Pentair KEYSTONE F793 User manual

KEYSTONE
Rotary pneumatic positioner F793
Installation and Maintenance Instructions
Pentair reserves the right to change the contents without notice HDLDS-0046-EN-1309
Operation
Mounting to Pentair’s PremiAir and Keystone’s F79U, F79E, F790 and F796 series actuators.
1. For standard direct action operation (increasing signal to open actuator), ensure that the actuator
is in its CLOSED (fully clockwise) position, and that the flats on top of the positioner shaft are at
right angles to the longitudinal axis of the positioner.
For reverse action (increasing signal to close actuator), ensure that the actuator is in its OPEN
(fully anti-clockwise) position and that the flats on top of the positioner shaft are parallel to the
longitudinal axis of the positioner.
2. Fit the positioner to the top face of the actuator, using the correct mounting kit, so that the
longitudinal axis of the positioner is parallel to the actuator cylinder axis.
3. Ensure that the feedback cam in the positioner is correctly fitted with the correct range profile
bearing against the feedback arm roller.
(Positioners are stocked to suit 3-15 psig and direct action).
For direct action, ensure that anti-clockwise rotation of the positioner shaft will cause the cam to
compress the spring.
For reverse operation, ensure that clockwise rotation of the positioner shaft will cause the cam to
compress the spring.
4. Connect the air ports as shown in Fig. 1 for direct action and in Fig. 2 for reverse action.
Feedback Cam Signal
Air
supply
To actuator
open port
Figure 1 - Direct operation To actuator
close port
Exhaust
(on underside)
Feedback Cam Signal
Air
supply
To actuator
close port
Figure 2 - Reverse operation To actuator
open port
Exhaust
(on underside)
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Rotary pneumatic positioner F793
Installation and Maintenance Instructions
Pentair reserves the right to change the contents without notice page 2
Setting procedure
In most cases the positioner will be pre-set prior to leaving the factory. If readjustment is necessary,
follow the following instructions.
1. With the positioner correctly mounted to the actuator and cover removed, connect the air supply
and signal to the positioner.
2. Apply a of signal approximately 9 psig and gradually reduce this to 3 psig. If the actuator just
reaches the CLOSED position as the signal reduces to 3 psig, no adjustment is necessary.
3. If the actuator does not close fully at 3 psig, turn the hexagon zero adjusting nut 1/6 of a turn
clockwise and repeat step 2. Continue until zero is correctly achieved.
4. If the actuator reaches the CLOSED position before the signal reduces to 3 psig, turn the
hexagon zero adjusting nut 1/6 of a turn anti-clockwise and repeat step 2. Continue until zero is
correctly achieved.
5. Gradually increase the signal to 15 psig. If the actuator just reaches the OPEN position as the
signal reaches 15 psig, then no adjustment is necessary.
6. If the actuator does not reach the OPEN position at 15 psig, this is indicative of the spring rate
being too high. Loosen the grubscrew in the range adjustment collar, (see Fig. 3), hold the collar
stationary using a hexagon socket wrench, and turn the spring slightly clockwise. This will move
the actuator even further away from fully OPEN and the zero adjusting screw must be used to
achieve fully OPEN.
7. Conversely, if the actuator reached OPEN position before 15 psig, turn the spring slightly anti-
clockwise with respect to the rate adjusting collar. Again re-adjust the zero screw to achieve
exact fully OPEN.
The zero and range settings are highly interactive and steps 2 to 7 must be repeated until zero and
span are acceptable.
Note: In steps 3 to 7, clockwise and anti-clockwise rotations are as viewed from the adjusting nut
end of the spring.
Figure 3
Figure 4 - Direct operation
Feedback
cam
Zero adjusting screw
Hexagonal socket
wrench
Grub screw
Hex lock nut
Range adjustment
collar
Cover fitting
Ensure that the actuator is in the position corresponding to minimum signal, ie. CLOSED for direct
operation (see Fig. 4) and OPEN for reverse operation (see Fig. 5).
1. Remove the position indicator cover and position indicator from the main cover.
2. Fit the main cover over the shaft and secure to the body using a captive screw in each corner.
3. Fit the position indicator to the double ‘D’ at the top of the shaft.
4. Fit the position indicator cover to the positioner cover so that the zero degree markings are
disposed along the transverse axis of the positioner. Before finally securing the position indicator
cover, ensure that the cover is positioned so that the arrow indicates the exact position of the
actuator.
Figure 5 - Reverse operation
Technical data
Input signal single range 3 - 15 psi (0.2 - 1.0 bar) standard.
split range 3 - 9 psi (0.2 - 0.6 bar) 9 - 15 psi (0.6 - 1.0 bar).
cam characteristics linear
3 - lobe cam: curve 1, range: 3 - 15 psi = 90° movement.
curve 2, range: 3 - 9 psi or 9 - 15 psi = 65° movement.
curve 3, range: 3 - 15 psi = 65° movement.
other characteristics on request.
Supply media compressed air or gas, dry, dust and oil free with 5 filter element to inlet.
supply pressure 30 - 100 psi (150 psi max.) 2 - 8 bar (10 bar max.).
air consumption 0.6 cfm in balanced condition with 60 psi (4 bar) supply.
Environmental environmental temperature -5° to +160°F (-20° to +70°C).
mounting and mounting position as required. No limitations.
connections mounting kit universal mounting kit for Fig.790/796 series actuators.
air connections supply and output 1/4” BSP, signal 1/8” BSP
Materials of housing anodised aluminium alloy (stainless steel optional).
construction diaphragm nitrile rubber
valve spool stainless steel
cover anodised aluminium alloy (stainless steel optional).
Weight 4 lb. (1.85kg)
Options gauges instrument air 0 - 30 psi (0 - 2 bar) - 1 off.
supply air 0 - 150 psi (0 - 8 bar) - 2 off.
integral limit switches single pole double throw 10A 240V AC
inductive proximity sensors type NT2-V3-N.
Warning!
When Pressure Gauge is not required, fit
hex head socked screw from mounting kit
using proprietary none hardening sealing
compound or tape. If there is a requirement
to remove the socket screw for future
application, an applied torque of 200 lbs/ins
should not be exceeded.

