AI supervision

What does 80A0 mean?

An analog input signal is outside the limits specified for that input (under minimum or above maximum). This indicates a problem with the sensor, wiring, or the signal source itself. Incorrect analog input can lead to incorrect process control or drive operation.

• Sensor supplying the analog input (e.g., pressure transducer, temperature sensor) has failed or lost its power supply (e.g., 24VDC).
• Broken wire or loose connection in the analog signal path to the drive's analog input terminal (e.g., AI1 or AI2).
• Incorrect scaling or range settings for the analog input parameter (e.g., P4-10 'AI1 min value', P4-11 'AI1 max value') for the expected sensor range.
• Signal source (e.g., PLC analog output, another controller) is sending an out-of-range value due to its own fault.
• Short circuit in the analog input wiring, causing an erroneously high current/voltage signal.

Click steps to track your progress.

1. 1

   Identify which analog input (e.g., AI1) is triggering the fault and its associated sensor (via parameters P4-01 'AI1 function', P4-02 'AI2 function').

2. 2

   Measure the analog signal (e.g., 4-20mA current or 0-10V voltage) directly at the drive's input terminals (e.g., AI1, AGND) using a multimeter.

3. 3

   Verify the power supply (e.g., 24VDC) to the external sensor at its connection terminals.

4. 4

   Check the drive's analog input parameters (e.g., P4-10: AI1 min value, P4-11: AI1 max value) to ensure they match the connected sensor's output range.

5. 5

   Inspect the analog input wiring for breaks, shorts, or loose connections, paying close attention to shielding and grounding.

6. 6

   Temporarily disconnect the sensor and inject a known good analog signal (e.g., 12mA from a signal generator) into the drive's analog input to test the drive's input circuit.