5HP VFD with single phase input, low cost drives

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Product
5HP VFD with single phase input, low cost drives
Posting date : Jul 25, 2016
Membership
Free Member Scince Jul 25, 2016
FOB Price
5000
Min. Order Quantity
5
Supply Abillity
500000
Port
Shenzhen
Payment Terms
T/T
Package
900*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
900*400*800
Delivery Lead Time
15 days
Detailed Description
A VFD consists of a rectifier/filter section which converts the incoming AC to DC. This high-voltage DC is then converted back to AC with additional controls which provide the speed control. The problem with single-phase AC power is at the input side of the VFD, the part that converts incoming power to DC. When you rectify a three-phase power source, the output voltage from the rectifier never drops below 50% of the peak voltage. This makes it real easy to filter and provide pure DC to the rest of the equipment.
 
However, when you rectify single-phase power, the output voltage of the rectifier drops to zero 120 times a second. The task of filtering this to provide pure DC is much more difficult. The standard rule-of-thumb is to derate the VFD by 50% when operating from a single-phase source. Thus, if you want to run a 2.5HP motor, you need a VFD rated for 5HP.I would not recommend operation of any VFD on single-phase power unless such usage is proper according to the manufacturer. If not discussed in the owner's manual, you can always contact the maker's technical support department and ask for assistance.
 
VFDs typically run on single phase power and convert it to three phase power to the motor. Three phase is preferred for speed control as it is easier to implement and maintains near 100% torque at low speeds Bottom line. Buy a VFD, connect it to a 3 phase motor, plug it into 120 or 240 single phase outlet and you are good to go. BTW, I have a couple of Rob's units, one for my KMG and another for the 9 inch disk grinder. They are top quality and easy to set up and if you do have a problem Rob is always there to help.
 
The only problem is the small VFDs are only rated for about 3 HP, but check the amp draw on the motor, you might be able to squeak by on the amp rating, and it would also give you a lot more speed control. You might want to look at the insulation rating on the motor. Also, with heavy use, it needs to be an F rated insulation on the windings. The rating will be on the data plate.
 
Variable frequency drive (VFD) systems make use of a motor, operator interface and drive controller assembly. Motors used in VFD systems are normally three-phase induction styles. Single phase motors or synchronous may be used. The torque and speed of the motor is controlled by changing the input voltage and frequency.
 
 
 
 

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