Stroke Length - Agilent Technologies 1100 Series Service Manual

2 Troubleshooting and Test Functions

Stroke Length

Stroke Length: Pump channel A
B: Stroke Length: Pump channel B
The distance between the lower plunger position and the upper mechanical
stop is out of limits (nano pump).
During initialization, the nano pump monitors the drive current. If the plunger
reaches the upper mechanical stop position before expected, the motor
current increases as the nano pump attempts to drive the plunger beyond the
mechanical stop. This current increase causes the error message to be
generated.
Probable Causes
• Defective pump drive assembly.
Suggested Actions
62
Exchange the pump drive assembly.
1100 Series Nano Pump Service Manual