84 Agilent 1200 Preparative Pump User Manual
6 Troubleshooting and Diagnostics
Error Messages
Wrong Data from Pressure Sensor
The pressure sensor delivers readings within the range of -5 to -25 bar.
Motor Drive Temperature too High
The temperature of the motor-drive circuits is too high.
The processor continually monitors the temperature of the drive circuits on
the PPM board. If excessive current is being drawn for long periods, the
temperature of the circuits increase. If the temperature exceeds the upper
limit of 95 °C, the error message is generated.
Probable cause Suggested actions
1 Defective pressure sensor. Exchange the pressure sensor.
2 Defective PPM board. Exchange the PPM board.
Probable cause Suggested actions
1 High friction (partial mechanical blockage) in
the pump drive assembly.
Remove the pump head assembly. Ensure there
is no mechanical blockage of the pump head
assembly or pump drive assembly.
2 Partial blockage of the flowpath in front of
the pressure sensor.
• Ensure the outlet valve is not blocked.
• Ensure the capillaries and frits between the
pump head and pressure sensor (at the rear
of the multi assembly) are free from
blockage. Clean the filters in the multi
assembly.
3 Defective drive assembly. Exchange defective drive assembly.
4 Defective PPM board. Exchange the PPM board.
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