SCHUNK SWS Series - Fail-Safe Operation

Operation
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10.00 | SWS 005 – 300 | Assembly and Operating Manual | en | 389456
Ø As an option RTL (Ready-To-Lock) - Models SWS-076/110/160
sensing is built into the Tool Changer, providing the ability to
sense Tool proximity to theSWK prior to coupling. RTL signals
are not required to couple the Tool Changer, but are
recommended as a further confirmation of coupling prior to
removing the Tool from the tool stand.
Ø Verify that the RTL signals are read as “on” (true), if being utilized.
The locking mechanism must be in the Unlock state before
another attempt is made to couple or damage could occur to the
robot and/or the Tool Changer.
NOTICE
No-Touch™ locking technology allows the unit to couple with a
separation distance between the SWK and SWA.
Direct contact of the SWK and SWA mating surfaces is not
suggested or required just prior to coupling. Contact may result
in damage to the unit and/or the robot.
6.2 Fail-Safe Operation
A fail-safe condition occurs, when there is an unintended loss of air
pressure to the SWK. When air pressure is lost, the Tool Changer
relaxes and there may be a slight separation between the SWK and
the SWA. The lock sensor may indicate that the unit is not locked.
The fail-safe feature utilizes a multi-tapered cam to trap the ball
bearings and prevent unintended release of the SWA. Positional
accuracy of the tooling is not maintained during this fail-safe
condition. Do not operate the Tool Changer in the fail-safe
condition. If source air is lost to the unit, movement should be
halted until air pressure is restored.
After air pressure is re-established to the SWK, the locking
mechanism will energize and securely lock the SWK and the SWA
together. In some cases when to load on the Tool Changer is
significantly off center, it may be necessary to position the load
underneath the Tool Changer or return the tool to the tool storage
location to ensure a secure lock condition. If equipped, make sure
the lock sensor indicates the Tool Changer is in the locked position
before resuming normal operations. Consult your Control/Signal
Module manual for specific error recovery information.
CAUTION
Do not use the Tool Changer in a fail-safe condition.
Damage to the locking mechanism could occur.
• Re-establish air pressure and ensure the Tool Changer is in a
secure lock position before returning to normal operations.