125 10 2 1 10
250 10 1.5 1 10
15 3 1.5 15
30 10 3 1.5 10
50 3 0.8 0.8 2.5
75 1 0.6 0.6 0.5
125 0.5 0.5 0.5 0.07
250 0.25 0.25 0.25 0.03
Rotary pneumatic positioner F793
Installation and Maintenance Instructions
Pentair reserves the right to change the contents without notice page 3
Switch
cams
Switches
Feedback
3-lobe cam
(direct or
reverse acting)
Part Front View
(showing switchpack arrangement) 4 - off M5 mounting screws
(protruding 9 mm thro)
Exhaust
1/4 BSP
Terminal block
Signal or pressure gauge
Connection 1/8 BSP
Feedback 3-lobe cam
Part view on arrow ‘A’
(showing switchpack arrangement)
Outlet connection 1/4 BSP
(to actuator close port)
Outlet
connection 1/4 BSP
(to actuator open port)
Supply connection
1/4 BSP
Conduit entry - M20
Visual position
indicator
Valve Body
16 mm dia. x 11 A/F
90
234
170
85
73 83
93.5
41.3
Designation of connections: A & B = Working Lines P - Compressed Air Connection T- Exhaust Point X - Control Line
Switch details
Micro-switch details
Standard V9 type, single pole double throw (SPDT).
Switch ratings as table below:
Voltage Resistive Tungsten lamp load Inductive
load (Amps) load
(volts) (Amps) NC NO (Amps)
AC
DC
Up to 15
Proximity switch details
Type Pepperl & Fuchs NJ2-V3-N or as specified
Quantity 2 switches per unit
Sensing distance 2 mm maximum (metal face). NB. Separate amplifier required
Supply 8 V DC (Ri approx. 1kOhm)
Temperature range -25°C to +70°C
Repetition <0.01 mm
Hysteresis =0.05 mm Typ 3%
Output Sensor absent - 3mA or above
Sensor present - 1mA or below
Switching rate - 1kHz maximum.
Switch identification
Switch number Switch function
1 close limit
2 open limit
22.5

Rotary pneumatic positioner F793
Installation and Maintenance Instructions
Pentair reserves the right to change the contents without notice page 4
Wiring diagrams
Wiring diagram for Rotary Pneumatic Positioner with 2 micro-switches
Blue
Blue
Red
Red
Bottom switch (close)
Top switch (open)
Blue (-)
Brown (+)
Black (-)
Red (+)
Bottom switch (close)
Top switch (open)
Wiring diagram for Rotary Pneumatic Positioner with 2 Proximity switches
Cam setting procedure
1. Release both clamping screws by turning each screw approximately 1,5 turns anti-clockwise.
2. Operate positioner/actuator to CLOSE position.
3. Adjust “CLOSE” adjusting screw by turning clockwise until lower cam just triggers the lower
switch.
4. Operate positioner to OPEN position.
5. Adjust “OPEN” adjusting screw by turning anti-clockwise until upper cam just triggers the upper
switch.
6. Tighten both clamping screws to lock the cams in the set position.
7. Operate the positioner/actuator OPEN and CLOSED to check the cam operation and re-adjust if
necessary.
Retrofit procedure
1. Remove positioner cover.
2. Remove circlip from top of camshaft.
3. Remove spacer from camshaft.
4. Fit cam assembly onto hexagon camshaft with adjusting and clamping screws towards the
outboard end.
Note: The assembly has been made with a tight fill onto the hexagon shaft in order to eliminate
any backlash. It may be necessary to drive the assembly over the shaft. To do this, use the
original spacer as a drift and rive the assembly over the shaft using a light hammer.
5. Fit the microswitch/terminal plate as shown, using the two M5 hexagon socket cap screws.
6. Set the cams in accordance with the procedure.
7. Re-fit the cover.
Microswitch/terminal plate
Clamping screws Adjusting screws
Sectional plan view