If the overall vibration level at a 20 kW motor is 5.1 mm/Srms, what is its operational condition according to ISO 10816-3?

To determine the operational condition of a 20 kW motor with an overall vibration level of 5.1 mm/s RMS according to ISO 10816-3, it's essential to understand the classification and thresholds set by this standard. ISO 10816-3 provides guidelines for evaluating the vibration cause of mechanical machines, where thresholds are categorized into different operational status levels.

In this case, the threshold for a 20 kW motor indicates that a vibration level in the range of 4.0 mm/s RMS to 6.3 mm/s RMS typically falls into the "Short-term operation allowable" category. This implies that while the vibration level is higher than ideal, it does not reach a point where urgent repair is necessary or immediate shutdown is warranted. The motor can continue to operate for a limited duration, allowing for monitoring and planning for maintenance without stopping the machinery immediately.

Therefore, the interpretation of the vibration level of 5.1 mm/s RMS aligns with the standards that classify this level as acceptable for short-term operation. The motor could be running under some duress but can operate without immediate concern, provided that monitoring is in place to ensure the situation does not deteriorate further.