Posted: 5/24/2012 5:08:07 PM EDT
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1680 RPMS foward, to 1680 RPMs reverse in under a second.
Tech in class today figured out you can set the accelerate, and deccelerate times to 0 seconds, then threw it in reverse. 
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| There is a sticker on the small weight on the output shaft of the motor, in HD you can see it stop for a fraction of a second. On the controler, the top number is the referance frequancy, the small numbers under it are the actual frequancy the VFD is putting out. |
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Let's see you try that on something like a 150 HP cocoa mill. go ahead, I'll be over there ... 
Those drives I posted above your post go to an 800 HP motor, there are two motors coupled together.  . Six A1000 drives total.
Let's see your trick. No way in hell. I have seen a guy close a breaker out of phase on a synced generator setup.
ETA: these are not small generators. In the picture they are the three yellow Cat engines. 
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| I doubt it would let you do that on a big load anyway. The drive should fault before it melts the motor windings or explodes the coupling. But I guess we won't know till you try. I've never witnessed a motor meltdown bigger than 200 HP myself. Should be fun at 800 HP if it goes. |
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I doubt it would let you do that on a big load anyway. The drive should fault before it melts the motor windings or explodes the coupling. But I guess we won't know till you try. I've never witnessed a motor meltdown bigger than 200 HP myself. Should be fun at 800 HP if it goes. I doubt the drive will allow it either. Especially without a regen setup, or a dynamic brake. Our dynamic brakeing resistors are the size of an F-150 standing on end, and there are two of them. |
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I doubt it would let you do that on a big load anyway. The drive should fault before it melts the motor windings or explodes the coupling. But I guess we won't know till you try. I've never witnessed a motor meltdown bigger than 200 HP myself. Should be fun at 800 HP if it goes. I doubt the drive will allow it either. Especially without a regen setup, or a dynamic brake. Our dynamic brakeing resistors are the size of an F-150 standing on end, and there are two of them. What are you powering with that setup? |
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I doubt it would let you do that on a big load anyway. The drive should fault before it melts the motor windings or explodes the coupling. But I guess we won't know till you try. I've never witnessed a motor meltdown bigger than 200 HP myself. Should be fun at 800 HP if it goes. I doubt the drive will allow it either. Especially without a regen setup, or a dynamic brake. Our dynamic brakeing resistors are the size of an F-150 standing on end, and there are two of them. What are you powering with that setup? Drawworks. The rated hookload is 750,000lbs. The mud pumps and top drive have 800hp each (top drive is twin 400hp motors, mud pumps each have a single 800hp motor) but they do not need the dynamic braking. We have 5 bays of these drives. |
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I doubt it would let you do that on a big load anyway. The drive should fault before it melts the motor windings or explodes the coupling. But I guess we won't know till you try. I've never witnessed a motor meltdown bigger than 200 HP myself. Should be fun at 800 HP if it goes. I doubt the drive will allow it either. Especially without a regen setup, or a dynamic brake. Our dynamic brakeing resistors are the size of an F-150 standing on end, and there are two of them. What are you powering with that setup? Drawworks. The rated hookload is 750,000lbs. The mud pumps and top drive have 800hp each (top drive is twin 400hp motors, mud pumps each have a single 800hp motor) but they do not need the dynamic braking. We have 5 bays of these drives. I used to love working on those mud pumps. What model are they? |
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I doubt it would let you do that on a big load anyway. The drive should fault before it melts the motor windings or explodes the coupling. But I guess we won't know till you try. I've never witnessed a motor meltdown bigger than 200 HP myself. Should be fun at 800 HP if it goes. I doubt the drive will allow it either. Especially without a regen setup, or a dynamic brake. Our dynamic brakeing resistors are the size of an F-150 standing on end, and there are two of them. What are you powering with that setup? Drawworks. The rated hookload is 750,000lbs. The mud pumps and top drive have 800hp each (top drive is twin 400hp motors, mud pumps each have a single 800hp motor) but they do not need the dynamic braking. We have 5 bays of these drives. I used to love working on those mud pumps. What model are they? Gardner denver something or anothers. The motor is built by GE, other than that, nd how to wire them up, I got nothing. I know I used to build herringbone gears for them when I worked in the machine shop.
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I doubt it would let you do that on a big load anyway. The drive should fault before it melts the motor windings or explodes the coupling. But I guess we won't know till you try. I've never witnessed a motor meltdown bigger than 200 HP myself. Should be fun at 800 HP if it goes. I doubt the drive will allow it either. Especially without a regen setup, or a dynamic brake. Our dynamic brakeing resistors are the size of an F-150 standing on end, and there are two of them. What are you powering with that setup? Drawworks. The rated hookload is 750,000lbs. The mud pumps and top drive have 800hp each (top drive is twin 400hp motors, mud pumps each have a single 800hp motor) but they do not need the dynamic braking. We have 5 bays of these drives. I used to love working on those mud pumps. What model are they? Gardner denver something or anothers. The motor is built by GE, other than that, nd how to wire them up, I got nothing. I know I used to build herringbone gears for them when I worked in the machine shop.Yeah, those used to be my bread and butter.  Rough rider 500's, PE-5's, OPI's....all good pumps and built like tanks.
