3
Mounting and pneumatic installation
Festo – P.BE-CPX-CMAX-SYS-EN – en 2017-09b – English
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3.3.2
Drive, shock absorbers and fixed stops
Drive
Note
With all drives, follow the notes on mounting in the operating manual.
Use only permissible drives and drive-displacement encoder combinations with suitable guides
(
è
Tab. 3.1). Use other drives only after consultation with Festo.
Comply with stroke reduction in accordance with the catalogue specifications on every side of the
drive. Stroke reduction is 10 ... 35 mm per side – dependent on the drive
(
è
www.festo.com/catalogue).
Tip: The best positioning behaviour is achieved when only 80 % of the drive’s stroke length is used
and 10 % remains on each side as reserve.
In addition, for standard cylinders with end-position cushioning PPV:
Completely unscrew the adjustment screws for the end-position cushioning (PPV) on both sides.
Shock absorbers/fixed stops
Shock absorbers or fixed stops may be recommended, depending on the application and drive used.
These fulfil the following functions:
–
protection of the drive or displacement encoder
–
determination of the end positions
Note
Damage due to uncushioned travel into the end positions.
Carry out commissioning again if the fixed stops have been adjusted or components
and hoses have been replaced.
Recommendation: Use appropriate external stops, shock absorbers or fixed stops from Festo.
Information on mounting the shock absorbers and fixed stops from Festo
è
Operating
instructions for the drive or mounting instructions for the shock absorbers or fixed stops.
3.3.3
External displacement encoders
Note
If the positioning range of the drive is longer than the working stroke of the measuring
system:
Limit the positioning range by means of shock absorbers or stops so that the meas
uring system covers the complete possible positioning range. This protects the dis
placement encoder from damage.