Flowserve 3400MD Digital Positioner - Manual (Page 13)

13
Logix 3400MD Digital Positioner FCD LGENIM3404-08-AQ – 5/15
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5.3 Optional Valtek Rotary Mounting
Procedure
(See Figure 5)
The optional rotary mounting applies to Valtek valve/actuator
assemblies that are equipped with mounted volume tanks or
handwheels. The optional mounting uses a four-bar linkage coupled
to the valve shaft. The following tools are required:
• 3 ⁄
8
” open-end wrench
• 7 ⁄
16
” open-end wrench
• 1/2” open-end wrench
1. Using a 1/2” open-end wrench and two 5 ⁄
16
-18 x 1/2” bolts, attach
bracket to actuator transfer case pads. Leave bracket loose to
allow for adjustment.
2. Using four 1/4-20 x 1/2” bolts and a 7 ⁄
16
” open-end wrench, fasten
positioner to universal bracket, using the four-hole pattern
that locates the positioner the farthest from the valve. Rotate
positioner 90 degrees from normal so gauges are facing upward.
3. Attach follower arm to positioner feedback shaft, using the star
washer and 10-32 nut.
4. Attach tripper and tripper clamp to valve shaft using two 1/4-20
bolts and two 1/4-20 locknuts. Leave tripper loose on shaft until
final adjustment.
5. Thread ball joint linkage end to tripper and tighten (thread
locking compound such as Loctite is recommended to prevent
back threading). Adjust the length of tie rod so follower arm and
tripper rotate parallel to each other (the rod must be cut to the
desired length). Connect the other ball joint end to follower arm
using a star washer and a 10-32 nut.
6. Tighten bracket and tripper bolting.
7. Check for proper operation, note direction of rotation.
c DANGER: If rotating in wrong direction, serious damage will
occur to the positioner and/or linkage. Check air action and stroke
direction carefully before initiating operation.
5.4 NAMUR Mounting Option
Logix 3200MD is available with a NAMUR output shaft and mounts
on an actuator using the ISO F05 holes. Proper alignment of the
positioner shaft to the actuator shaft is very important since improper
alignment can cause excess wear and friction to the positioner.
5.5 Tubing Positioner to Actuator
The Logix 3400MD digital positioner is insensitive to supply pressure
changes and can handle supply pressures from 30 to 150 psig.
NOTE: A supply regulator is recommended if the customer will
be using the diagnostic features of the Logix 3400MD but is not
required. In applications where the supply pressure is higher than
the maximum actuator pressure rating a supply regulator is required
to lower the pressure to the actuator’s maximum rating (not to be
confused with operating range). An air filter is highly recommended
for all applications where dirty air is a possibility.
NOTE: The air supply must conform to ISA Standard ISA 7.0.01 (a
dew point at least 18°F below ambient temperature, particle size
below five microns—one micron recommended—and oil content not
to exceed one part per million).
Air-to-open and air-to-close are determined by the actuator
tubing, not the software. When air action selection is made during
configuration, that selection tells the control which way the actuator
has been tubed. The top output port is called Output 1. It should be
tubed to the side of the actuator that must receive air to begin the
correct action on increasing signal. Verify that tubing is correct prior
to a stroke calibration.
NOTE: Proper tubing orientation is critical for the positioner to
function correctly and have the proper failure mode. Refer to Figure 1
and follow the instructions below:
Linear Double-acting Actuators
For a linear air-to-open actuator, the Output 1 port of the positioner
manifold is tubed to the bottom side of the actuator. The Output 2
port of the positioner manifold is tubed to the top side of the actuator.
For a linear air-to-close actuator the above configuration is reversed.
Rotary Double-acting Actuators
For a rotary actuator, the Output 1 port of the positioner manifold
is tubed to the bottom side of the actuator. The Output 2 port of
the positioner manifold is tubed to the top side of the actuator. This
tubing convention is followed regardless of air action. On rotary
actuators, the transfer case orientation determines the air action.
Single-acting Actuators
For single-acting actuators, the Output 1 port is always tubed to the
pneumatic side of the actuator regardless of air action. The Output 2
port must be plugged.