Burkert Type 8611 - Manual (Page 80)

80
FunctionsoftheConfigurationLevel
display
INV description
NO Not inverted or direct control (the process value increases with the opening of the valve)
YES Inverted control (the process value decreases with the opening of the valve)
Figure 57: Display INV
12.13.9. ZERO – zero point shut-off
The zero point shut-off can be activated or deactivated. When the zero point shut-off is activated it is ensured
that the valves close securely.
display
ZERO description
NO No zero point shut-off. The control is continuous up to the lower limit value of the value
range defined in
SETP-EXT (see chapter 12.5) or up to the lower limit of the range
defined in VALV-MIN (see chapter 12.17). The greater one of the two values is relevant
YES Zero point shut-off is active. The control is continuous until the set-point value < 2% of
the upper value range of
SETP-EXT has been reached.
If the 2% limit is not reached, all valve outputs are disconnected from the voltage
supply. When valves are controlled with 0 - 10 V or 4 - 20 mA, the control signal is set
to 0 V or 4 mA.
Figure 58: Display ZERO
12.13.10. STRT – start value for active control
A start value can be defined for continuous actuating elements; this start value is approached immediately by the
actuating element when the control is started.
If the working point of the control valve is known, this can be set as start value. The working point of the valve is
then controlled very quickly. Depending on the selected actuating element, the following selection options are
available:
selected actuating element value range
Solenoid control valve ( SCV), open/closed valve (2P - T, 3P - T) 0 % - 100 %
Control valve with 0 - 10 V control ( 0 – 10) 0 V – 10 V
Control valve with 4 - 20 mA control (4 – 20) 4 mA – 20 mA
Figure 59: Start value setting
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Type 8611