What is the ERR 9 alarm of Danfoss inverter?

1, motor overload: too short acceleration time and too large load fluctuation will cause alarm.

2. Overload of 2.AL9 frequency converter: when the internal electronic overload relay reaches 98%, it will alarm when it reaches 100%, and it can be reset when it stops below 90%.

Check whether some Hall sensors are normal. When testing ceramic-based thin film integrated resistor r50 1, one of them became infinite due to corrosion, which led to poor grounding, thus generating strong signals and alarms. The original part was not replaced, and a high-power patch resistor with the same resistance was welded on it, and it worked normally after restart.

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Precautions:

1, inverter is a high-power electronic component, which is easily affected by working temperature. The product is generally required to be at 0 ~ 55℃, but in order to ensure the safety and reliability of the work, we should consider leaving room when using it, and it is best to control it below 40℃. In the control box, the frequency converter should generally be installed at the upper part of the box, and the installation requirements in the product manual should be strictly observed. It is absolutely not allowed to install heating elements or easily heating elements near the bottom of the frequency converter.

2. When the temperature is too high and the temperature changes greatly, condensation will easily occur inside the inverter, which will greatly reduce its insulation performance and may even lead to short circuit accidents. If necessary, desiccant and heater must be added to the box.

3. When the control cabinet equipped with frequency converter is subjected to mechanical vibration and impact, it will cause poor electrical contact. At this time, in addition to improving the mechanical strength of the control cabinet and keeping away from vibration sources and impact sources, anti-seismic rubber pads should also be used to fix the electromagnetic switches and other components that generate vibration outside and inside the control cabinet. After the equipment has been running for a period of time, it should be inspected and maintained.

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