User Instructions - Logix® 520MD+ Series Digital Positioner
FCD LGENIM0105-00
© Flowserve Corporation
10
Field Trial Version – Printed October 28, 2011
5 MOUNTING AND INSTALLATION
5.1
Mounting to Mark One Linear Valves
To mount a Logix 520MD+ positioner to a Valtek linear Mark
One valve, refer to Figure 4: 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.
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
horizontal when the valve is at 50% stroke and should move
approximately ±30° from horizontal over the full st roke 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.
Figure 4: Mounting to Mark I Linear Valves
Follower Pin
Follower Arm
Bracket
Positioner
Feedback
Shaft
Take-Off Arm
Stem Clamp
Take-Off Arm
Pin Slot
Summary of Contents for Logix 520MD+
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