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Hand
11.1.3
The hand mode is intended exclusively for
maintenance purposes, i.e. for checking the
operation of the pump and of the solenoid
valve. The plant operator cannot access this
mode.
• Vacuum test
Activation of this mode first causes the
system port (at outlet of the system
return line) to be closed. The pump then
generates a vacuum within 5 seconds. This
vacuum must be maintained for about 100
seconds to allow the user to determine
that the tank is tight, following which the
test is successfully completed. This test is
normally carried out prior to commissioning
of the system and after maintenance of the
system.
11.2 Control modes
Level-controlled (%)
11.2.1
Control takes place via an external floating
signal or a non-floating signal (230 V).
It depends on the used pressureholding
control and whether a pump-controlled or
compressor-controlled diaphragm expansion
vessel is used. When the signal is applied,
the pump switches on. The filling operation
takes place until the level set on the control
of the expansion vessel is reached.
11.2.2 Level-controlled (%)
Control takes place via the pressure sensor
that is integrated in the module. When
the system pressure has dropped to the
activation pressure 'Fill command on', the
pump switches on and operates until 'Fill
command off' is reached.
In both control modes, the running time and
filling quantities (if the system is equipped
with a pulse water meter) are monitored. In
addition to this, the pressure in the system
is monitored. If the system pressure falls or
rises beyond the working pressure range, an
error message appears. The system activates
degassing and filling until the pressure is
back in the working range.
Filling off
11.2.3
52
The Tagus Vac 7-30 unit operates solely as
an automatic de-aeration unit.
11.3 Monitoring
It is the primary purpose of the monitoring
functions to detect errors in the system at
an early point of time and to protect the
system components to the largest possible
extent by means of appropriate signals or by
automatically shutting down the system. They
are particularly intended for detecting leakages
at an early stage and to limit leakages.
Make-up quantity (monitoring)
11.3.1
The operator can freely parameterise
the make-up quantity. If the conditions
described below are not satisfied, the
system will indicate an error; the floating
error contact will be opened until the error is
manually acknowledged.
• The actual run time must not exceed a
maximum time per cycle.
• The minimum interval between two cycles
(pause) must not be shorter than the time
programmed.
• The maximum number of cycles per time
window must not exceed the number
programmed in the run time window (e.g.,
not more than 3 cycles in the last 8 hours.)
If a litres counter (IWZ in Top-Up Unit 1.2/2.2)
is connected and activated, the operator can
monitor a maximum filling quantity per cycle
instead of the maximum filling time per cycle.
Pressure monitoring
11.3.2
The maximum allowable pressure and level
should not be exceeded. Therefore, pressure
deviations are signalled.
Pressure
Fill command OFF
Fill command ON
0 bar
• pMIN and pMAX are set on the working pressure
Upper pressure limit
(operating pressure range)
Filling deactivation pressure
Filling activation pressure
Lower pressure limit
(operating pressure range)
03/2024
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