3 phase motor dropping voltage with load.

[flagvan2000]

I have a 10 HP -230 volt 3 phase hydraulic press brake. I just installed a new 40 HP rotary converter panel with used WEG motor. The problem i am having is the volts going into the press during a load is dropping from 245 to 195-200 volt. Which means i'm loosing power of the hydraulic system. Wonder if anyone has a idea of what could be causing this. The required rotary converter is a 30HP and i went to a 40HP just to make sure.

I attacked pictures of the 40 HP used motor running my phase converter

 

[Pete999]

How are the rotary elements started?

 

[flagvan2000]

How are the rotary elements started?

I have a rotary starter panel made from a company out of Wisconsin. It is a soft start panel. I will add a link showing what it is. Rotary Phase Converter Control Panel CP-40 - https://www.northamericaphaseconverters.com/product/control-panel-cp-40/

 

[Pete999]

I have a rotary starter panel made from a company out of Wisconsin. It is a soft start panel. I will add a link showing what it is. Rotary Phase Converter Control Panel CP-40 - https://www.northamericaphaseconverters.com/product/control-panel-cp-40/

Not sure about US cable sizes and ccc are the feed cables sizes correctly, to try and alleviate any VD problems? clutching at straws now.

 

[Lucien Nunes]

Agree with Pete, I would first check the supply to the converter, to see how much the voltage on the single-phase side is dropping. If that is reasonably steady, then check whether the voltage drop at the converter 3-phase output is symmetrical or not and perhaps report your findings to the panel manufacturers.

From what I can read on the plate the converter looks like a 12-wire motor. Is it definitely connected to the panel correctly, with the right voltage configuration? If the series-parallel arrangement of the windings is wrong, it might start and run OK but lack power as a converter once under load.

 

[Megawatt]

I have a 10 HP -230 volt 3 phase hydraulic press brake. I just installed a new 40 HP rotary converter panel with used WEG motor. The problem i am having is the volts going into the press during a load is dropping from 245 to 195-200 volt. Which means i'm loosing power of the hydraulic system. Wonder if anyone has a idea of what could be causing this. The required rotary converter is a 30HP and i went to a 40HP just to make sure.

I attacked pictures of the 40 HP used motor running my phase converter

Let me ask you a few questions when you changed from a 10 HP to a 40 HP did you up grade the starter size, the overloads, and the wiring. The starter should be size 4 and the wiring should # 8

Agree with Pete, I would first check the supply to the converter, to see how much the voltage on the single-phase side is dropping. If that is reasonably steady, then check whether the voltage drop at the converter 3-phase output is symmetrical or not and perhaps report your findings to the panel manufacturers.

From what I can read on the plate the converter looks like a 12-wire motor. Is it definitely connected to the panel correctly, with the right voltage configuration? If the series-parallel arrangement of the windings is wrong, it might start and run OK but lack power as a converter once under load.

I meant the starter size should be 3 not 4

 

[flagvan2000]

Let me ask you a few questions when you changed from a 10 HP to a 40 HP did you up grade the starter size, the overloads, and the wiring. The starter should be size 4 and the wiring should # 8
I meant the starter size should be 3 not 4

Yes the starter has been upgraded. I bought a new starter panel from a rotary phase company. The wires run to everything has also been upgraded and is sized for 100 amp load. The motor is a 12 wire and i wired it to run 230 volt. It is a used motor.

this link is the 40HP panel i got to run everything. Very nice systems. I had a 20hp for years.

Rotary Phase Converter Control Panel CP-40

CP-40 BEST SIZED FOR: cp40 Best Performance Single Motor Start: 20HP Recommended 3 Phase Sizing: 50 Amps Total Combined Load: Please Call for Sizing (877) 545-2926 Easy Motor Loads up to 30HP... Table Saw, Drill Press, Milling Machine Medium Loads up to 25HP... Belt Sander, Grinder, Mixer...

www.northamericaphaseconverters.com

 

[flagvan2000]

Let me ask you a few questions when you changed from a 10 HP to a 40 HP did you up grade the starter size, the overloads, and the wiring. The starter should be size 4 and the wiring should # 8
I meant the starter size should be 3 not 4

Also i didn't replace the 10hp on the press with a 40HP. The 40HP motor is what is running the 3 phase converter. Just wanted to make sure i said that correctly.

 

[RAGPCX]

I have a 10 HP -230 volt 3 phase hydraulic press brake. I just installed a new 40 HP rotary converter panel with used WEG motor. The problem i am having is the volts going into the press during a load is dropping from 245 to 195-200 volt. Which means i'm loosing power of the hydraulic system. Wonder if anyone has a idea of what could be causing this. The required rotary converter is a 30HP and i went to a 40HP just to make sure.

I attacked pictures of the 40 HP used motor running my phase converter

I have a 10 HP -230 volt 3 phase hydraulic press brake. I just installed a new 40 HP rotary converter panel with used WEG motor. The problem i am having is the volts going into the press during a load is dropping from 245 to 195-200 volt. Which means i'm loosing power of the hydraulic system. Wonder if anyone has a idea of what could be causing this. The required rotary converter is a 30HP and i went to a 40HP just to make sure.

I attacked pictures of the 40 HP used motor running my phase converter

Hi you may have to check the following. loose wiring connections, defective circuit breakers, the contactor contacts may be pitted, mechanical defects.