Festo EGC-...-2H-PN - Handbuch (Seite 4)

3. Connect the tubing of the clamping unit and the linear drive with the directional
control valves intended for this purpose.
The following shows two examples of control circuits.
DGC EGC
CMMP-AS
Out A/Out B 1)
Valve control DGC(I) with clamping unit
(e.g. clamps in case of sudden pressure failure) Valve control EGC with clamping unit at the
controller CMMP-AS
1) depending on configuration
Fig. 4
5 Commissioning
Warning
Uncontrolled moving parts can cause injury to people in the vicinity of the linear
drive.
• Make sure that, after pressurization of the clamping unit, no uncontrolled
movements can occur at the linear drive.
No movement may be triggered in the case of a jammed clamping unit, since
otherwise excessive wear will occur on the clamping unit. If a movement oc-
curs with a jammed clamping unit, the proper function of the clamping unit
must be checked, since excessive wear has probably occurred.
• Make sure that, in the traversing area, no one can reach into the direction of
motion of the moving loads and that no foreign bodies can get in.
Note
The actuators may perform sudden unexpected movements.
• Consider that the specified technical data of the clamping unit must not be
exceeded.
In the case of DGC(I)-25/32 and EGC-80, the clamping unit is not suitable for
braking (
Technical data).
The dynamic forces must not exceed the static holding forces.
• Observe the commissioning instructions in the DGC(I)/EGC operating
instructions.
• Pressurize the clamping unit as follows:
For releasing the clamp For clamping the slide
4.5
1)
... 8 bar pressureless
1) Lower pressures will impair or prevent the release of the clamp hold
2) Hoses that are too long or hose cross sections that are too small between the valve and clamping unit
delay clamping and opening.
Fig. 5
6 Operation
If there is a change in the effective load:
• Comply with the safe loads (
Technical data).
Checking the clamp hold:
• Check regularly or after a sudden power failure through a brake test to make
sure that clamping is secure without an effective load:
1. Make sure that the axis is at rest.
2. Vent the clamping unit.
3. Pressurize the clamping unit with the test force through the axis for at least 5
seconds. The test force corresponding to the risk assessment must equal at
least the nominal force of the application.
The maximum movement must be within the tolerance window. This tolerance
window must be determined in the risk assessment.
With all applications:
• Protect the guide rail against contamination.
7 Disassembly and repair
Warning
Danger of injury! Preloaded springs can throw the spring casing 7 outward dur-
ing dismantling.
Loss of holding force! Loosening of the cover
2 causes the factory setting of the
clamping force to be lost. The slide will then possibly be held with reduced
clamping force or not at all.
• Make sure that the cover
2 and the spring casing 7 are not dismantled.
Note
The actuators may perform sudden unexpected movements.
• Make sure that the linear drive is deactivated and the clamping unit
exhausted.
• Send the product to our repair service if required.
This will ensure that special attention is given to the necessary fine tuning
and testing. The clamping unit does not usually require maintenance.
8 Troubleshooting
Malfunction Possible cause Remedy
Slide moves even
though clamping
unit is exhausted Operating pressure is applied, since
the valve or air vent is defective Check valve and air vent
Load too large Reduce the load
Contamination of the guide rail Clean guide rail
Control of the axis movement
defective Check control of the linear axis and
eliminate the error
Wear Send to Festo
Slide clamped
even though
clamping unit is
pressurized Insufficient operating pressure on
the clamping unit Increase operating pressure
(
Technical data)
An unexpected
movement takes
place after the
clamping unit is
released. In the case of EGC with spindle drive:
motor active and moves the axis Check activation of the motor
controller
Piston of the DGC(I) always runs
against an unpressurized chamber Always run against a pressurized
chamber (
DGC(I) commissioning)
Forces not balanced (e.g. through
large applied load with vertical
installation) Create balanced forces to the
extent possible
Fig. 6
9 Technical data
Type DGC(I)-...-1H-PN EGC-...-...H...-PN
Size 25 32 40 50 80 120 185
Design Spring-loaded clamping profile
Reliable component in accordance with DIN EN ISO 13849
Clamping type Clamping through spring,
Loosening through compressed air
Operating medium Compressed air to ISO 8573-1:2010 [7:4:4]
Pneumatic connection M5
Max. number of emergency
brakings
1)
– – 750 750 – 750 750
with reference energy [Nm] – – 35 35 – 35 70
Actuating time
(releasing/clamping) [ms] 100 (only clamping unit)
Static holding force
...-1H...-PN [N] 320 500 1200 1200 320 1200 1500
...2H-PN [N] – – – – 640 2400 3000
Max. axial movement during
clamping and releasing of the
clamping unit [mm] 0.2
Ambient temperature [°C] –10 ... +60
Operating pressure [bar] 4.5 ... 8
Moving applied load (clamping unit)
...-1H...-PN [kg] 0.7 0.9 3.2 3.9 0.7 2.3 4.9
...2H-PN [kg] – – – – 1.3 4.0 8.3
Materials (clamping unit)
Housing, cover, clamping jaws Coated steel
Piston Polyacetal
Spring Spring steel
Seals Nitrile rubber, polyurethane
1) Emergency braking is a braking of the effective load in case of power failure at the drive axis
Fig. 7