Festo DSBC-…-E… - Handbuch (Seite 3)

ADN-…-EL… , DNC-…-EL…,
DSBC-…-E…
Festo AG & Co. KG
Postfach
73726 Esslingen
Germany
+49 711 347-0
www.festo.com
Operating instructions 8028761
1307d
[8028762]
Original: de
End-position locking
ADN-…-EL…, DNC-…-EL…, DSBC-…-E…
English . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Note
Installation and commissioning is to be carried out only by qualified personnel.
• If used in safety-relevant applications, additional measures are necessary,
e.g. in Europe the standards listed under the EC Machinery Directive must be
observed. Without additional measures in accordance with legally specified
minimum requirements, the product is
not suitable as a safety relevant com-
ponent in control systems.
• Note the specifications/instructions in the relevant documentation accompa-
nying the product.
1 Control sections and connections
DSBC-…-E…
1
2
3
4
1
2
ADN-…-EL…
4
DNC-…-EL…
1
2
3
4
1 End-position locking
2 Orifice for
– manual unlocking and locking
– Pressure compensation
3 Adjusting screw for end-position
cushioning (only for DNC-...-EL...
and DSBC-...-E...)
4 Compressed air supply port for
cylinder
Fig. 1
Fig. 2
2 Function and application
In the end position of the cylinder, the bolt of the end-position locking with spring
pre-stressing grips with positive locking into a slot of the piston rod. This positive
grip locks the piston rod.
For unlocking, first the cylinder chamber lying opposite the locked end position
(opposite chamber) is pressurized. Through pressurization of the cylinder chamber
of the locked end position, the bolt is then pressed out of the slot – the piston rod
is freely movable. The cylinder can be travelled by venting the opposite chamber.
Interlock is made after the end position of the cylinder is reached when the pres-
sure in the related cylinder chamber drops. As soon as the pressure force falls
below the spring force of the end-position locking, the bolt again grasps into the
slot of the piston rod.
During the unlocking and locking procedure, leakage can occur briefly at
the orifice 2.
The end-position locking is intended for holding a load in the event of a pressure
failure (e.g. if the cylinder mounting position is vertical).
3 Requirements for product use
• Compare the limit values in these operating instructions with your actual applic-
ation (e.g. pressures, forces, torques, temperatures). Operation of the product
in compliance with the relevant safety regulations is contingent on adherence to
the load limits.
• Ensure that there is a supply of correctly prepared compressed air.
• Make sure that the necessary operating pressure is maintained. (
7 Technical
data).
• Pressurize your complete system slowly until the operating pressure is reached.
No unexpected movements of the actuators will then occur.
For slow start-up pressurization use soft-start valve type HEL.
• Take into consideration the ambient conditions at the location of use.
• Also observe the regulations of the workers’ compensation trade association,
the German Technical Control Board (TÜV) or relevant national regulations.
• Note the warnings and instructions on the product and in the relevant operating
instructions.
• Use the product in its original status, without any unauthorised changes.
3.1 Mechanical installation
Note
The unlocking function can be disabled.
• Make sure that the orifice 2 of the end-position locking:
– is always open; otherwise, a back pressure can build up which prevents
unlocking.
– is not pressurized with compressed air; otherwise, the bolt will no longer
run out of the slot.
To avoid malfunctions:
• Do
not use the head of a screw as a position indicator.
If the head lies flush with the edge of the housing, you have no control whether
the bolt has actually locked into place completely.
When unlocking by hand:
1. Turn a screw ( table Fig. 5) through the orifice 2 of
the end-position locking into the thread of the bolt
(
Fig. 3).
2. Pull the screw, and with it the bolt, out of the slot. The
piston rod is now unlocked.
When you let go of the screw, the spring presses the
bolt back into the slot. The piston rod is locked again.
For permanent unlocking when setting:
• Use a screw with lock nut (A) to fix the bolt in the un-
locked position ( Fig. 3).
For permanent locking when setting:
1. Turn a screw ( table Fig. 5) into the thread of the
orifice 2 of the end-position locking until the bolt locks
the piston rod ( Fig. 4).
2. Secure the screw with a locking nut (in case of
vibrations).
Fig. 3
Fig. 4
(A)
ADN-/DNC-/DSBC-...-E... 20/25 32/40 50/63 80/100
For unlocking:
– screw (minimum length) M2 x 30 M2 x 30 M3 x 40 M3 x 50
– tensile force [N] 4 4 10 25
– stroke [mm] 2.7 3.5 4.7 6.0
For locking:
– screw with continuous thread
(minimum length)
M3 x 20 M3 x 20 M5 x 35 M5 x 45
Fig. 5