BECKHOFF DK9222-1009-0006 - Manual (Page 3)

I/O
Bus Terminal
Application Note DK9222-1009-0006
Scenario 2
5 4 2 1 3
Scenario 2
Volume rate of flow
Pump
Start-up
phase
1 st cut Constant
cut
Exit Move-out
phase
Tool drive active
Cooling lubricant consumption
Energy consumption
Fig. 3 Fractional optimised control
Similar to the example above, the pump is linked logically to the tool drive. However, additionally, there is a valve to regulate
the flow rate for different load cases and to prevent pumping when the tool is driving in. Although the cooling lubricant
consumption is thus optimised, the pump is still running at 100 % utilisation, even though the flow rate is only minimal.
Furthermore, a dynamic pressure builds up at the valve due to the constantly running pump, so that when the valve is opened
the cooling lubricant shoots out before the normal pumping pressure has been established.
New Automation Technology Beckhoff 3
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