15
Logix
®
520MD+ and 510+ Digital Positioners FCD LGENIM0105-15-AQ – 05/16
flowserve.com
5
MOUNTING AND INSTALLING
5.1 Mounting to Mark One Linear Valves
To mount a Logix 500+ positioner to a Valtek linear Mark One valve,
refer to Figure 6: Mounting to Mark I Linear Valves and proceed as
outlined below.
1. Remove washer and nut from follower pin assembly. Insert pin
into the appropriate hole in follower arm, based on stroke length.
The stroke lengths are stamped next to their corresponding
holes in the follower arms. Make sure the unthreaded end of the
pin is on the stamped side of the arm. Reinstall lock washer and
tighten nut to complete follower arm assembly.
2. Slide the slot in the follower arm assembly over the flats on the
position feedback shaft in the back of the positioner. Make sure
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.
3. Align the bracket with the three outer mounting holes on the
positioner. Fasten with 1/4" 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 mounting pad.
5. Slip the large end of the teardrop shaped 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. Slide the appropriate pin slot of the take-off arm, based on stroke
length, over the follower arm pin. The appropriate stroke lengths
are stamped by each pin slot.
NOTE:
The feedback shaft has a clutch mechanism that allows
for over-rotation of the shaft for easy adjustments.
9. Center the take-off arm on the rolling sleeve of the follower pin.
10. Align the take-off arm with the top plane of the stem clamp and
tighten bolting. Torque to 120 in-lb.
NOTE:
If mounted properly, the follower arm should be horizon-
tal when the valve is at 50% stroke and should move approxi-
mately ±30° from horizontal over the full stroke of the valve. If
mounted incorrectly, a stroke calibration error will occur and the
indicator lights will blink a RGGY 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 rotate the position
sensor to correct the error.
NOTE:
To virtually eliminate non-linearity, use the Linearization
feature in the Custom Characterization page of the DTM.
Figure 6: Mounting to Mark I Linear Valves