Linear drive
DFPI-…-ND2P-C1V-NB3P-A
Festo AG & Co. KG
Postfach
73726 Esslingen
Germany
+49 711 347-0
www.festo.com
(en)Operating instructions
8062742
1608
[8062744]
Original: de
Linear drive DFPI-…-ND2P-C1V-NB3P-…
English
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1
Configuration
1
2
3
aA
aB
aJ
4
5
6
7
5
8
9
1
Housing
2
Electrical and pneumatic connec
tion (under the protective cap)
3
End cap
4
Bearing cap
5
Mounting interface in accordance
with ISO 15552
6
Air duct
7
Pressure compensation element
8
Earth terminal
9
Flow control screw
aJ
Piston rod with mounting thread
for accessories
aA
Spanner flat
aB
Tie rod
Fig. 1
The DFPI-…-ND2P-C1V-NB3P- is an electropneumatic linear drive consisting of:
– a double-acting pneumatic cylinder with
– integrated displacement encoder (potentiometer) for determining the actual
position
– integrated valve block with directional control valves for controlling the piston rod
– integrated positioner for position control.
Proximity sensors can be screwed onto the tie rods if necessary for additional bin
ary sensing of positions.
A pressure compensation element prevents the formation of condensate inside the
housing in the event of temperature fluctuations, thus protecting the internal elec
tronics.
For DFPI-…-ND2P-C1V-NB3P-... the electrical and pneumatic connections are pro
tected against external mechanical influences by a rugged flange receptacle.
The compressed air supplied from one side is fed via an unprotected line parallel
to the cylinder barrel. Tie rod screws are used to attach the cylinder end cap.
Accessories
è
www.festo.com/catalogue.
Feature
Type code
Description
Type
DFPI
Regulated drive for process automation
Piston diameter
100, 125, 160, 200,
250, 320
Specifications in [mm]
Stroke
...
Stroke length freely selectable in the range from
40 to 990; specifications in [mm]
Function
Not specified
Double-acting
Cushioning
N
No cushioning
Displacement en
coder
D2
Analogue
Method of measure
ment
P
Potentiometer
Regulation
C1
Controller 1
Directional control
valve
V
Integrated
Standard
NB3
Based on ISO 155522
Connection type
P
Protected pneumatic connections
Safety position
Not specified
R
Piston rod advancing
Piston rod retracting
Feedback
A
Analogue feedback
Fig. 2
Type code (e.g. DFPI-100-200-ND2P-C1V-NB3P-A)
2
Safety
Intended use
The DFPI-…-ND2P-C1V-NB3P-... linear drive is intended for regulation in process
engineering systems. It is particularly appropriate for pneumatic positioning under
rough operating conditions.
Only use the product in its original status, without any unauthorised modifications.
Only use the product if it is in perfect technical condition.
Use only proximity sensors approved for the product.
Take into consideration the ambient conditions at the location of use.
Observe the specifications on the product labelling.
Comply with all applicable national and international regulations.
Operating medium
Only use compressed air in accordance with the specifications (
è
Chapter 11).
Only use unlubricated compressed air under normal conditions. Once the
product has been used with lubricated compressed air, it must continue to be
operated with compressed air only.
Drive
Impermissible lateral forces on the piston rod can damage the rod bearing or the
linear drive.
Do not exceed the maximum permissible lateral forces on the piston rod
(
è
Fig. 11).
Guide the piston rod, if necessary, to avoid start-up oscillations.
Return to Festo
Hazardous substances can endanger the health and safety of personnel and cause
damage to the environment. To prevent hazards, the product should only be re
turned upon explicit request by Festo.
Consult your regional Festo contact.
Complete the declaration of contamination and attach it to the outside of the
packaging.
Comply with all legal requirements for handling hazardous substances and
transporting dangerous goods.
3
Function
The compressed air applied at connection P
is directed by the integrated valve block al
ternately to the two piston chambers of the
cylinder – depending on the setpoint posi
tion that is specified. This causes the piston
rod connected to the piston to move
backwards and forwards.
Fig. 3
The maximum possible venting of the two cylinder chambers can be set independ
ently of each other using flow control screws D2 and D4. D2 controls the venting
flow when the piston rod advances. D4 controls the venting flow when the piston
rod retracts. This can be used to control the maximum travel speed of the linear
drive in the range from 0 %...100 %. In the factory setting, the flow control screws
are completely open.
Positions are specified via an analogue setpoint signal (4…20 mA). The piston rod
is positioned in a controlled manner.
The integrated positioner performs position control of the piston rod within the
available stroke range.
