Calpeda
Unstable Control Signal / Sensor Feedback Issue
Pump speed fluctuates up and down without user input on variable-speed model
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Noisy or failing pressure sensor feeding Calpeda VFD, Loose sensor wiring, Incorrect PID settings in Calpeda controller, Air in system causing pressure oscillations
How to Fix / Troubleshooting
Safety first: Turn off power before working on sensors or wiring.
- Monitor sensor readings: View the live pressure or flow reading on the Calpeda controller. Rapid fluctuations indicate sensor or hydraulic instability.
- Bleed air: Open air bleed valves on filters and high points to remove trapped air that can cause pressure swings.
- Inspect sensor and wiring: Check the pressure sensor for leaks or damage and ensure its cable is intact and firmly connected. Replace the sensor if readings are erratic.
- Adjust control parameters: In the controller menu, reduce the PID gain or increase damping according to Calpeda guidelines to smooth speed changes.
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Repair Difficulty
Medium
3/5
Required Part
Calpeda pressure sensor and controller PID settings
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