Burkert Type 8605 - Manual (Page 28)

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Configuration
Figure 21: dELY (Delay) - Ramp function
9.3.6. Cut (Cut off) - Zero point cut off
In order to guarantee leak-tight closing of the valve, the valve is completely de-energised with input signals below
the set limit (0.1 to 5.0 % of the set standard signal) when the zero point shutdown is active.
In addition to its control function, the valve can also take on the function of a cut-off valve.
Figure 22: Cut (Cut off) - Zero point cut off
• With a set value of 0.0 %, the zero point cut-off is deactivated. Even at an input signal of 0 %, the valve
no longer reliably shuts off the flow.
• The valve flow control restarts with a hysteresis of 0.5 %.
• The reactivation of the current controls starts as soon as the input signal is set to a value 0.5 % above
the defined threshold value; i. e. there is a hysteresis of 0.5 % for the activation and deactivation of the
cut off function
• The range of the input signal lying below the set threshold is no longer available for the current control
and fluidic flow control
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Type 8605