1HP VFD, 50Hz/60Hz 220V single phase input

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Product
1HP VFD, 50Hz/60Hz 220V single phase input
Posting date : Jul 25, 2016
Membership
Free Member Scince Jul 25, 2016
FOB Price
2000
Min. Order Quantity
5
Supply Abillity
500000
Port
Shenzhen
Payment Terms
T/T
Package
600*400*800
Keyword :
Category
Contact
kimmy Lee
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Product Detail
Company Info
 
Quick Detail
Place of Origin
China [CN]
Brand Name
VFDS
HS-CODE
8501-31
Package & Delivery Lead Time
Package
600*400*800
Delivery Lead Time
15 days
Detailed Description
The major source of problems in the real world is conducted emissions and these are typically in the region of 20kHz to 10MHz. The source of the emissions is the output of the VFD which comprises 6 solid state switches that switch each output between the DC bus rails. These switches are typically high speed IGBTs which can switch in less than 100nS.The output waveform is a PWM waveform designed to create a sinusoidal current flow into the motor.
 
All VFD applications require programming. You have to make it do what you want. Parameters like minimum and maximum frequencies, number of motor poles, maximum current, overload response, braking behavior, acceleration profiles, etc. must be set by the user to match your installation's needs. The voltage/frequency curve is user configurable too, which is very useful for your kind of application where you are operating outside the normal frequency range of the motor. Good VFDs come with a display that can be set to show the motor speed (or any number of other parameters). If I were doing this, I would use a 1HP 208V two-pole motor and a 1HP VFD with a 240V input.
 
One feature that is present in the Mitsubishi VFD and not present in cheaper units that I have installed is a braking resistor. These are used in applications where you want to use the motor as a brake to stop the machine or control the speed of a descending load. The bigger the resistor, the quicker the stop can be programmed in. You can eliminate coasting, even under significant load, when using a resistor. A unit without this resistor built in is quite a bit smaller in size and less expensive. Often an external resistor can be added to the cheaper units if you decide you want to add one later, but at least you aren't paying for it when you don't need it.
 
1hp VFD blows one of the fuses on the line side of the drive and then continues to operate on single phase supply. The fuse size that keeps blowing is a 6A fuse. This motor is a 9-lead motor which originally was wired incorrectly, which we thought was the problem, however now we have confirmed that the motor is wired correctly and it is still blowing this same phase fuse every time. I wouldn’t suspect the fuses are too small because after the fuse blows and the drive is running on single phase supply we would expect the current on the two remaining phases to increase and thus blow the other two fuses if they were marginal.
 
Although the exact configuration of each section of the Variable Frequency Drives may vary from manufacturer to manufacturer, the basic structure remains the same. The rectifier section consists of an array of fast-acting switches that convert an incoming ac voltage supply to a pulsating dc voltage. The intermediate circuit consists of a dc bus and associated circuitry to stabilize and smooth the pulsating rectifier output. The dc bus voltage is roughly 1.414 times greater than the incoming ac supply voltage, depending on design type. This dc bus voltage is made available to the inverter section, which synthesizes an ac sine wave voltage output from the dc bus voltage.
 
VFD manufacturers’ installation recommendations aside, how much voltage can a motor’s winding insulation really tolerate? The winding insulation system on existing general purpose motors may generally withstand pulses of 1000 V, which is totally inadequate for IGBT drives on 480 V systems. If the ac input voltage to the VFD is 240 V or less, the dc bus voltage is kept low and the magnitude of these “reflected waves” generally is not an issue. However, with higher motor horsepower, these lower utilization voltages are not always feasible. If the ac input voltage is 480 V with possible higher transient overvoltage, "inverter duty rated" motors become an option. But what is an "inverter duty rated” motor? The definition varies depending on whom you ask. NEMA MG1 Part 30 specifies a peak of 1000 V at 2 microseconds rise time, which is OK for SCR and BJT drives but definitely not for IGBT drives on 480 V systems.

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