LI XIANG Variable-frequency drive-lx3000-01

LI XIANG Variable-frequency drive-lx3000-01 System 1

LI XIANG Variable-frequency drive-lx3000-01

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Loading Port:: Ningbo

Payment Terms:: TT OR LC

Min Order Qty:: 1 unit

Supply Capability:: 10 unit/month

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Energy savings

Many fixed-speed motor load applications that are supplied direct from AC line power can save energy when they are operated at variable speed by means of VFD. Such energy cost savings are especially pronounced in variable-torque centrifugal fan and pump applications, where the load's torque and power vary with the square and cube, respectively, of the speed. This change gives a large power reduction compared to fixed-speed operation for a relatively small reduction in speed. For example, at 63% speed a motor load consumes only 25% of its full-speed power. This reduction is in accordance with affinity laws that define the relationship between various centrifugal load variables.

In the United States, an estimated 60-65% of electrical energy is used to supply motors, 75% of which are variable-torque fan, pump, and compressor loads. Eighteen percent of the energy used in the 40 million motors in the U.S. could be saved by efficient energy improvement technologies such as VFDs.

Only about 3% of the total installed base of AC motors are provided with AC drives. However, it is estimated that drive technology is adopted in as many as 30-40% of all newly installed motors.

An energy consumption breakdown of the global population of AC motor installations is as shown in the following table:

Global population of motors, 2009
	Small	General Purpose - Medium-Size	Large
Power	10W - 750W	0.75 kW - 375 kW	375 kW - 10000 kW
Phase, voltage	1-ph., <240V	3-ph., 200V to 1kV	3-ph., 1kV to 20kV
% total motor energy	9%	68%	23%
Total stock	2 billion	230 million	0.6 million

Control performance

AC drives are used to bring about process and quality improvements in industrial and commercial applications' acceleration, flow, monitoring, pressure, speed, temperature, tension, and torque.

Fixed-speed loads subject the motor to a high starting torque and to current surges that are up to eight times the full-load current. AC drives instead gradually ramp the motor up to operating speed to lessen mechanical and electrical stress, reducing maintenance and repair costs, and extending the life of the motor and the driven equipment.

Variable-speed drives can also run a motor in specialized patterns to further minimize mechanical and electrical stress. For example, an S-curve pattern can be applied to a conveyor application for smoother deceleration and acceleration control, which reduces the backlash that can occur when a conveyor is accelerating or decelerating.

Performance factors tending to favor the use of DC drives over AC drives include such requirements as continuous operation at low speed, four-quadrant operation with regeneration, frequent acceleration and deceleration routines, and need for the motor to be protected for a hazardous area. The following table compares AC and DC drives according to certain key parameters:

Drive type	DC	AC VFD	AC VFD	AC VFD	AC VFD
Control platform	Brush type DC	V/Hz control	Vector control	Vector control	Vector control
Control criteria	Closed-loop	Open-loop	Open-loop	Closed-loop	Open-loop w. HFI^
Motor	DC	IM	IM	IM	Interior PM
Typical speed regulation (%)	0.01	1	0.5	0.01	0.02
Typical speed range at constant torque (%)	0-100	10-100	3-100	0-100	0-100
Min. speed at 100% torque (% of base)	Standstill	8%	2%	Standstill	Standstill (200%)
Multiple-motor operation recommended	No	Yes	No	No	No
Fault protection (Fused only or inherent to drive)	Fused only	Inherent	Inherent	Inherent	Inherent
Maintenance	(Brushes)	Low	Low	Low	Low
Feedback device	Tachometer or encoder	N/A	N/A	Encoder	N/A

Q: I'm comparing the GP 6500 with 389 cc engine (splash lubrication) to the XG 6500 with a 410 cc industrial engine (oil pump pump lubrication). I would be using it for home emergency use, so I doubt I really need the industrial engine with oil pump. Over 10 years it will probably only get 100 hours on the engine mostly at a consistent 50% load with occasional short term peaks closer to max (toaster, sump pump coffee pot, etc). So I'm leaning towards the cheaper GP. But want to consider the following:Are they both easy to pull start? The biggest engine I pull start is my snowblower with a 250cc OHV Briggs. But when starting only the engine is turned, i.e. it's not engaged to the snowblower yet. The hardest thing I have to start is my power washer with a 160cc OHV Kohler. I think because it's directly connected to the pump which makes it harder to start.Is the XG industrial engine quieter than the GP engine?: Generac Xp

