Cascading overload

What does 65317 mean?

This warning occurs in a pump or fan cascade function when the maximum frequency, set in 0x2916 (P211.00), has been reached and no additional free pump is available to share the load. This indicates the system is running at its capacity limits or beyond.

• Total flow/pressure demand from the cascade system exceeds the combined capacity of all available pumps/fans.
• The maximum frequency limit (P211.00) is set too low, preventing the lead pump from operating at full speed to meet demand.
• One or more pumps/fans in the cascade are faulty or offline, reducing the available capacity of the system.
• Incorrect sizing of individual pumps/fans for the application, leading to frequent overloads when demand is high.
• Sensor malfunction (e.g., pressure transducer, flow meter) providing inaccurate feedback, leading the cascade controller to demand excessive output.

Click steps to track your progress.

1. 1

   Verify the actual system demand (e.g., pressure, flow) against the designed capacity of the cascade system.

2. 2

   If appropriate for the application, increase the maximum frequency limit (P211.00) to allow the lead pump to operate at full speed.

3. 3

   Inspect all pumps/fans in the cascade for operational faults or offline status. Rectify any identified issues.

4. 4

   Review the sizing of the individual pumps/fans relative to the application's peak demand. Consider adding another pump if feasible.

5. 5

   Calibrate and verify the accuracy of the feedback sensor (e.g., 4-20mA signal at terminal AI1) used by the cascade controller.