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Thread: Clarifying 3ph Motor connections
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3rd February 2014, 10:47 PM #106Cba
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Some interesting reading on SWER
PB Report: Indicative Costs for Replacing SWER Lines - Energy and Earth Resources
When One Wire Is Enough | Archive content from TDWorld
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3rd February 2014 10:47 PM # ADSGoogle Adsense Advertisement
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4th February 2014, 04:13 AM #107
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4th February 2014, 09:55 PM #108
Thanks for those links Chris. Some clarification found there. We have been close to the mark. 12.7Kv for the main line as it is the phase to ground voltage for 22Kv 3ph. Simple.
Reminds me that I spoke to the electrician at work about 240v input VFD's. He knows about them, but has never had anything to do with them. One question he asked was regarding the voltage. If 240v is fed in, then is 240v fed out per phase, which would be equal to 415v between phases. I had a bit of a think and realised that it would be 240volts between phases and a lesser voltage from a phase to earth. I hope I am correct in this.
Dean
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4th February 2014, 10:55 PM #109
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4th February 2014, 11:00 PM #110
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6th February 2014, 10:35 AM #111Senior Member
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I finally found my leftover cable. Have maybe 2m of 12awg in few pieces and maybe a metre of 16awg 200. You can have it if its of any use. It 200 degree rated silicon sheathed.
Neil
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6th February 2014, 05:07 PM #112
Hang on to it for the moment Neil. I will keep it in mind and let you know if I need it. I am not going to do much of anything for the next 3 months or so. Vintage started today, quietly but will ramp up over the next week or so. 8 hours of confined space training today so I am completely brain dead. That was about 6 hours longer than was required for our situation, in my opinion and I will forget most of the details. I have been doing this for 16 years now. 6 am start in the morning and knock off when the work is finished.
Dean
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7th February 2014, 12:39 AM #113Senior Member
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The holding on to stuff bit i have down pat.. I just struggle when it comes time to find it again.
8 hours confined space training... thats impressive. I wouldnt have thought any organisation outside of bhp or rio tinto could pad it out that long.
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7th February 2014, 07:12 PM #114GOLD MEMBER
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Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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7th February 2014, 08:06 PM #115
That statement is so damned close to the truth. I can tell you I really struggled to stay awake. Did I take much in? I hope so, but I have my doubts. When are these people, from our HR, Govt Dept's (Never) and training providers going to realise that data overload is not conducive to retention. We don't need stuff that is totally irrelevant to our worksite.
Dean
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7th February 2014, 08:13 PM #116Sounds like fun to me!
However, it wasn't "CSR (Confined Space Rescue)". Rescue was touched on, but only in terms of the prior to entry assessment. It was a full day of the "Oh&S act, regs and other associated legislative requirements." of just the "Entry" process. We have a team to conduct rescues.
Dean
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8th February 2014, 09:58 PM #117GOLD MEMBER
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That's just what my wife says!
I figured that industry training would have a different angle to emergency response training. Yes, as part of your entry permit for CS you must have a self rescue plan in place. Working in CS is certainly an interesting occupation. Of course, many people have worked in CS and probably not realised it due to ignorance!
SimonGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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9th February 2014, 06:33 PM #118
Back on track again. I have decided to reassemble the motor, connect it in Delta mode as per the diagram inside the motor connection box lid, and hook it up to the vsd temporarily to see what happens.
I went looking for some 3ph cable today. I did find a length long enough to do what I want. It is only 1.27mm2 per conductor. I have checked this via a couple of online calculators and using a length of 2m, it seems to be acceptable. Does anyone disagree with this. I am using a total current of 25A which I think is quite generous. The vsd has a total of 23A. This is just a bench (floor) test. Should I clamp the motor down. I do not intend to run it at max speed.
Would it be better to obtain some larger gauge cable in the long run? If I mounted the vsd on the lathe I could use individual wires inside conduit.
Dean
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10th February 2014, 12:28 PM #119
The motor is back together. I have connected the vsd temporarily. It is working and even in the right direction. The speed ramps up and down. It seems almost normal to me.
The only issue is that at 50Hz the motor does not seem to be running at anything like normal speed. Can anyone make any suggestions or comments regarding this matter. One thing that was a bit of a concern, was the default frequency. When first turned on, it showed 400Hz.
Maybe I should have just connected the motor up from the beginning, but I did learn a lot along the way.
Dean
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10th February 2014, 12:30 PM #120GOLD MEMBER
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What is your setting on PD004?
Stuart
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