1100 Series Nano Pump Service Manual 59
Troubleshooting and Test Functions 2
Index Limit
Index Limit: Pump channel A
B: Index Limit: Pump channel B
The time required by the plunger to reach the encoder index position was too
short (nano pump).
During initialization, the first plunger is moved to the mechanical stop. After
reaching the mechanical stop, the plunger reverses direction until the encoder
index position is reached. If the index position is reached too fast, the error
message is generated.
Probable Causes
• Irregular or sticking drive movement.
• Defective pump drive assembly.
Suggested Actions
✔ Remove the pump head, and examine the seals, plungers, and internal
components for signs of wear, contamination or damage. Exchange
components as required.
✔ Exchange the pump drive assembly.
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