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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  of  all  braking  ramps  in  your  controller  or  the  higher−level

controller (deceleration values and jerk).

· Make sure that the deceleration values (braking deceleration, deceleration

times),  taking  into  account  the  speed  of  travel,  moving  load  and  mounting
position,  are  set  so  that  the  maximum  drive  torque  or  maximum  feed  force  of
the  linear  axis  used  are  not  exceeded.

· To design the linear axis, use the Festo design software Positioning Drives"

(

www.festo.com).

Note

Block−shaped  acceleration  profiles  (without  smoothing)  cause  high  peaks  in  the
drive  force,  which  can  result  in  drive  overload.  In  addition,  through  overswing
effects,  positions  outside  the  permissible  range  can  occur.  A  smoothed
acceleration  specification  reduces  vibrations  in  the  overall  system  and  has  a
positive  effect  on  the  mechanical  equipment  load.
· Check  which  regulator  settings  can  be  adjusted  (e.g.  smoothing,  flattening  of

the acceleration profile).

Note

The  elasticity  of  the  toothed  belt  delays  the  acceleration  behaviour  of  the  ELGR
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. Check travel

2. Homing

3. Test run

Determining  the
direction  of  movement  of
the  motor

Adjusting  the  real
situation  with  the  image
in  the  controller

Checking the complete
behaviour

Fig.13: Definitions

1. Start

check travel

with low dynamics.

In spite of equal control, motors of the same type sometimes turn in the
opposite direction 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 fulfils the following conditions:

The slide unit must be able to move through the complete intended

positioning cycle.

The slide unit must stop as soon as it reaches a limit switch.

5. If the proximity switches do not respond:

chapter11 Eliminating faults" and

the operating instructions for the proximity switches.

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 providing a protective screen),

there  are  no  objects  obstructing  the  positioning  path.
It  should  not  be  possible  to  touch  the  ELGR  until  the  mass  has  come  to  a
complete  standstill.

If the motor is turned around:

Note

When  the  motor  is  removed  (e.g.
turning  the  motor)  the  reference
position  is  lost.
· Start  homing  as  detailed  in  the

chapter Commissioning" in order
to set the new reference position.

Fig.14

Care and maintenance

Warning

Moving masses can cause personal injury and material damage (crushing).

If  a  toothed  belt  breaks  in  combination  with  a  vertically  or  diagonally  fitted  ELGR,
the  work  mass  will  fall  down.
· Send  the  ELGR  to  Festo  for  repairs  when  there  are  signs  of  wear.

Controller signals can cause the ELGR to make unintentional movements.
· For all maintenance work on the ELGR, switch off the controller and secure it

to prevent it from being switched back on unintentionally.

On cleaning and care:
· Clean the ELGR as required with a soft cloth.

Use any non−abrasive material as a cleaning agent.
Relubrication of the ELGR is not permitted.

· 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.

Disassembly and repairs

Note

Retensioning  of  the  toothed  belt  reduces  its  service  life  considerably.  In
addition,  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 to our repair service.

This ensures that special attention will be paid to the necessary fine
adjustments and inspections.

· Information on spare parts and aids can be found under:

www.festo.com/spareparts

Accessories

Note

Please select the appropriate accessories from our catalogue

www.festo.com/catalogue

Eliminating malfunctions

Malfunction

Possible cause