Analog Input Fault

What does Analog input fault mean?

A voltage (or current) has been input to terminal 4 when the setting in Pr. 267 Terminal 4 input selection and the physical voltage/current input switch on the inverter are mismatched. This incorrect input configuration can lead to erroneous frequency commands, unstable operation, or potentially damage the analog input circuit if not corrected.

• Physical switch on the inverter's control board for terminal 4 (voltage/current selection) is set incorrectly.
• Pr. 267 (Terminal 4 input selection) parameter does not match the desired input signal type (e.g., 0-10V vs. 4-20mA).
• Incorrect wiring to terminal 4; e.g., current source connected when configured for voltage input or vice-versa.
• Input signal exceeds the configured range (e.g., >10V when set for 0-10V, or >20mA when set for 4-20mA).
• Loose connection at terminal 4 or terminal 5 (common) causing an intermittent signal loss or distortion.

Click steps to track your progress.

1. 1

   Power OFF the inverter, verify the physical voltage/current selection switch for terminal 4 on the control board matches the intended signal type.

2. 2

   Check Pr. 267 (Terminal 4 input selection) and adjust it to match the physical switch setting and the connected sensor output.

3. 3

   Measure the input signal voltage (0-10VDC) or current (4-20mA) at terminals 4 and 5 (common) using a multimeter.

4. 4

   Inspect the wiring to terminals 4 and 5 for proper polarity, secure connections, and absence of shorts.

5. 5

   Disconnect the external signal source and measure the resistance between terminals 4 and 5 to check for internal input impedance issues (rare).