86 Agilent 1200 Preparative Pump User Manual
6 Troubleshooting and Diagnostics
Error Messages
Motor Maximum Power Fault
The motor control has determined that the set maximum for the motor power
was exceeded for longer than 1 second. To protect the circuitry from damage
this error event is issued in this case.
Blockages in the flowpath are usually detected by the pressure sensor in the
multi assembly, which results 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.
Motor Direction
The motor control has determined that the motor turns in opposite direction.
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.
Probable cause Suggested actions
1 Cables connected in wrong orientation after
a repair.
Ensure the cables are correctly connected (on
the main board and at the pump drive) and
reconnect with new orientation, if necessary.
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