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Manual ENA 7-30
25
24
ENG
Appendix 2. Items of the hardware and parameter menu
2.1. Operating modes
The operator can operate the system in the fast and normal de-aeration mode. Service personnel have
also access to hand mode, and can carry out a leakage test. This leakage (vacuum) test can also be
used to test the ability to operate the pump.
2.1.1. Fast/Turbo
Pump running (with formation of a vacuum) takes place alternately with the evacuation interval until
the period of time selected for the fast mode expires. Then, the control automatically changes to
normal mode.
0
2
2
1
1
Pump
ON
OFF
Time
0
Start delay
1
Pump run
2
Deaeration time
2.1.2. Normal
The normal de-aeration mode is only automatically interrupted by a pause to avoid possible de-aeration
noise during the night.
0
Start delay
1
Pump run
2
Deaeration time
3 Pause
duration
2.1.3 .Hand
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.
0
2
3
1
1
Pump
ON
OFF
Time
2.2. Control modes
2.2.1. Level-controlled [%]
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.
2.2.2. Pressure-controlled [P]
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.
2.2.3. Filling off
The ENA 7-30 unit operates solely as an automatic de-aeration unit.
2.3. 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.
2.3.1. Make-up quantity (monitoring)
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 NFE1.2/2.2) is connected and activated, the operator can monitor a
maximum filling quantity per cycle instead of the maximum filling time per cycle.
