Solenoid valve controller
4.4.5 Pressure Switch
The input 'pressure switch' serves for the mechanical check the valve function. The contact
must be closed before activating a valve (message: pressure exists). During the pause time, the
contact has to open (message: pressure drop = valve is open) and close again (pressure rise =
valve is closed). The jumper XS1 has to be charged in the position 'with pressure switch'.
4.4.6 Cleaning Cycle
The cleaning cycle can be selected with the jumper XS1(Cleaning cycle):
●
'Partial cycle' = Cleaning is effected as long as the start signal is active
●
'Total cycle' = Cleaning is always excecuted up to the last valve.
Note: Changes of the jumper configuration become effective after a restart of the device!
4.5 Pause Control
The control system is able to carry out a {P-dependent pause control. This function is
selected with the jumper XS1 'Regl'.
The operator selects an individual controller characteristic with the pause potentiometer. For
controlling, the current differential pressure must be signalled to the control system as an
analog signal. The signal can be made available either internally by the
P extension board
or externally as a 0(4)-20 mA signal at the terminals 17 + and 18 - (cf. also 'Start input').
The control system determines the current pause time from the current differential pressure
and the selected characteristic curve.
When the differential pressure increases, the pause time is shortened; when the differential
pressure decreases, the pause time is prolonged.
The variation of the pause time is not linear.
Cleaning is terminated when the differential pressure falls below approx. 5% of the measuring
range.
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