4 INSTALLATION – MOUNTING
NOTE: The Logix 3800zb positioner can be mounted in any
orientation.
4.1 Mounting to Mark One Linear Valves
To attach a Logix 3800zb positioner to a Valtek linear Mark I
valve, refer to Figure 5: Mounting to Mark I Linear Valve and
proceed as outlined below. Refer to Figure 11 if using a Namur
shaft. Refer to, APPENDIX G - HOW TO ORDER, for
complete linear actuator mounting kit listings. Note: The Logix
3800zb is only certified for use with Valtek Linear Mark I
Valves 50, 100 or 200 sizes.
1 Remove washer and nut from follower pin assembly.
Insert pin into the appropriate hole in follower arm, or
locate the pin along the slot in the follower arm based on
stroke length. The stroke lengths are located on the
follower arm. Make sure the stamped side of the arm is
toward the unthreaded end of the pin. Reinstall the lock
washer and tighten the nut to complete follower arm
assembly.
2 Slide the slot in the follower arm assembly over the flats
on the position feedback shaft on the back of the
positioner. The follower arm will be specific to a D shaft
or a Namur shaft. Rotate the arm until the arm is pointing
toward the side of the positioner with ports A, B, and
Supply. Slide the lock washer over the threads on the
shaft and tighten down the nut.
NOTE: The feedback shaft has a clutch mechanism that
allows for over-rotation of the shaft for easy adjustments.
3 Align the bracket with the three outer mounting holes on
the positioner. Fasten with 5/16-18 UNC bolts.
4 Screw one mounting bolt into the hole on the yoke
mounting pad nearest the cylinder. Stop when the bolt is
approximately 3⁄16" from being flush with the mounting
pad.
5 Slip the large end of the slotted mounting hole in the back
of the positioner/bracket assembly over the mounting
bolt. Slide the small end of the teardrop under the
mounting bolt and align the lower mounting hole.
6 Insert the lower mounting bolt and tighten the bolting.
7 Position the take-off arm mounting slot against the stem
clamp mounting pad. Apply Loctite 222 to the take-off
arm bolting and insert through washers into stem clamp.
Leave bolts loose.
8 Center the take-off arm on the follower pin.
9 Align the take-off arm with the top surface of the stem
clamp and tighten bolt. Torque to 120 in-lb.
NOTE: If mounted correctly, the follower arm should be
horizontal when the valve is at 50% stroke and should move
approximately ±30° from horizontal over the full stroke of the
valve. A stroke calibration error will occur if the positioner is
mounted incorrectly, and the indicator lights will blink a RRYG
code indicating the position sensor has gone out of range on
one end of travel, or the travel is too small. Reposition the
feedback linkage or the positioner to correct the error.
NOTE: To virtually eliminate non-linearity, use the
Linearization feature in the Custom Characterization page of
the DTM.
Figure 5: Mounting to Mark I Linear Valve
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