Q: I have a 1 inch plastic conduit and am running about 100 feet underground?: You best safe guard is to use UTP for the wiring - that way you will be sure there will be no hassles

Q: I want to get into a field that involves fixing electrical equipment. I have always loved taking apart things like my Xbox/Playstation/cell phone so I could fixing them when they broke and I would like to further this into a career. What type of field should I study in order to pursue this goal? I am a student at the University of Arizona, so if you know of any programs there that would help a lot.: None, depending on how or where you work. If you work for yourself you don't need any degree at all. You need to be an electronics service engineer. You have to be able to do the job. That's more important than having a piece of paper that says you got good grades and showed up or class. (I would argue this is true for most fields) You can get a degree in electronics engineering at many schools. It would be very helpful to find work at a company specializing in service of these things. Nobody repairs cell phones, it just isn't worth doing.

Q: i replaced my home theater system thinking it was busted but when i recieved my new one it still had the same buzzing sound i noticed the buzz is in the bedroom too: It sounds like somewhere in your electrical you either have a bad ground, or there is a florescent lamp or some other piece of electrical equipment causing the noise. Surge protectors will only help with an electrical surge, a power conditioned is what is used to remove noise from electrical lines. Check the different electrical equipment in the house by turning things off or unplugging them and check if the noise goes away, if not it could be in your electrical system or some kind of outside interference. If you still issues purchase a surgex power conditioner and that should take care of your issue.

Q: I am undecided whether I want to become a Electrical Engineer or a Master Electrician. I know that Master Electricians can start their own business (Contractor) or take responsibility on a project. Electrical Engineers are the ones who design electrical equipment and that design the electrical projects. I am just curious of which career would have more opportunity to make more salary. I also would like to know if an Electrical Engineer can also be a contractor like the Masters electricians. Country: USA: Electrician Engineer

Q: I am about to finish my BS in Electrical Engineering and was considering getting a MS in EE but considering how the economoy is and the fact that the Bureau of Labor Statistics say it should grow slower than average. This being said what do you guys think is the most prudent thing to do in my case. Go for an MS Engineering Degree or start out with another degree maybe in healthcare.: Skip the Masters in Engineering get an MBA. This will enable you to get a high paying executive management position in the Engineering Industry, instead of an Engineering design position (less pay more headaches). Good luck.

Q: I bought some electrical equipment at a cheap price but it was due to a discount error.I placed the order and recieved the confirmation.Can they refuse to send my the products or change the price?Your help is much appriciated.: Depends on what you mean by discount error If you used a promo code that is not supposed to be valid on the item you purchased, then NO, he does not have to honor your order just because the system accepted it. On the other hand, if he has the item listed incorrectly (ie, $10 instead of $100) than yes, he should have honor it. Make sure to look for anything on the website that says something along the lines of prices subject to change which could be used as a loophole. Either way though, he may not charge you more without your permission. In Califonia, if an item in a store is marked a certain price, it is actually illegal for the store to try to charge you more when you attempt to purchase the item. However, based on the fact that you may not even be in the same state as the store, things get a little murky. The best answer is simply to cross your fingers, as the internet is really a grey area. UPDATE: In follow-up, no they absolutely cannot demand that you send it back after you've receieved it. Nor can they try to charge you more afterwards. If it gets shipped, then it's yours to keep!

Q: i.e. extended warranty.: I know this isn't much of an answer but I think it depends on the item. For example, I bought a $32 toy and toys-r-us tried to sell me a warranty that was $12. Doesn't really make sense. But the warranty on my flat screen TV is probably a good value. -- On a side note, it is wonderful that items are so cheap now that we have to consider the value of the warranty but I am worried about out throw-away society. I had a neighbor that just bought a new lawn mower because it leaked oil. That would cost $12 to fix. Oy!

Q: Do they actually build stuff or just wire them? I know this is probably a stupid question.: no it isn't, you learn a lot other than just wire handling here is a link of what you learn in a 4 year course of bachelors in engineering csvtu.ac.in/syllabus_new.htm

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