GE AKTA avant User Manual page 399

Problem
High pressure alarm
High pressure alarm
when pressure control
is activated
Abnormal difference in
system pressure com-
pared to pre column
pressure
Internal pump error
combined with high
pressure
Internal pump error at
normal pressure
Too slow pressure build
up when pressure con-
trol is active
Too slow pressure build
up when using con-
stant pressure flow
ÄKTA avant User Manual 29035184 AE
Possible cause and action
The pressure has increased due to increased viscos-
•
ity
The viscosity increases in cold room. Lower the flow
when performing runs in a cold room.
The parameter selected for pressure control is not
•
the most appropriate one
The pressure control is based on either the Pre column
pressure or the Delta column pressure. To change the
parameter for pressure control, select Pre column
pressure or Delta column pressure from the Pressure
control drop-down list in the Instruction box of the
instruction of interest.
The flow is too high
•
Lower the flow.
Clogged inline filter
•
Replace the inline filter, see Section 7.3.2 Replace the
inline filter, on page 275.
The flow path is blocked
•
Remove obstructions in the flow path. For example,
remove stop plugs and replace constricted tubing.
Blocked pump restrictor
•
Contact Service.
Too low I factor in the Pressure control parameters
•
instruction
In the Manual Instructions dialog box, increase the I
factor of the Pressure control parameters instruction.
Too low I factor in the Constant pressure flow param-
•
eters instruction
In the Manual Instructions dialog box, increase the I
factor of the Constant pressure flow parameters in-
struction.
8 Troubleshooting
8.6 Troubleshooting: Pumps
399