Manual

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Assembly8.1.
For the installation of the Control Head Type 8681 to a
process valve, you will require a process valve-specifi c hub
fl ange as an adapter. The hub fl ange must be adapted to
the design of the process valve.
Mount the piston rod with the target on the process

valve spindle. Observe reference dimensions!
Fasten the hub fl ange on the process valve. 
During this, observe central alignment and sealing
conditions!
Check the secure fi t of the sealing rings (in the upper 
and lower grooves).
Mount the control head on the hub fl ange (seamlessly

360° rotatable).
Secure the control head with the two locking screws 
(shoulder screws M5) in the middle grove of the hub
fl ange (see operating instructions).
Pneumatic Installation8.2.
Connect the required working connections 2/A1 to 2/ 
A3 (each according to model) with the corresponding
connections on the process valve.
Connect the supply line to supply pressure connection

1/P (2.5 to 8 bar).
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A silencer has already been mounted on the Exhaust 
Air Connection (3/R) in the supplied state.
1/P
Supply pressure
connection
3/R
Exhaust air
connection
(Silencer)
2/A3: SV 3 2/A2: SV 2 2/A1: SV 1
2/A1 ... A3 - Working connections - Solenoid valves (SV)
Sealing lugs
at the
housing
The fl ow restriction screws
R and P of the solenoid valves
(see operating instructions) are
used for setting the air intake and
exhaust for the working connec-
tions (for setting of the control
speed of the process valves).
R
P
open close
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Opening and Closing the 8.3.
Housing
Opening:
Loosen plastic self-cutting screws or seal, if housing

has been secured.
Open the plastic hood by turning counterclockwise (all

the way, approx. 1.5 cm).
Closing:
Put the plastic hood on the lower part such that the

inner lugs are positioned over the fastening grooves
and the external sealing lugs are positioned almost over
each other. Press the hood completely over the seal of
the lower part.
Turn the hood by approx. 1.5 cm clockwise (meaning 
until the sealing lugs are positioned over each other).
A seal or a hood safeguard using plastic self-cutting
screws is required in the explosion-risk area!
Electrical Installation8.4.
see chapter
9. 24 V DC - Design , 10. AS-I - Design ,
11. DeviceNet- Design or 12. 120 V AC - Design .
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9. 24 V DC - DESIGN
Connection options9.1.
left: 1 x M16 x 1,5 cable
gland
for power supply and
signals
left: 1 x M16 x 1,5 cable
gland with multi-pole
connection (M12 plug
according to IEC 61076-
2-101, 12-pole) on a cable
of 8 cm length
right: 1 x M16 x 1,5 cable
gland for external initiator
right: 1 x M16 x 1,5 cable
gland for external initiator
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Type 8681