GE AKTA avant User Manual page 400

8 Troubleshooting
8.6 Troubleshooting: Pumps
Problem
Pressure overshoot or
oscillating pressure
when pressure control
is active
Pressure overshoot or
oscillating pressure
when using constant
pressure flow
Examples of pump pressure
curves
The table below shows some examples of pump system pressure curves obtained when
errors have occurred. The examples can be useful in troubleshooting of the system
pumps and the sample pump. The system pressure monitor R9 has higher resolution
than the other pressure monitors, and is therefore recommended for troubleshooting
purposes.
Incident: 30 μl of air enters pump. One pump head is working normally, the other
fails to deliver buffer.
Action: Purge pump. See Section 5.4.1 Prime buffer inlets and purge system pumps,
on page166. If the problem is persistent, see Remove persistent air bubbles, on page403.
400
Possible cause and action
Too high I factor in the Pressure control parameters
•
instruction
In the Manual Instructions dialog box, decrease the
I factor of the Pressure control parameters instruc-
tion.
Too high I factor in the Constant pressure flow param-
•
eters instruction
In the Manual Instructions dialog box, decrease the
I factor of the Constant pressure flow parameters
instruction.
ÄKTA avant User Manual 29035184 AE