It didnt pay much back then, but damn I had a good time at that job. |
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I doubt it would let you do that on a big load anyway. The drive should fault before it melts the motor windings or explodes the coupling. But I guess we won't know till you try. I've never witnessed a motor meltdown bigger than 200 HP myself. Should be fun at 800 HP if it goes. I doubt the drive will allow it either. Especially without a regen setup, or a dynamic brake. Our dynamic brakeing resistors are the size of an F-150 standing on end, and there are two of them. What are you powering with that setup? Drawworks. The rated hookload is 750,000lbs. The mud pumps and top drive have 800hp each (top drive is twin 400hp motors, mud pumps each have a single 800hp motor) but they do not need the dynamic braking. We have 5 bays of these drives. Are these motors traditionally XP motors, standard TEFC, ODP, C-Face, or what? |
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. TEFC. 2.5hp blower motor IIRC.
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I doubt it would let you do that on a big load anyway. The drive should fault before it melts the motor windings or explodes the coupling. But I guess we won't know till you try. I've never witnessed a motor meltdown bigger than 200 HP myself. Should be fun at 800 HP if it goes. I doubt the drive will allow it either. Especially without a regen setup, or a dynamic brake. Our dynamic brakeing resistors are the size of an F-150 standing on end, and there are two of them. What are you powering with that setup? Drawworks. The rated hookload is 750,000lbs. The mud pumps and top drive have 800hp each (top drive is twin 400hp motors, mud pumps each have a single 800hp motor) but they do not need the dynamic braking. We have 5 bays of these drives. Are these motors traditionally XP motors, standard TEFC, ODP, C-Face, or what? |
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I was primarily referencing the 800HP mud motors. I'd venture they're just standard TEFC or XP. They are TEFC. Just saying that the FC fan cooled part is taken care of by a 2.5hp blower motor. And after checking GE's site, they may be 1500 hp motors. I'll have to check next Wednesday. |
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I sell gear units that mate large motors to compressors, pumps, etc. Try that in the real world and shit starts hitting the fan.
I have rebuilt mud pump and drawworks gear boxes as a machinist for the last 8 years, have have seen some stuff that blew my mind. 
We use the same controls on our large setups as the one in the video (yaskawa A1000hhp and G5HHp), which is why I was surprised you could set accel and decel rates to 0 seconds. |
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VFD's rock.
On the topic of electrical destruction- we had a switch gear failure on a 1250hp compressor driver recently. It opened the MCC cabinet with little effort. Funny thing is the motor was running, usually that shit happens on start up. Posted Via AR15.Com Mobile |
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I was primarily referencing the 800HP mud motors. I'd venture they're just standard TEFC or XP. They are TEFC. Just saying that the FC fan cooled part is taken care of by a 2.5hp blower motor. And after checking GE's site, they may be 1500 hp motors. I'll have to check next Wednesday. Got ya. I've been seeing a lot of soft-starts being requested lately for pumping applications. Pretty good stuff. I talked to a vendor yesterday that recently sold a $5 Million VFD to Consol Energy for their belt line at one of their central prep plants. VFD's are not so much my specialty. |
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1680 RPMS foward, to 1680 RPMs reverse in under a second. Tech in class today figured out you can set the accelerate, and deccelerate times to 0 seconds, then threw it in reverse.
 http://www.youtube.com/watch?v=80CX_IeA_dMSo you're experiencing the 21st Century equivalent of the asshole kids in high school shop that have to test the teacher's warning about threaded chucks on their lathes ... |
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I sell gear units that mate large motors to compressors, pumps, etc. Try that in the real world and shit starts hitting the fan.
Yeah. Play now. Once you get in the real world that shit gets expensive really quick. Can also lead to you looking for a new job. |
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Quoted: Quoted: I sell gear units that mate large motors to compressors, pumps, etc. Try that in the real world and shit starts hitting the fan. Yeah. Play now. Once you get in the real world that shit gets expensive really quick. Can also lead to you looking for a new job. x2 or even death. When you start getting into the high speed/high power equipment things get very dangerous. There was a European gear company that had a gear failure back in the 90's. The entire bull gear split in half. IIRC it killed 6-8 people. I have a picture of it somewhere. I will see if I can find it and post it. Edit: Found the pic. It happened in Leipzig Germany. It was around a 80MW (100,000HP) rated gear unit. The diameter of the bull gear was around 36". The cause of the failure was due to an inclusion in the forging. When it started up the inclusion cause a crack that propagated and lead to total rupture of the forging. Scary stuff to think how much energy was released when that happened.  |
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1680 RPMS foward, to 1680 RPMs reverse in under a second. Tech in class today figured out you can set the accelerate, and deccelerate times to 0 seconds, then threw it in reverse.
http://www.youtube.com/watch?v=80CX_IeA_dMSo you're experiencing the 21st Century equivalent of the asshole kids in high school shop that have to test the teacher's warning about threaded chucks on their lathes ... Pretty much. The average age in the room is probably 42. |