Loss of VIA Analog Signal

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This fault is triggered when the analog input signal at the VIA terminal drops below the detection level configured by parameter F633 and persists for 300 milliseconds or longer. It indicates a problem with the external analog signal source, its wiring, or the drive's input circuit. Loss of a critical control signal can lead to incorrect motor operation, uncontrolled speed, or system shutdown, posing a risk of process disruption, equipment damage, or safety hazards.

• Broken wire or loose connection in the analog input signal cable connected to the drive's VIA terminal.
• External sensor or transducer failure (e.g., pressure transmitter, potentiometer) that provides the analog signal to the drive.
• Loss of power supply to the external sensor (e.g., 24VDC power supply failure or open circuit).
• Misconfiguration of analog input parameters (e.g., F633 set too high, F630 for input source, F631 for signal type).
• Electromagnetic compatibility (EMC) interference causing temporary signal corruption or dropout below the detection threshold.

Klikk på steg for å spore fremgangen.

1. 1

   Measure the voltage or current directly at the VIA and COM terminals on the drive with a multimeter, verifying it meets the expected signal range (e.g., 0-10V, 4-20mA).

2. 2

   Verify the external sensor's output directly at its terminals using a multimeter to confirm it is producing the expected analog signal.

3. 3

   Check the power supply for the external sensor (e.g., 24VDC) at its input terminals to ensure it is within specified limits.

4. 4

   Inspect the analog signal cable for physical damage, shorts, or opens, especially at connection points to the sensor and the drive's VIA terminal.

5. 5

   Adjust the Analog input detection level (F633) down to a value slightly above 0V or 0mA if the signal is known to occasionally drop to a low, but valid, level.

6. 6

   Ensure proper shielding and grounding of the analog signal cable, connecting the shield to the drive's frame ground (FG) if applicable, to mitigate EMC noise.