New Member: Dynasty 280 DX Powered off Miller Bobcat 250??

[GarageBound]

Hello from Chattanooga,

I am awaiting for a Dynasty 280 DX to ship in for demo purposes to my local Miller store to see how well it works being powered off my Miller Bobcat 250 for field work. I do some repairs on pontoon boats and stainless steel hand rails, etc. I am looking at doing dockwork and whatever else I can get my hands into. I already have a Coolmate 4 cooler that I use in my home shop with my older Syncrowave 250 machine and am hoping I can somehow use this cooler with the dynasty, too.

I have everything I need to work from home; however, am thinking I will be more marketable to be mobile as well.

I have another friend here in town that has a high frequency box he plugs into his engine driven welder that has foot control capabilities for amperage control when welding high freq' AC. Wondering if this is a cheaper solution that would be more durable than dragging a Dynasty out in the field? Also wondering if all the electronics of the Dynasty will hold up in the field?

Miller says this Dyanasty 280 DX and Bobcat 250 is a good match. Has any one else had experience with the combination in portable environments?

Thanks,

Michael

[cruizer]

Work ok, providing your bobcat is set up correct. Probably isn't, as extremely few are.

[GarageBound]

Cruizer, What set ups are you referencing?

[cruizer]

Output rpm frequency, serviced properly, condition of the slip rings ecettera

[GarageBound]

Dynasty Demo'd off Bobcat 250

My local supplier supplied me with a new Dynasty 280 DX to demo off my Bobcat 250. This particular supplier is the local Miller repair shop, as well. One of the gurus is an engine drive expert and I brought a buddy familiar with operating a Dynasty 350 at his day job to watch the Dynasty as I welded a bunch of different coupons I prepared for the demo. I also brought my Bobcat 250, Coolmate 4 water-cooled torch set up and a 25 foot 6/3 power cord to go from the Bobcat to the Dynasty.

1/4" aluminum plate was no problem, nor was stainless. I didn not have any 3/8" plate to take with me, so I had some 1/2" prepared to take it's place. I decided to test both machines' capacity with the 1/2" in aluminum. As the technician kept an eye on the bobcat, and my friend on the new Dynasty, I bonded the 1/2" aluminum plate at 283 amps. The technician said that my Bobcat did not bog down as low as most machines do when he is doing a capacity test during testing while repairing other comparable engine driven machines to their full capacities. Nor did my 50 amp breaker pop. As the data plate on the Dynasty claims at full capacity it will not pull more than 53 amps at full capacity, any way.

This is the machine I needed for my portable welding needs! I purchased the machine.

I strongly urge people to make relations with their local reps when seriously considering to purchase new equipment. In all my research, I did not find definite answers (other than what Miller claimed and suggested: to use the Dynasty 280 being powered from the Bobcat ... and their claim, so far, has been accurate) whether or not this set up would work for my needs in the marina industry. I asked as many different people in the industry that I knew, even using this site as a resourse. Apparently my machine is set up in the correct configuration, as one vaguely suggested would need to be.

I am very much looking forward to learning more about this Dynasty, open to those who can educate me, for sure! And I will share my success and failures (hopefully minimal) as time comes to pass.

Thanks!

[cruizer]

Ok, all small engine drives MUST be set at 62.5 hs measured at the 120 auxiliary receptacle. Any less and there will be problems. You may not notice a problem now, but the 280 will smoke if inadaqaue voltage is there. And it'll be a pricey boat anchor if a tech were to find out you ran it on a out of tune machine.

[WillieB]

Ok, all small engine drives MUST be set at 62.5 hs measured at the 120 auxiliary receptacle. Any less and there will be problems. You may not notice a problem now, but the 280 will smoke if inadaqaue voltage is there. And it'll be a pricey boat anchor if a tech were to find out you ran it on a out of tune machine.

I'm curious about the 62.5 HZ? Is that to allow for a bit of sag under load?

[cruizer]

62.5 hz determines correct engine rpm, and yes there is sag as these little gas engines don't have a lot of torque. Strike an arc unit drops to 60 hz. Yes the boards work on DC , however require the correct voltage to operate. Scope results show the units running at optimum efficiency at 60 hz. Any less, or more, and bad things will happen.

[WillieB]

62.5 hz determines correct engine rpm, and yes there is sag as these little gas engines don't have a lot of torque. Strike an arc unit drops to 60 hz. Yes the boards work on DC , however require the correct voltage to operate. Scope results show the units running at optimum efficiency at 60 hz. Any less, or more, and bad things will happen.

Thank you.

[GarageBound]

In-Depth Details

Ok, all small engine drives MUST be set at 62.5 hs measured at the 120 auxiliary receptacle. Any less and there will be problems. You may not notice a problem now, but the 280 will smoke if inadaqaue voltage is there. And it'll be a pricey boat anchor if a tech were to find out you ran it on a out of tune machine.

Thanks for the more in-depth details ...