The current display on the ABB inverter panel is higher than the actual current of the motor!
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There is an ACS510-15KW inverter paired with a 3KW motor; the current display on the panel shows 9A, while the actual motor load current is 5.8A. The issue persists even after replacing the main control board and the Hall element. When measuring the voltage at each pin of the cable under static conditions, all values are normal. I would like to ask experts: which signal is responsible for the current display on the inverter?
The current display signal of an inverter generally comes from an internal current detection module, such as a Hall sensor. You’ve already replaced the main control board and the Hall sensor, but the problem still persists. The following aspects can be considered for inspection: 1. Verify and calibrate the current detection circuit to ensure that the current sensors (such as Hall sensors) are installed correctly and their parameters are set accurately. 2. Check the parameter settings of the inverter to ensure they match the actual parameters of the motor, such as the motor’s rated current. 3. Measure and determine whether there are any poor connections or high wiring losses in the connection between the inverter and the motor. 4. Check whether external interference is affecting the accuracy of current detection. 5. If the above steps fail to resolve the issue, it is recommended to contact ABB Technical Support for further assistance. I hope these suggestions can help solve your problem. .
Was it measured with a clamp ammeter? If so, a clamp meter capable of measuring the true RMS value is required for accurate measurements
Your error can be considered from three aspects. First, what is the operating frequency of the current? Verify whether the current value indicated by the inverter matches that shown by the clamp meter at the standard operating frequency of 50Hz; you can also check whether the values displayed on the inverter’s settings are correct and whether the readings from the clamp meter are accurate. Second, consider whether your clamp meter has a true RMS function? This feature ensures that the clamp meter is capable of measuring current at frequencies other than the power frequency. Thirdly, regarding the location of measurement: when measuring the motor current of an inverter, it is possible to choose to measure at the inverter’s input terminal; this allows for the measurement of current and voltage under power-frequency conditions. When the inverter is operating in frequency conversion mode, the current is not at the power frequency, and the voltage is also distorted. It is meaningless to measure current alone, and it is also not convenient for comparing the power values displayed by the inverter itself. Please also take the above suggestions into consideration
1. Can a clamp meter measure current in various frequency ranges? Ordinary clamp meters produce errors when measuring the output current of inverters, especially at frequencies below 50Hz, unless the clamp meter has this functionality. 2. If possible, run the frequency of the inverter at 50Hz before testing to see what the error is.