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Troubleshooting and Test Functions
Index Limit
Index Limit
The time required by the plunger to reach the encoder index position was too
short (quaternary 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.