Vacon · 20 Compact
This fault indicates that the current at an analogue input (configured for a 4-20mA range) is below 4mA, or the voltage at an analogue input (configured for a 2-10V range) is below 2V. This typically points to a broken or loose control cable or a failure of the signal source device.
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Check the entire current or voltage loop circuitry, including the signal source, control cables, and input terminals (e.g., AI1, AI2, GND) for proper connection and continuity.