At the same time, a static change of a feedback signal is delayed by the
attenuation period. This allows user-specific process sequences to be optimally
set.
For the reliable monitoring of the valve seat seal GEA Tuchenhagen
recommends the factory setting without signal attenuation. GEA Tuchenhagen
will not accept any liability for damage resulting from the use of signal
attenuation. The risk lies entirely with the operator of the facility.
Setting the LEFF Function
The LEFF function achieves steady pulsing (opening and closing) of the valve
disks during the typical lifting operation for cleaning the leakage cavity on
mixproof valves. For this purpose, solenoid valves Y2 and Y3 are actuated by the
PLC.
When the LEFF function is used on valve types D or B, a lifting stroke of 1.2 to
1.4 must be set in the lifting actuator; also refer to the operating instructions for
the mixproof valve types D and B.
LEFF activation
Off
Factory setting
Valve-disk and double-
disk
For mixproof valves with lifting actuator, solenoid
valves Y2 and Y3 and external proximity switch in
the lantern
Valve disk
For mixproof valves with lifting actuator and solenoid
valve Y2
Double-disk
For mixproof valves with lifting actuator and solenoid
valve Y3 and external proximity switch in the lantern
Semi-Automatic SETUP
In the event that SETUP should be required while a process is running that does
not allow activation of the relevant valve, a semi-automatic SETUP can be
performed.
This makes it possible after the replacement of a control top to automatically
detect and output the defined rest position of a process valve, whereas the end
position is only approached and detected by the next process step.
Only after detection of the rest and end positions are both valve states monitored
and the production process can be continued without any danger. If necessary,
parameters specific to valves may have to be set again in a subsequent standard
SETUP, see operating overview .
Operation and control
Settings in Programming Mode
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Summary of Contents for T.VIS A-15
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