What condition does an overall vibration level of 2.4 mm/Srms indicate for a 400 kW motor according to ISO 10816-3?

An overall vibration level of 2.4 mm/Srms for a 400 kW motor falls within the acceptable limits according to ISO 10816-3, indicating that unlimited long-term operation is allowable. This standard provides guidelines for evaluating the vibration performance of machines and places machinery vibration levels into specific zones that dictate operational responses.

Vibration levels measured in mm/Srms reflect the severity of vibration; lower values are associated with better condition. The acceptable threshold for machines like a 400 kW motor is typically outlined in the standard, which identifies vibration levels below a certain point (often below approximately 4.5 mm/Srms for this category) as safe for continuous operation without the need for immediate corrective action or monitoring interventions.

Therefore, since 2.4 mm/Srms is well within the recommended limits for the category of this motor, it confirms that the motor can continue to operate without restrictions, hence allowing for unlimited long-term operation.