Agilent 1200 Preparative Pump User Manual 85
Troubleshooting and Diagnostics
6
Error Messages
Motor Drive Fault
The motor drive chip has issued a fault signal. The current drawn by the pump
motor exceeded the maximum limit or under voltage lockout.
Blockages in the flowpath are usually detected by the pressure sensor, which
result in the preparative pump switching OFF when the upper pressure limit
is exceeded. If a blockage occurs before the pressure sensor (i.e. the pressure
increase cannot be detected by the pressure sensor), the preparative pump
will continue to pump. As pressure increases, the pump drive draws more
current. When the current reaches the maximum limit, the preparative pump
is switched OFF, and the error message is generated.
Probable cause Suggested actions
1 Flow path blockage in front of the pressure
sensor.
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.
2 Blocked outlet ball valve. Exchange the outlet ball valve.
3 High friction (partial mechanical blockage) in
the drive assembly.
Remove the pump head assembly. Ensure there
is no mechanical blockage of the pump head
assembly or drive assembly.
4 Defective drive assembly. Exchange the drive assembly.
5 Defective PPM board. Exchange the PPM board.
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