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6.3.1. Start Compensation Learning
By entering this menu item, a pulsation compensation learning process starts. Before
initiation of pulsation compensation learning, pump
connects to column and starts pumping.
It
is ideal
to carry out the learning process under working conditions, including used tubing, column
etc. Learning process is trying to find optimal curve of pump rotation speed, so that pulsation
meets condition set in item
Menu/Preferences/Compensation/Pressure pulsation limit
, at least for
three consecutive revolutions. Learning process runs under constant flowrate (minimal flowrate is
0.06 ml/min). Learning process is shown by an icon on main screen (see
) and also a warning
with description, that learning is in process. If it is not possible to complete the process under
10 min., another warning is displayed, that learning process has not been completed in desired
time limit. Learning process can be stopped by pressing key
PUMP
, which stops pumping, or using
first item in
Menu/Control
/
, that changes to
Stop compens.learning
. In this case pumping does
not stop. After confirmation by pressing ENTER
Stop compens.learning
is displayed a question,
whether to save the best result. If the learning process is interrupted, it returns to last learned
compensation value. Under standard conditions the pump usually learns compensation within
5 min.
In menu item
Menu/Diagnostics/Puls
is displayed pulsation status and information about
values of parameters, under which compensation learning took place (see
). After setting
different flowrate, then flowrate used during learning process, with difference higher than
± 8.3 ml/min (1/6 from maximal flowrate) pulsation compensation turns off. The unit displays a
warning and a symbol is changed on main screen (see
).
Note:
When changing a column or mobile phase, we recommend to proceed the
pulsation compensation learning process again.
A
L
IST OF
W
ARNINGS AND
E
RRORS DURING
P
ROCESS AND AFTER
L
EARNING
P
ROCESS
Warnings
and
Errors
Description
Reason / Solution
W13
LEARNING IN PROGRESS! OPERATE
PUMP STEADILY.
Displays after learning process start.
W14
PRESSURE PULSATION OVER LIMIT!
Pumping continues in learned mode
of compensation. It indicates e.g.
unit aeration or leakage in flow
system. Check the unit according to
instructions in chapter
W21
LEARNING TIME EXCEEDED BASIC
PERIOD! AUTOMACALLY CONTINUES TO
PROLONGED PERIOD.
Learning process did not complete
within 5 min. It has been prolonged
to 10 min.
W24
PULSATION COMPENSATION WAS
SWITCHED OFF DUE TO ACTUAL FLOW
IS OUTSIDE LEARNED BOUNDS.
After setting flowrate in interval
± 8.3 ml/min of learned flowrate
compensation starts again
.
W25
LEARNING PROCEDURE WAS
RESTARTED DUE TO ACTUAL FLOW
CHANGE
.
New flowrate value has been set
during learning process.
W30
PUMP IS NOT LEARNED. COMPENSATION
IS SWITCHED OFF!
Proceed compensation learning
process.
E44
LEARNING DID NOT MEET PULSATION
Operating error. Pumping stops.
