Where in the World??????

Hi Phys

Could there be a provision for voltage drop? This is the case for deep well pumps. What kind of mixer is yours?

brgds

Snel

Bottom mount mag mixer for a 200L tank. Assuming the VFD is in a control room (this is Pharmaceutical for a clean room) it might be 100 feet to the mixer from the VFD.

I remember 117 / 208 V was used in the USA some decades ago, maybe still in use somewhere else.

Decades ago? We got that in all of our plants as well as 480V.

Thanks.

Must be spare stock the mixer manufacturer is moving out for VFD use since it will work fine on one of them in most countries.

No, I'd say they are designing for expected voltage drop. They know the application will always involve the unit being at the end of a submersible cable, which will be limited in size. In other words you can solved voltage drop issues in many cases by increasing the conductor size, but not if the conductor has to pass through a factory water tight seal, especially if molded. So they expect there will always be a VD and design the windings accordingly. If you assume a 7% VD on a 220/380V system, you end up with 205/355V. As previously mentioned this is done all the time with submersible pumps for the same reason.

What expected voltage drop? The unit is a gear drive motor for a mag drive mixer (see previous posts) by a mixer company specifically targeting the pharma industry. It is mounted on a pharmaceutical tank on casters. The drive mounts outside the tank - the magnet drives the mixer inside the tank. No submersible cables - distance from VFD usually 10 feet or less - tank is in dry clean temperature controlled too clean room - cable is VFD specific cable run loose on the floor in 95% of the cases - motor is in the ambient room surroundings.

See if this helps - it is on a Nord SK 71 L/4 gear drive - Nord lists only standard voltages for this unit on their sites - I tried European and North American sites. There are several used for sale on a German site and they are also standard Euro voltages. The actual mixer manufacturer had Nord supply these motors with the weird voltage ratings. I still say they got a spanking good deal on a motor that Nord was stuck with and thought they'd never move. Since the mixer company knew for certain that the end user would use a VFD with this, they knew the motor would work just fine. It is for use here in the USA and most VFD applications for a mixing tank like this in the pharma industry involves a single phase 120V VFD that puts out three phase 230 volt. Typically used since it is very easy to find a power source for this anywhere in the plant. Works just fine for this.

Are you damn sure that name plate says 205/ 355? or is it 205/ 385? can you produce photo of the name plate?

I may be way off base here, but I purchased a step up transformer that puts out 50 Hz. If your in a foreign country, you run 220 volts of their current into it, and you get 110 volts out at 60 Hz.Then you can run your American appliances. If using it in North America, you run 110 into it, and it puts out 220 volts at 50 Hz. so you can run your appliances from another country that has 220 at 50Hz.North America runs on 110 or 220 at 60Hz,and most all other countries run 220, and 440 at 50Hz. I use mine as a step up transformer out here in the woods where I live. Since we have so many times been without electricity for days at a time, I installed several batteries, and a 8,000 watt inverter.It puts out 124.7 volts at 60 Hz, which I run into the step up transformer to get 240 volts AC so I can operate my deep well and my ham radio equipment. Your mixer is from a foreign country, or made here for a foreign country. In this country, we make a lot of appliances for 50 Hz at various voltages. Hope this helps. Bob KC0VEA

Hi Rcrain it Hertz me to say this, but if 50 Hz goes in 50 Hz comes out if it is a transformer, the voltage may have changed but the frequency remains the same,You may have an inverter but I dont think so. I think that you are way off topic. But I request that you provide a photo of the device, that is intelegent enough to work out which area you are in, let alone what voltage you requie.

Or maybe I have missed the plot

Best Regards

Joe

OK Joe, here goes. We already had this discussion in great detail. The big heads on here agreed that because my inverter puts out a 60Hz signal, that is what the transformer puts out also. Some disagreed, saying it would remain at 50Hz, but would not harm anything, it would just run my appliances at a reduced speed. But, I most certainly do know what I am talking about. I have it hooked up and using it.I think you might have misunderstood my post, or I did not make my self clear enough. Several fine people on here helped me out. I`m not computer literate, and I don`t come here that often to tell you where to look for that discussion, but I`m sure someone more knowledgeable than I can.I have a AIMS 8,000 watt INVERTER going into a 10,000 watt STEP UP TRANSFORMER. I would have bought one made in America, but I could buy a new car cheaper. The one from another country cost me 300.00 with free shipping, so I went that route, unfortunately it is 50 Hz. I hope this help explains it Joe, and you have a great day, I know I will. Bob KC0VEA

Joe, sometimes I amaze myself. If you look in general discussions, under 60Hz motors with 50Hz supply, you will find this great discussion we had on here, and I believe someone supplied some photos. I can`t believe I actually found it myself. I`m going to break my old arm patting myself on the back. May not mean alot to you young bucks, but its a major acheievment for me.I`m old, but I still kick up a little dust now and then. Please check out that discussion Joe, as it was a good one. Have a great day, I know I will now. Bob KC0VEA

As a after thought, I was wondering something. It says under my picture, 66 post, 1 good answer. I checked, and I have 10 good answers. Am I missing something here?? Really has nothing to do with todays post, but I was curious.

Hi Phys, the voltage does sound a bit strange, but since you are using a VFD, you can programme into the VSD the motor voltage, I have never had to programme in a voltage so extreme, but I suppose it can be done.

Check it out,

Best Regards

Joe

Extreme programming? This is a piece of cake. Try making a non-VFD ready motor with only 60% efficiency run on a VFD. Get into the torque/voltage curve re-setting programs some time just for fun.

I just wanted to know where the motor was originally intended for as the weird voltage is not from any major country I am familiar with.

The key here is 50 HZ - that is Canadian or European. You won't find it in the US with a working grid. You will have problems with this motor if you run at 60 Hz, but I am not sure to what extend nor how long the motor will last. I am not an EE - just a ME that specifies motors for equipment on occasion.

If the voltage ranges across the numbers shown, 208 or 220/230 should work with the motor. This is pretty standard in the US and as i recall in Canada as well. I think they have higher 3 phase voltages, but you are covering all the way up to 355 (or 385) - you should be fine there.

Unless the motor is huge, it should not cost that much to replace just the mixer motor. If you don't want to spend a couple hundred on a new one, then look for a used one at an auction or something. Recycle the old one - copper is through the roof right now, so it might just be a wash if you find the right auction...

There is no problem with the voltage/Hz as it is going onto a VFD and I and the customer can control what the motor receives. In fact, the 50Hz is a boon as now the motor has additional speed it did not before, if needed. The issue was where was this thing designed for? Certainly not the US or any major European or Asian country I am familiar with.

I found 2 instances of that voltage class, both in OLD publications in google books. One was a street railway in New England (early 1900's) and the other was a generator installation in Belgium (1920's).

The location may have a legacy power system from before voltages were standardized. In the early 1990's I worked on upgrading a manufacturing facility with an attached hydro plant. We replaced the original 25 Hz generators and motors with 60 Hz equipment. The 25 Hz equipment was still in use as an isolated system until 15 years ago.