Solenoid valve controller
4.4 Functions
4.4.1 Release/Stop
The input releases activation of the valves. If the contact is open, cleaning is stopped immediately.
4.4.2 Start /
∆
p-IN
The control system can operate in 2 operating modes. They are selected with the jumper 'XS1
Type of cleaning'.
1. Switching threshold: Cleaning is effected as long as a switching contact is closed,
e. g. between the upper and the lower threshold of a
P controller.
2. Control: Cleaning is effected permanently with variable pause times.
cf. pause control
Note: Changes of the jumper configuration become effective after a restart of the device!
The (analog) input signal for cleaning can be connected externally or signalised internally by the
p extension board.
internal signal: “Threshold” for type of cleaning (XS1) “Threshold”
“Control” for type of cleaning (XS1) “Pause control”
external signal: A 0(4)-20 mA signal is required for controlling.
In order to serve as a 'switching threshold', the signal must be switched
between 0(4) mA and > 20 mA. Terminal 16 can be used as source of
current for a switching contact.
The current output of a PLC can be used as an external signal.
The current output must be connected to terminal 17 + and terminal
18 - (GND).
It is possible to work with an external and an internal signal simultaneously. The higher signal then
has priority. This allows the cleaning to be started in special operating situations, even if the set
thresholds have not been exceeded (e. g. for time-controlled forced cleaning).
4.4.3 Post-cleaning
1. Starts if differential pressure falls under threshold with is adjusted at the potentiometer
'Post-cleaning Start'. The number of complete cleaning cycles can be adjusted with the
potentiometer 'Cyles'. (Jumper XS1=Schw). Pulse- and pause time as adjusted.
2. Impulse signal at the input 'Post-cleaning' (18,20) triggers the post-cleaning process. Pulse-
and pause time as adjusted.
If the function ‘pause control’ (XS1 'Regl') is selected, post-cleaning is effected with a fixed pause
time of 30 sec.
Note: Changes of the jumper configuration become effective after a restart of the device!
4.4.4 Malfunction acknowledgement
A signal at the input 'malfunction acknowledgement' resets a valve error message (LED and
malfunction relay). When the cause of error has been eliminated, the error message is automati-
cally removed. (The condition of a valve is recognized with the next excitation).
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