Assembly and Operating Manual
Gripper actuator GMC
11
Date printed 23.02.2011
8
Repairs
The repair or elimination of defects on our products by the customer may only be car-
ried out with our explicit written agreement. Any failure to adhere to this principle ren-
ders invalid our warranty and liability for any resulting warranty or secondary losses.
Following receipt and examination, all gripper actuators of series GMC can be repaired by
SCHUNK.
9
Response to malfunctions
Malfunctions that are caused by defective components may only be remedied by
replacement of these components.
Defective components may only be replaced by SCHUNK genuine replacement parts.
Malfunction
Cause
Remedy
Gripper actuator
does not
open/close
(1) No compressed air
(2) Incorrect pneumatic
connections
(1) Check compressed air
(2) Check pneumatic elements
End position sig-
nal not present
(1) Initiator incorrectly set in
relation to stop
(2) Initiator defective
(3) Broken cable
(1) Readjust initiator
(2) Replace initiator
(3) Replace initiator cable
Hard gripping of
workpiece
(1) Ventilation valve defective
(2) Stroke speed too high
(1) Change ventilation valve
(2) Set ventilation valve
Gripper cannot
grip part or loses
grip on part
(1) Workpiece mass too high
(2) Gripper jaws too long
(3) Design not optimum
(1) Use larger gripper actuator
(2) Move gripping point further
inwards
(3) Adapt design use physical lock
gripping
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