Detailed explanation:
1 - If
‘Airlock’
has been selected in the menu, the internal signal "Airlock"
triggers the bleed procedure.
If the signal appears again within 8 minutes of the bleed procedure
being carried out, the control unit repeats the bleed procedure up to a
maximum 3x. However if the signals still appear, then an error alert is
generated, which must be acknowledged via the
‘STOP/START’
key.
In the event of an
‘Airlock’
there is no option for a direct error or
warning alert upon receipt of the "Airlock" signal. Also the corre‐
sponding menu branch in the menu
‘METERING’
is hidden. The
signal is only available for the "Bleeding" function.
2 - If
‘Periodic’
was selected in the menu, then the control unit periodi‐
cally triggers the bleed procedure with the adjustable period (10 ...
1440 min = 24 h) and the adjustable duration (
‘Dose time’
: 0 ... 300 s
= 5 min).
Triggering always occurs at the start of a period. Triggering also
occurs if started using the
‘STOP/START’
key or a mains voltage is
applied arising from a bleed procedure. If under the menu the function
‘Upon pause’
, is set to
‘on’
, the bleed procedure also takes place
during pauses.
3 - If
‘Both’
has been selected in the menu, either the internal signal "Air‐
lock" or the control unit triggers the bleed procedure. If one trigger
occurs, while the other has already triggered a bleed procedure, this
results in two sequential bleed procedures.
1. The pump control stops the running normal metering operation - the
"Stop" symbol appears on the LCD screen.
2. After 1 s, it opens the bleed valve of the liquid end (via the bleed
relay and the solenoid valve).
3. 1 s later, the pump starts to run at its maximum possible stroke rate
(as during priming) - the symbol "Airlock" appears on the LCD
screen instead of the "Stop" symbol.
4. The pump runs in this way for the total set time.
5. Once the set time has elapsed, the pump stops, the symbol "Stop"
appears on the LCD screen again.
6. After 1 s the pump control closes the liquid end bleed valve.
7. After 1 s the "Stop" symbol disappears and the pump recommences
normal operation.
If the pump was in the "Stop" state upon triggering (Key
‘STOP/START’
,
pause, error), the start of the bleed procedure is delayed - until this state is
cleared.
If the pump is placed in the "Stop" state during the bleed procedure, the
pump control jumps immediately to phases 5 and 6. (see above) This defi‐
nitely cancels the bleed procedure. As soon as the "Stop" state is cleared,
the bleed procedure starts from the beginning.
Sequence of the bleed procedure (auto‐
matic):
Set up
64
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