Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
48-3
A decrease in instrument signal pressure reverses the
described actions and causes a proportional inward
movement of actuator pistons and a reversal in pinion
direction.
Installation of XL90 Series Positioner on
Actuators
The XL90 can be installed on most sizes of rotary and
linear actuators. Actuators can be either double acting
or spring return. Cams can be used for direct acting or
reverse acting directions. These instructions apply to
rotary actuators only. For linear actuator mounting
instructions, consult the factory.
NOTE: For retrofitting to an actuator equipped
with an APEX positioner, the same bracket and
bolting may be used.
NOTE: NAMUR mounting is available with the
XL90 positioner. When retrofitting the XL90 posi-
tioner to an actuator equipped with another posi-
tioner, remove the existing positioner, tubing and
associated bolting. See tubing instructions in
Connecting XL90 Positioner Ports section.
Mounting Instructions for XL90 with
NAMUR Shaft Connection
1.
Mount the bracket to the actuator. Finger tighten
the bracket bolting.
2.
If required, install a coupler on the actuator shaft.
Make sure the shaft and coupler are centered. See
Figure 2.
3.
Verify the orientation of the actuator and coupler
flats match the positioner flats on the end of the
shaft. Loosen the cam if necessary. (See “Cam
Installation” instructions.)
4.
Install the positioner onto the bracket. Make sure
positioner shaft and coupler are engaged and cen-
tered. Finger tighten positioner bolts.
5.
Proceed to “Connecting XL90 Positioner Ports.”
Mounting Instructions for XL90
Positioner on Sereg Rotary Actuators
1.
Mount the positioner to the transfer case plate in the
proper orientation. Tighten the four bolts.
2.
Loosen jam nut (see “Cam Installation” instructions).
3.
Mount the follower arm, lockwasher and nut on the
end of the shaft and tighten nut. Carefully hold the
shaft with wrench on shaft flats.
4.
With valve in closed position, make sure follower
pin lever is mounted parallel to valve lever, flush
with end of valve shaft and the nut is tight.
5.
Place follower pin (mounted to the lever that is
mounted to the valve shaft) into follower arm slot
and bolt the transfer case plate in place finger tight
only. See Figure 3.
6.
Orient the cam to align the “L” shaped line located
on the left side of the characteristic curve through
the middle of the span arm roller. (See Figure 5.)
The valve should be seated when this alignment is
done. (See “Cam Installation” instructions). For
correct cam characteristic, see Table I.
7.
Proceed to “Connecting XL90 Positioner Ports”
instructions.
Connecting XL90 Positioner Ports
1.
For double acting actuators, connect positioner
ports 1 and 2 to the actuator. Port 1 is always
connected to the actuator port used to drive the
actuator away from its start or fail position (the
factory cam setting is full clockwise at minimum
input signal).
NOTE: For single acting, spring return actuators,
plug output 2
2.
Connect supply air to the port marked “SUPPLY”
3.
Connect air (for pressure inputs) or instrument
tubing or wiring (for 4-20 mA inputs). For current
inputs, the terminal is marked (+) and (-) inside the
I/P module. The I/P is factory calibrated and should
not require adjustment. If adjustments are neces-
sary, see “Calibrating I/P Module Zero and Span
Settings” section.
CAUTION: Signal air pressure higher than 30 psi
may damage the module gauge and instrument
signal capsule; a 3-15 psi instrument signal is
recommended on the pneumatic module.
4.
Stroke actuator/valve two or three times to align
positioner, coupler and actuator. With 50% input
(actuator/valve at 45 degrees), tighten all mounting
bolts. Stroke actuator/valve again to verify there is
no misalignment throughout the stroke.
5.
Calibrate valve and adjust cam if necessary. (See
“Cam Installation” and “Positioner Calibration” in-
structions.
Figure 4: Alignment
