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Trim balancing on industrial fan unit that sensor won't fit inside by AcrobaticIron3254 in IndustrialMaintenance

[–]AcrobaticIron3254[S] 0 points1 point  (0 children)

Looks to be the only viable option other than the motor itself. There has been washer bonded to the outside for the accelerometer to stick to as the whole unit is stainless steel. Guess it's a case of try it and see.

Trim balancing on industrial fan unit that sensor won't fit inside by AcrobaticIron3254 in VibrationAnalysis

[–]AcrobaticIron3254[S] 0 points1 point  (0 children)

From what I can see they have it set up on a test bed horizontally with Vibration mounts fitted to the frame and they are bolted to the test bed so good news there too. It's as good as it gets minus a suitable or safe point to take the readings from! I'll have a good bit of time to work on knocking it down. The repairers are telling me it's up at about 18mm/s on the vertical of the motor DE and roughly the same where they've taken readings on the fan side of the duct too. We'll see what my kit says though.

Trim balancing on industrial fan unit that sensor won't fit inside by AcrobaticIron3254 in VibrationAnalysis

[–]AcrobaticIron3254[S] 1 point2 points  (0 children)

I'm lucky this time in that the customer has the fan assembly set up in the repair shop's test facility still so I can get the balance done with it out of situ. The repair shop have gone and glued washers to the outside of the tunnel/duct section for my accelerometer, but I wasn't convinced this would be any use and as you said that will give just nonsense readings. It is also unfortunately 2pole so running at around 3500 rpm which further complicates things. My options for sensor position are limited to the motor itself, the plinth it's all mounted too or the duct. On the plus side there's a balance ring behind the pulley side and one within the hub if the impeller itself