Rotor damage and side-bands? 1

[Skogsgurra]

Hi,

I'm sitting with this paper machine drive. AC drives. Unruly speed, nothing wrong with drive. Mechies say nothing wrong with machine.

Had a look at motor current. Heavy side-bands (about 15 percent of fundamental). Checked other motors with same load. Side-bands below 1 percent.

Question: Shall I tell them to stop the machine and change motor? Do you think that 15 percent side-bands is a strong enough indication for rotor problems. I will hang if I stop the machine, change motor (250 kW) and it doesn't help. HELP!!

Gunnar Englund

http://www.gke.org

 

[Skogsgurra]

Good. May need to go there once again. Machine is still producing.

Wonder why I didn't do that measurement in the first place? :~/



Gunnar Englund

http://www.gke.org