Festo ELGR Manual Del Usario página 7

Note
Incorrect specification values of the braking ramp in STOP situations (e.g.
EMERGENCY STOP, Quick Stop) result in an overloading of the linear axis and can
destroy it or drastically reduce the service life.
· Check the settings for all braking ramps in your controller or the higher−order
control system (delay values and jerk).
· Taking the travel speed, moving mass and mounting position into account,
make sure that the delay values (brake delay, time delays) are set in such a
way that the maximum driving torque or feed force of the linear axis being
used is not exceeded.
· Use the Festo Positioning Drives" sizing software to dimension the linear axis
è www.festo.com.
Note
Block−shaped acceleration profiles (without jerk limitation) cause high peaks in
the motive force, which can lead to overloading of the drive. In addition,
positions outside the permissible range may occur as a result of overshoot
effects. A jerk−limited acceleration specification reduces the vibrations in the
entire system and has a positive effect on the stress in the mechanical system.
· Check which controller settings can be adjusted
(e.g. jerk limitation, smoothing of the acceleration profile).
Note
The elasticity of the toothed belt delays the acceleration behaviour of the ELGR/
ELGG and results in larger accelerations than are set on the controller (spring
effect).
· Take into account possible deviations from the acceleration set at the
controller.
1. Control run 2. Homing
Determining the Comparing the real
approach direction situation with the image
of the motor in the controller
Fig. 13: Definitions
1. Start a control run with low dynamics.
Despite having the same control systems, motors of the same design
occasionally turn in opposite directions due to the circuitry.
2. Start homing in accordance with the operating instructions for your motor drive
system with low dynamics up to the reference switch.
3. Start a test run with low dynamics.
4. Check whether the ELGR/ELGG fulfils the following requirements:
The slide must be able to move through the complete intended positioning
cycle.
The slide must stop as soon as it reaches a limit switch.
5. If the proximity sensors do not respond: è chapter 11 Eliminating faults" and
the operating instructions for the proximity sensors.
7 Operation
Warning
Moving masses can cause personal injury and material damage (crushing).
· Make sure that, in the positioning range:
nobody can place his/her hand in the path of the moving load
(e. g. by means of a protective guard)
there are no foreign objects.
It should not be possible to touch the ELGR/ELGG until the mass has come to a
complete standstill.
If the motor turns in the wrong direction:
Note
If the motor is dismantled
(e.g. motor rotation) the reference
position will be lost.
· Start homing as detailed in the
chapter Commissioning" in order
to set the new reference position.
3. Test run
Checking the overall
behaviour
Fig. 14
8 Service and maintenance
Warning
Moving masses can cause personal injury or material damage (crushing).
If a toothed belt breaks in combination with a vertically or diagonally fitted
ELGR/ELGG, the work mass will fall down.
· Send the ELGR/ELGG to Festo for repairs when there are signs of wear.
Controller signals can cause the ELGR/ELGG to make unintentional movements.
· For all maintenance work on the ELGR/ELGG, switch off the controller and
secure it to prevent it from being switched back on unintentionally.
Cleaning and maintenance:
· Clean the ELGR/ELGG as required with a soft cloth.
All media gentle to the material may be used as cleaning agents.
Relubrication of the ELGR/ELGG is not permissible.
· Regularly check the play in the plain−bearing guide according to your
application. Depending on the load, the guide backlash rises with increasing
duration of operation.
9 Disassembly and repair
Note
Retensioning of the toothed belt reduces its service life considerably. In addi
tion, the technical specifications, e.g. the feed constant, will be modified.
· Make sure that the toothed belt has not been retensioned.
The toothed belt is pretensioned so that it does not have to be retensioned
during its life.
· Recommendation: Return the ELGR/ELGG to our repair service.
This ensures that special attention will be paid to the necessary fine adjust
ments and inspections.
· Information on spare parts and aids can be found under:
www.festo.com/spareparts
10 Accessories
Note
· Please select the appropriate accessories from our catalogue
è www.festo.com/catalogue
11 Eliminating malfunctions
Malfunction Possible cause
Squeaking The coupling is fitted too
noises, tight
vibrations or
rough running rough running
Distortions
Incorrect regulator
settings
Defective bearing
Toothed belt or slide el
ements worn
Slide does not Loads too high
move
Guide jammed
Clamping hub spins
Slide travels The proximity sensors do
beyond the end not react
position
Toothed belt Toothed belt pretension
j jumps off p ing too low
Incorrect regulator
settings
Loads too high g
ELGG stroke Position of the central
too small support incorrect
Fig. 15
Remedy
Adhere to the permissible coupling
spacing dimensions (è assembly
instructions for the motor
mounting kit)
Fit the ELGR/ELGG free of tension
(Pay attention to evenness of the
bearing surface è chapter
5.1Mechanical installation)
Modify travel speed
Modify the regulator parameters
Send ELGR/ELGG to Festo for /
repairs
Reduce load mass
Reduce torques
Check how the motor mounting kit
is fitted (coupling)
Check the mounting level of the
proximity sensors, connections and
controller
Send ELGR/ELGG to Festo for
repairs
Change the regulator parameters
Reduce load mass
Reduce travel speed
Fix the central support exactly in
the middle position