• Select one of the activation alternatives:
Alternative 1
Circuit diagram (activation with 5/3-way valve and 3/2-way valve)
Control sequence
Fig. 9
Alternative 2
Circuit diagram (activation only with 3/2-way valves)
Control sequence
Fig. 10
The intermediate position may only be travelled to (valve V2) if the semi-rotary
drive is simultaneously exhausted. This ensures that the flow control valves fulfil
their function and no accidental change in rotation angle takes place.
Fundamentally, an overswing may occur in the intermediate position. This can be
minimised through corresponding restriction of speeds (exhaust air flow control).
Alternative 3 (shortened swivel time in 180°-operation in a swivel direction)
Circuit diagram (activation with 5/3-way valve and 3/2-way valve)
Control sequence
Fig. 11
5.3 Carrying out commissioning
Warning
Danger of injury due to uncontrolled movement of the semi-rotary drive
(e.g. through extending dampener
1
).
• Consider that the pneumatic actuation of the semi-rotary drive can trigger a
movement in case of:
– eccentrically attached payload, due to the strong unbalance
– function variant Y9/Y12 due to the resetting force (back pressure) of the
shock absorber.
• When the intermediate position is exited, make sure that nobody/nothing is in
the movement area of the dampener.
• Start the test run at first with reduced operating pressure.
Note
Excessive loads can damage the DRRD-...-PS1.
• Make sure that the following values are not exceeded when swivelling into the
intermediate position:
– the maximum permissible mass moment of inertia (
7 Technical data) and
the maximum permissible swivel time of the intermediate-position module
DRRD-...-PS1 (
www.festo.com/catalogue).
• Make sure that the following values are not exceeded while swivelling into the
end position:
– the maximum permissible mass moment of inertia of the semi-rotary drive
DRRD.
For the swivel motion from the intermediate position into the end positions,
the respective values of the corresponding function variants of the semi-
rotary drive are permissible (
Technical data in the operating instructions
for the DRRD).
