DHTG
Festo – DHTG – 2018-02e English 13
– The maximum achievable cycle frequency as a factor of the moment of mass inertia can be read
in the diagram Cycle frequency. The minimum possible cycle time can be calculated from this
by T = 60/f.
The actual cycle time is then calculated as follows:
Cycle time = switching time + processing time + dwell time.
– The processing time results from the time which the relevant customer application requires
(e. g. time for removing components, press-in time, etc).
– Dwell time may be necessary if the actual cycle time is less than the minimum possible cycle
time (calculation example è Catalogue specifications).
Note that the viscosity of the shock absorber oil decreases with increasing heat. The shock ab
sorber might therefore strike through if the device is operated for too long a period. If necessary
reduce the moment of mass inertia.
Avoid the DHTG coming into contact with:
– Aggressive media
– Grinding dust
– Glowing sparks or chips.
These will damage the DHTG.
8 Maintenance and care
Switch off the power supplies:
– Operating voltage
– Compressed air supply.
Cleaning:
Only clean the DHTG using a soft cloth.
All non-abrasive cleaning agents are permitted.
Due to its service life lubrication the DHTG does not require any maintenance.
Regular removal of the lubricating grease on the surface of the piston rod will reduce the service
life.
After a conversion (e. g. to reciprocating operation) lubricate the following components
with LUB-E1:
– piston, piston chamber, seal, lock, toothed rod, pinion, table bearing, dividing disc.
We recommend the mechanical components are lubricated again after every 5 million switching
cycles.
Check the shock absorbers every 2 million strokes for:
– Oil leakage
– Hard knocking
– Function (shock absorber head must not remain in the retracted end position).
Dismantling the shock absorber (è Dismantling and repairs).
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