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For installa on in Ex. situa on: refer to special condi ons in Sec on 5 of this manual. Use only Ex. cer fied product
8.2.1.3. Fi ng the control head—Rotary actuator
1.
Secure the rotary target assembly to the indicator sha of the F257 ¼ turn actuator or actuator moun ng kit. Ensure
the grub screw (set screw) locates into the dimple provided on the drive flat.
2.
Locate the rubber base gasket on to the step on the top of the actuator or moun ng kit adaptor.
3.
Fit the two O‐rings into the round & oval recesses in the underside of the base of the control head, the larger O‐ring
will need to be worked into its recess. It is be er NOT to apply grease, the O‐ring will be easier to fit and keep in place
if not lubricated.
4.
Fit the control head over the target assembly onto the actuator, ensuring the O‐rings in the base of the head line up
with the internal air por ng in the top of the actuator. When the control head is being fi ed to any actuator other
than the F257 ¼‐turn, the external air por ng is used and the adaptor will blank off these ports. Check any moun ng
holes do not foul the O‐rings.
5.
Fasten the head down by means of the two M6 socket head cap screws. Torque down to 3.5 NM. Do not over ghten.
6.
Fit the two plugs supplied with the rotary target assembly into ports 'A' & 'B' in the control head.
Note: When the control head is used in an applica on other than the internally ported F257 actuator, Port B is "live" when the
solenoid is De‐energised, and Port A is "live" when the solenoid is Energised.
8.2.1.4. Limit Switch and Rotary Target Se ng
Se ng the switch height:
The height of the switches have been factory set for use on the F257 ¼‐turn actuator. If the control head is fi ed to another
actuator the switch heights may need to be adjusted to suit the target height. The switch to indicate the open posi on is
opposite the terminal block, the switch to indicate closed is opposite the solenoid. The target area of the switches (the
crosshairs) should line up with the metal target cams.
To adjust the switch height, turn the adjus ng screw (through the switch holder) to raise or lower the switch.
Se ng the target cams:
1.
Operate the actuator to the fully open posi on, using the manual solenoid control bu on.
2.
Slacken the central screw (slo ed head screw) on the rotary target assembly one full turn.
3.
Adjust the top cam by turning the adjus ng screw marked 'OPEN' with a small flat blade screwdriver so the target is
lined up with the centre of the switch.
4.
Operate the actuator to the fully closed posi on
5.
Adjust the bo om cam by turning the adjus ng screw marked 'CLOSED' using the screwdriver so the target is lined up
with centre of the switch.
6.
A er se ng the cams, re‐ ghten the central clamping screw firmly and check that the switch se ng is as required.
7.
The above procedure is made simpler if the control head module is connected to the power source as you will see the
posi on LED's working.
8.
If necessary adjust the solenoid valve speed controls to control the opening and closing speed of the actuator. Make
sure they are locked off properly before closing up.
8.2.2. Pneuma c and electrical connec ons
Pneuma c installa on
See Chapter "10. Pneuma c Installa on"
Electrical installa on
see Chapter "11. Electrical Installa on"
ROCOL Sapphire Silicone grease for lubrica on of the control head cap thread and O‐ring seal. Alterna vely use Klüber
Paraliq GTE 703.
Pg 24
F783E Ex‐ia
00‐ISN‐203_Rev B
29/01/2021
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