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4.4.8 The adjustment of zero and range is completed as in section 4.2
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5. MAINTENANCE AND TROUBLESHOOTING.
The AP positioner is designed for a long life with very little maintenance required if it is supplied with clean, dry oil free air, as recommended in section 2.3.
When the positioner lid is removed, take care not to remove all grease from the lid/coupling seal. If it does need replenishing then ensure that a synthetic grease is used as a mineral oil grease will adversely affect this seal.
If, however, any of the parts do need replacement because of adverse conditions, then refer to Kinetrol Ltd for spare parts together with any instructions for replacing and resetting.
The following trouble shooting guide should help in the unlikely event of a problem with the performance of the unit. If problems persist, contact your local Kinetrol distributor or Kinetrol Ltd for further advice.
6. ANGLE RETRANSMIT OPTION.
6.1.1 Move actuator vane to mid travel position, with its output square as shown in Figure 1. This is advisable to preventsubsequent error in orientating positioner coupling. (This is not necessary with spring return actuators as there can be no confusion with square orientation).
6.1.2 Remove positioner cover and unscrew the three M4 screws retaining the red retransmit plate, release the two wireson the terminal block connected to the DIN plug (if fitted), as shown in Figure 7, and carefully remove coupling and retransmit assembly as one unit.
6.1.3 Bolt the positioner body to the actuator in the orientation shown in Figure 1 taking care that the two O'rings are in place to seal the ports to the actuator (place a small amount of grease on to the O'rings to keep them in place) and that the actuator shaft is centred in the hole in the body.
6.1.4 Observe the direction that the cam moves with a rising signal and that the retransmit strap is fitted to the correct slot in the lower coupling as marked (C & A for clockwise and anticlockwise respectively). If the direction is not as requiredthen refer to section
6.1.5 Ensure that the coupling is pushed fully on to the actuator square and tighten the central fixing screw which willhave the effect of centralising the cam follower on the cam track. Retighten the three angle retransmit retaining screws and refit the two DIN plug wires (if fitted).
6.2 Change of Direction for Rising Signal (direct mounting units only).
6.2.1 Move the actuator to approximately mid-position to avoid problems in correct orientation later. This is obviously not possible or necessary with spring return models because the position of the vane will be known. Reduce both main supply and signal pressures to zero.
6.2.2 Remove positioner cover and undo the three M4 screws retaining the red retransmit plate, release the two wires on the terminal block connected to the DIN plug (if fitted), as shown in figure 7. Loosen the central coupling screw sufficiently to carefully pull the coupling complete with the retransmit assembly off the actuator square.
6.2.3 Release the potentiometer strap from the slot in the lower coupling, as shown in figure 8, remove the internal indicator from the coupling and withdraw the coupling from the retransmit plate.
6.2.4 Pull the two halves of the coupling apart sufficiently to allow the cam to be withdrawn from its location peg. Flip the cam over and push it back into the slot between the two coupling halves and locate it back on the peg.
6.2.5 Refit the coupling to the retransmit plate, slide the internal indicator over the top of the coupling and refit the potentiometer strap into one of the two marked slots of the lower coupling (marked 'A' and 'C' for anticlockwise and clockwise movement respectively).
6.2.6 If when the coupling was removed, the collet was left behind on the actuator square, remove the collet from the square and push it into the lower half of the coupling ensuring that it locates in the semicircular 'pip' and tighten the clamping screw by two turns. Place the coupling and retransmit assembly back on the actuator square so that the cam follower is approximately half way up the rise of the cam whilst holding back the two retransmit wires and pull back the spring lever with the other hand and tighten the coupling clamping screw. Re-tighten the retransmit plate retaining screws and refit the retransmit wires to the terminal block.