Agilent Technologies 1100 Series, Service Manual

Page: 69 / 288

1100 Series Nano Pump Service Manual 57
Troubleshooting and Test Functions 2
Servo Restart Failed
Servo Restart Failed: Pump channel A
B: Servo Restart Failed: Pump channel B
The pump motor in the nano pump was unable to move into the correct
position for restarting.
When the nano pump is switched on, the first step is to switch on the C phase
of the variable reluctance motor. The rotor should move to one of the C
positions. The C position is required for the servo to be able to take control of
the phase sequencing with the commutator. If the rotor is unable to move, or if
the C position cannot be reached, the error message is generated.
Probable Causes
• Disconnected or defective cables.
• Mechanical blockage of the nano pump.
• Defective pump drive assembly.
• Defective CSM board.
Suggested Actions
✔
Ensure the pump assembly cables are not damaged or dirty. Make sure the
cables are connected securely to the CSM board.
✔
Remove the pump-head assembly. Ensure there is no mechanical blockage
of the pump-head assembly or pump drive assembly.
✔
Exchange the pump drive assembly.
✔
Exchange the CSM board.