Motor Belt Fault Detected in Air Handling Unit Motor

Motor belt fault detected by online monitoring and remote analysis of an air handling unit motor

Motor Belt Fault Detected in Air Handling Unit Motor

Air Handling Unit

Inspection description:
Vibration analysis inspection of Motor Drive

Frequency of inspection:
Continuous 24/7 Online Monitoring and Remote Analysis

Equipment description:
Motor – Belt – Fan running 15/7

Vibration reading (Velocity Spectrum) from the Motor Drive End 31-01-2016: 5.2mm/s

Image 1

This spectrum indicates the normal operating vibration baseline of the Motor Drive End. The peak indicates the motor run speed.   

Vibration trend (Velocity Route Mean Squared) from the Motor Drive End Bearing recorded in January 2016 to April 2016

Image 2

This trend indicates the normal operating vibration baseline from the Motor Drive End. 

 

Vibration trend (Velocity Route Mean Squared) from the Motor Drive End Bearing recorded in 08-02-2016 to 12-02-2016

Image 3

This trend indicates the normal operating vibration baseline over a few days from the Motor Drive End, showing the machine running and not running conditions. It illustrates the detailed data trends that can be created using 24/7 monitoring.  

Vibration reading (Velocity Spectrum) from the Motor Drive End 19-05-2016 7.1 mm/s

Image 4

This spectrum shows the vibration at the running speed has increased in the Motor Drive End.  

Vibration reading (Velocity Spectrum) from the Motor Drive End 17-06-2016 7.6mm/s

Image 5

This spectrum indicates the vibration at the running speed has continued to increase in the Motor Drive End.  

Vibration trend (Velocity Route Mean Squared) from the Motor Drive End Bearing recorded in January 2016 to June 2016

Image 6

On the 17-06-16 and 18-06-16 the velocity level breached the warning notification threshold set on the machine. The online system raised warning notification emails and analysis was carried on the machine.  

Fault detection and action

Fault detected
Deterioration detected at the Motor Drive End, related to motor belt.

Action
The online system raised a warning notification. Remote analysis determined a medium level issue had been detected. A report was issued to site personnel.

Recommended Action
Visually inspect motor and belt.

Action:
On visual inspection of the belt the site personnel determined it to be worn and deteriorating. Repair works were carried out on 28-06-2016 and the belt was replaced. 

Vibration reading (Velocity Spectrum) from the Motor Drive End recorded 08-07-2016 3.69mm/s

Image 7

The spectrum indicates the running speed frequency vibration is no longer present in the Motor Drive End after the belt was replaced. A velocity vibration decrease of 49% from the levels on the 17-06-2016.    

Summary Vibration trend (Velocity Route Mean Squared) from the Motor Drive Bearing recorded between January 2016 to September 2016

Image 8

This RMS trend indicates the before and after the belt was replaced vibration levels of Motor Drive End between January 2016 and September 2016.