Paper Cutter...

[Eduardo Maun]

We have a paper cutter here and when we start the equipment there's a loud noise.When the equipment runs the noise will disappear. What is the reason for that noise? How can I troubleshoot the equipment to remove the noise?

Thank you!!!

God Bless?

Eduardo

 

[hillbilly]

You need to give more information.

Where is the noise coming from?

Are there any V-belt drives on any of the motors?

steve

 

[LarryFine]

Could it be conductor slap in the conduit, like elevators are known to have?

 

[realolman]

We have a paper cutter here and when we start the equipment there's a loud noise.When the equipment runs the noise will disappear. What is the reason for that noise? How can I troubleshoot the equipment to remove the noise?

Thank you!!!

God Bless…

Eduardo

The mechanic who didn't apply lock out tag out, maybe:smile: ... sorry... but I felt compelled.

Seriously, though... is this a desktop paper shredder or a giant industrial machine cutting rolls of paper... you're gonna have to explain it a little bettter.

 

[Eduardo Maun]

Ppaper Cutter!!!

Ppaper Cutter!!!

Yes!!! this is big industrial machine cutting rolls of paper. I believe the noise comes from the blade(s), when we start the equipment the blade goes up and down then we hear a loud noise. I told the engineer posible because of inrush current. I read an article about inrush current control circuit, it can filter out current spikes and noise posible the equipment does not have in rush current control circuit, But the engineer told me it might be on "electrical set up". I don't know what does he mean by electrical set up. Well I can also say that!!! but I want to know what is the real reason why there's a loud noise.

There's a frequency converter and a step down transformer.We have a 50Hz,415/240 V 3 phase system the equipment is rated 60Hz,120V, 3 phase. Does the frequency/step down transformer has to do with the noise? I guess this is what he means!!!


Hope this information will help!!!

Eduardo

 

[hillbilly]

What exactly does this noise sound like?

steve

 

[jim dungar]

There's a frequency converter and a step down transformer.We have a 50Hz,415/240 V 3 phase system the equipment is rated 60Hz,120V, 3 phase. Does the frequency/step down transformer has to do with the noise? I guess this is what he means!!!

What type of frequency convert do you have? A transformer can change voltage but it cannot change frequency. One of the most common frequency conversion systems is an variable frequency drive (VFD). If you are using a VFD you will not have an inrush current problem. However if you do not have a VFD then you may be trying to start the blades too fast causing the belts to slip in which case you may need to add some type of soft-start device.

What is the equipment really rated? 120V three phase is not a common voltage.

The article you read about control circuits and filtering out inrush current probably was dealling with electrical magnetic interference (EMI) noise and not anything you could hear.

 

[muskiedog]

How old is the unit? I used to operate a few different ones for a printing firm. They all made noise until up to speed.

 

[Eduardo Maun]

Paper Cutter!!!

Paper Cutter!!!

The equipment is about 5 years! here is the electrical set up the line system we have is 3 phase, 4w, 50Hz, 415/240V, it has a wye/delta starter, the frequency converter is 3 phase,4w, 60Hz, 208/110 V and the equipment is rated 60Hz, 120V, 3 phase, I even ask the engineer to verify the equipment specification(s). it is not a VFD. like rattling sounds coming from a brake.


Thank you!!!

 

[Pierre C Belarge]

The equipment is about 5 years! here is the electrical set up the line system we have is 3 phase, 4w, 50Hz, 415/240V, it has a wye/delta starter, the frequency converter is 3 phase,4w, 60Hz, 208/110 V and the equipment is rated 60Hz, 120V, 3 phase, I even ask the engineer to verify the equipment specification(s). it is not a VFD. like rattling sounds coming from a brake.


Thank you!!!

Has maintenance been performed on this equipment? In those types of environments, there is a lot of fibers (from the paper) and other environmental concerns that could be causing the equipment to start making those noises, it may not be electrical in nature, but mechanical. This is all assuming that the noise you mention has just started recently.

 

[jim dungar]

The equipment is about 5 years! here is the electrical set up the line system we have is 3 phase, 4w, 50Hz, 415/240V, it has a wye/delta starter, the frequency converter is 3 phase,4w, 60Hz, 208/110 V and the equipment is rated 60Hz, 120V, 3 phase, I even ask the engineer to verify the equipment specification(s). it is not a VFD. like rattling sounds coming from a brake.

A wye/delta starter is a method of soft starting the motor often used on high inertia loads. You may need to adjust the time that the starter stays on the wye (start) contactor. Too much time can cause the motor to bog down (just liking a car staying in 1st gear too long), but too little time can cause the load to be shocked (like trying to start a car in 2nd gear). check with the starter and the motor manufacturer for the allowable starting time range.

 

[Eduardo Maun]

Paper Cutter!!!

Paper Cutter!!!

They just change the equipment and that ends the problem.!!!

Thank you!!!