Festo Неполноповоротный привод DFPB User Manual
Page 5
To attach the DFPB onto a process valve:
1. Place the DFPB on the switching shaft of the
process valve.
Make sure here that the square shaft of the
process valve sits in the double−square coupling of
the DFPB without being tilted.
2. Fasten the DFPB to the connecting flange of the
process valve with 4Ăcorrosion−resistant screws.
3. Tighten all the screws in diagonally opposite
sequence.
4.Check that the DFPB turns in the required direction
of rotation and whether the processing valve
assumes the required position.
If the DFPB does not work in the required direction of
rotation, loosen the screws and turn the DFPB to the
attachment of the process valve on the opposite
side.
Fig. 3
In the case of upside−down mounting and
simultaneous sensing by means of a "puck",
appropriate measures must be taken to ensure that
the puck cannot come off the drive together with the
shaft adapter.
Fig. 4
6.2 Pneumatic installation
Connect the tubing for the air supply as follows:
DFPB (double−acting)
DFPB (single−acting)
Air supply at connection 2 (A)āā:
Ĉ The pistons of the semi−rotary drive are pressurized inside and pressed outwards.
Ĉ The transmission shaft
3 rotates in the direction of the arrow (see housing top and bottom)
Ĉ Depending on whether it is installed on the top of the bottom of the DFPB, the process valve
opens or closes.
Air supply at connection 4 (B)āā:
Pressure drop at connection 2 (A)āā:
Ĉ The pistons of the semi−rotary drive are presĆ
surized outside and pressed inwards.
Ĉ The transmission shaft
3 rotates against
the direction of the arrow (see housing top
and bottom)
Ĉ The connected process valve is actuated.
Ĉ The pistons of the semi−rotary drive are presĆ
sed inwards by spring force.
Ĉ The transmission shaft
3 rotates against
the direction of the arrow (see housing top
and bottom)
Ĉ The connected process valve is actuated.
When a DFPB (single−acting) is used in a moist and/or dusty environment:
Note
Moisture and dirt particles can penetrate via exhaust port 4 (B) and destroy the
product.
· Take preventive measures in accordance with the following table.
Ambient
temperature
Remedial action
Moist and dusty
Provide an exhaust feedback at exhaust port 4 (B).
Dusty
Screw a silencer (è www.festo.com/catalogue) into the exhaust port 4 (B).
When a solenoid valve is used:
· Use a solenoid valve with NAMUR port pattern.
7
Commissioning
Note
· Make sure that the operating conditions lie within the permitted ranges
(è Technical specifications).
The product is ready for operation as soon as it is fitted and electrically and
pneumatically connected.
· Make sure that a process valve fitted to the DFPB can be switched without
hindrance.
· Slowly pressurise the DFPB.
7.1 End−position adjustment
The end position setting of the DFPB serves to optimise the opening or closing
reaction of the connected process valve.
The swivel angle of the DFPB variants can be set to ±4°:
Ĉ with double−acting semi−rotary drives, it is possible to set the piston stop only in
the outer end position,
Ĉ with single−acting semi−rotary drives, it is possible to set the piston stop only in
the inner end position.
Note
The semi−rotary drive is only seal−tight when the locking nuts are tightened.
· When operating the DFPB, make sure that the adjusting screws
9 or aJ are
secured with the locking nuts
7.1.1 End−position adjustment for double−acting DFPB
Preparation for setting the outer end position of the double−acting DFPB
1. Turn the locking nuts
7 down on both sides of the DFPB.
2. Briefly pressurise the DFPB at the port 2 (A). The pistons move to the outer end
position.
7
9
7
9
Fig. 5
Setting the outer end position of the double−acting DFPB
1. Exhaust the DFPB.
2. Using an Allen key, turn the adjusting screw
9 clockwise until the connected
process valve reaches the desired position.
3. Turn the opposite adjusting screw
9 clockwise until you feel resistance. Make
sure that this does not change the position of the connected process valve.
4.Pressurise the DFPB and check whether the connected process valve reaches
the desired position.
Expanding the outer end position of the double−acting DFPB:
5. Exhaust the DFPB.
6. Using an Allen key, turn the adjusting screws
9 just a few turns
counter−clockwise out of the housing of the DFPB.
7. Pressurise the DFPB at the port 2 (A) again.
The pistons move to the expanded outer end position.
7.1.2 End−position adjustment for single−acting DFPB
Preparation for setting the inner end position of the single−acting DFPB
1. Exhaust the DFPB.
2. Turn the locking nuts
7 down on both sides of the DFPB.
7
aJ
7
aJ
Fig. 6
Note
Risk of damage to the device.
· Ensure that the adjusting screw is never screwed all the way into the cover,
as this prevents end−position adjustment, thus necessitating repair.
See
Chapter 9, Disassembly and repair".