Festo DHTG - Manual (Page 28)

DHTG
28 Festo – DHTG – 1404d English
6 Commissioning
Warning
Risk of injury from rotating masses.
• Make sure nobody can place his/her hand in
the positioning range of the DHTG and that
no objects lie in its path (e. g. by providing a
protective screen).
Note
Incorrect functioning due to inaccurate toothed rod position. When the DHTG is
exhausted, the resetting force of the shock absorber can push the rotary table out of
the end position and into an undefined position.
• Before each commissioning procedure, pressurise the last pressurised connection:
– Connection (B) for clockwise/anti-clockwise rotation
– Connection (C) or (D) for reciprocating operation/flexible control.
Note
Clockwise rotation is controlled internally through the flow control valve aJ.
Anti-clockwise rotation / reciprocating operation must be controlled externally through
an additional one-way flow control valve GRLA ( www.festo.com/catalogue).
• Screw the flow control screw aJ:
– in completely,
– then loosen one rotation
• Slowly pressurise the complete system with at least 4 bar.
• Start a test run Tab. 10.
• Check in a test run at low pulse frequency whether the following
modifications are necessary:
– Readjustment of the proximity switches
– Increase the speed step-by-step by unscrewing the
flow-control screw aJ
– Set the cushioning.
(D) (A) (B) (C)
aJ
Fig. 10
Direction of rotation of plate
Clockwise/anti-clockwise rotation Reciprocating operation/flexible control
1)
Basic position: Connection (B) pressurised see examples Tab. 11 to Tab. 13
1. Slowly pressurise connection (A)
2. Provide clock pulses for the valve
1) Internal flow control in one direction only (if necessary throttle different direction externally)
Tab. 10
Fig. 9