Wilo Tagus Vac Notice De Montage Et De Mise En Service page 24

English
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
A ctivation 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.
I n 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.
30
F illing off
11.2.3
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
Upper pressure limit
(operating pressure range)
Filling deactivation pressure
Filling activation pressure
Lower pressure limit
(operating pressure range)
WILO 07/2018