required tools
Plastic mallet
Punch drive
Set of metric
allen keys
Slot screw
driver or
equivalent
E-clips tool
for size
2.5mm
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March 2018
Repair Instruction Manual
DOC.SAFM.Q4.E Rev. 0
2 Disassembly procedure
IMPORTANT
Inordertoreplacetheadjustmentscrews,rstthefeedbackmechanismneedstobedisassembled.
1. Remove the cover screws on the back side of the control module. Check if the O-ring seals are in good shape.
Replace if neccesary.
Figure 3 Remove the cover screws
3 mm Allen keyPay attention to the
two bound seal washers
2. Remove the cover and guide bushing. Check if the O-ring seals are in good shape. Replace if neccesary.
Figure 4 Remove cover and guide bushing
Pay attention
to the
two bound
seal washers
Guide
bushing
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Repair Instruction Manual
DOC.SAFM.Q4.E Rev. 0
March 2018
WARNING - WEAR SAFETY GLASSES
Watch out for the spring when release the screw driver after remove the e-clip.
3. Remove the E-clips from groove using the slot screw driver.
Figure 5 Remove E-Clips
4. Take out the feed back mechanism. The plastic adjustment screws are under the feed back mechanism.
Figure 6 Remove feedback mechanism
Adjustment
screws
!
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March 2018
Repair Instruction Manual
DOC.SAFM.Q4.E Rev. 0
5. Punch the plastic screws from bottom untill they are free to be removed from the top.
Figure 7 Remove the adjustment screws
Adjustment
screws
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Repair Instruction Manual
DOC.SAFM.Q4.E Rev. 0
March 2018
3 Reassembly procedure
IMPORTANT
Check before replacing that both plastic adjustment screws have two O-rings in the top and bottom groove.
1. Mountthenewadjustmentscrewsandpressthemdownuntiltheyareushwiththebody.
Figure 8 Mount the new adjustment screws
O-ring seals
2. Adjust the orientation of the heads of setting screws of the feedback mechanism to match the direction of
new adjustment screws.
Figure 9 Adjust the orientation of the heads of setting screws
Heads of setting screws
of the feedback
mechanism
3. Place the feedback mechanism back into housing. The mechanism can be pressed down to the same level
of the machined surface if the rotation of the screw and plastic are matched in step 2.
4. Place the spring back and put the washer on, make sure the direction of washer is correct so that the E-clip
can sit in.
Figure 10 Place the feedback mechanism back
Press down to the same levelPlace the spring back and put the
washer on top
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March 2018
Repair Instruction Manual
DOC.SAFM.Q4.E Rev. 0
WARNING - WEAR SAFETY GLASSES
Wear safety glasses when compressing the spring.
Releaseyourngersslowlyaftermountingthee-clip.
Try a different angle if you fail to compress the spring and washer.
5. Press the spring with spring washer down untill the groove and the switch operating rod is visible.
6. Use the e-clip tool to mount the e-clip in the groove.
Figure 11 Mount the E-clip
Groove on switch operating rod.
7. Place back the bushing and mount the cover back in place. Tighten the screws with 8.85 lbf.in (0.73 lbf.ft or
1 Nm) of torque.
IMPORTANT
Make sure that the bound seals are in place when mounting the cover screws.
Figure 12 Place back the bushing and mount the cover
Guide bushing Make sure that the bound seals
are in place when mounting the
cover screws
!
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