VFD Buying Guide

Posted by Paul Rossiter 18/01/2014 13 Comment(s) Variable Frequency Drives,

13 Comment(s)

29/10/2014, 12:34:58 PM, www.abst26.com

Please send price and delivery time for one VFD,IP20, as follow : 60 HP, 440VAC , with display included ,and a pressure transducer , the application is to keep a water constant pressure system ,please send us an application guide for your VFDs Best regards Freddy Aular

Romeo Bungay:
29/11/2014, 01:49:00 AM

We have a 10 HP 3phase motors for winching machine, is it OK to use VSD with 3phase,15 HP capacity. Appreciating your favorable feedback. Thank you very much.

01/12/2014, 12:50:00 PM

Yes you can use an over-sized VFD for your application.

19/12/2014, 04:22:04 PM

Have a 7.5hp 3 phase lathe. Trying to run on 240v single phase. What are my options? I don't need full 7.5hp of the lathe (this lathe is oversized for my needs, but got a good deal).

22/12/2014, 10:32:00 AM

Hi Ben,We still need to use a drive that covers 7.5HP even if your lathe requires less than the maximum horsepower. Let me ask you a questions before providing a suggestion.(1) Is it a spindle lathe? (2) Do you have an encoder? (3) What is the full load amps (FLA) of your motor? You can find that on your motor nameplate.If you prefer to call us, we are more than happy to help you out! 800-800-2261

23/12/2014, 06:45:45 AM

(1) - Yeah. A 18"x59" metal lathe. (2) - It's built in 1984. Not sure, but probably not? (3) - I made a mistake. Looks like the motor is only a 5hp. 14amps.

23/12/2014, 12:29:00 PM

Ben,We have just sent you an e-mail. Let us if we can help you further. Thanks!

Willy Tom:
14/01/2015, 08:01:43 AM

I have a mixer that serves 2 types of mixes. For example the thin mix will only require low power torque around half or less. The thick mix will require full power torque of the motor. Both mixes will use the same RPM.Some of the questions I have.1) Will a VFD work on this application?2) Will it save and use half of the energy for the thin mix?3) Can the VFD automatic sense the require preprogrammed require torque automatic adjust to the require torque. Let said if we mixing thin mix, the VFD will automatic use low torque.4) Can the VDF be preprogrammed to auto sense the require torque for example during initial mix the require torque is very low but the mix will get thicker as more ingredient is added for the thick mix.Thanks

21/01/2015, 10:27:00 AM

Yes, a VFD will work for your application and will allow you some control in how fast you would like the mixer to operate at. VFDs often result in energy savings by creating more efficient operations. With applications that require high torque (like mixers) it is hard to see significant energy savings because the demand is still going to be pretty high. You may still be able to see energy savings by using a VFD on your mixer, though, most likely, it will not be half.The VFD will only use the amount of current needed to mix based on the torque at the motor shaft. The motor develops torque as it starts, as the torque builds the drive sends more current and voltage as needed to maintain any increases in speed. Through parameters that you set in your VFD, you can adjust the speed that the mixer will mix at. We have many different drives available, some of which you can input the torque directly into the drive. If you are looking to maintain a specific level of torque you may want to look into using a drive capable of that, such as our A700 Mitsubishi drive.Thanks,Mackenzie

27/01/2015, 10:06:20 PM

Please suggest me VFD drive or any other for the following two Vacuum PUMP: 1) Model & Spec: ADS-602 By ALCATEL, 3KW, 3-PHASE, 400V, 5.5A.2)Model & Spec:DUO 65 Double stage, 3-Phase, 400V, 2.2KW, 4A.Application: Vacuum generation Please email me the suggested drive model.Many Thanks and Regard Izhar

28/01/2015, 08:06:00 AM

Izhar,We would be happy to point you in the right direction on your search for the right VFD for your application. I will send you an email shortly with a few additional questions I have for you.Thanks,Mackenzie

24/02/2015, 04:35:02 AM

Hi can u suggest for us three phase inverter 220V . +/- 10% voltage 36kw 220 motor 1200 rpm we need 25~100Hz. main shaft is pushing biomass briquette we need to protect inverter from being burned from overload.

Yin Tang:
25/02/2015, 10:30:00 AM

Hi Naif,We will send you some suggestions to your e-mail. Thanks!

21/03/2015, 12:46:49 PM

we have an VFD written U1: 3-380V I1-385 Amps U2-3-0-u10-320 Hz. I2 : 820 amps.Dooes this mean that the VFD is suitable for withstanidng a current of 385 amps or 820 amps Please advice

23/03/2015, 08:54:00 AM

Hello Balaji,Can you tell us what brand and model is your VFD?- Yin

Jinn Liong Chin:
30/03/2015, 11:39:47 PM

I have a 803KW motor with voltage 6.6KV and 86A. I have a ABB VSD ACS2000-066-A01K-J4-101, the max output continuous current is 86A. Is it ok to use?

07/04/2015, 10:19:00 AM

Hi Jinn,Sorry we missed your comment. Theoretically it will work as long as your VFD amp rating is higher than the motor FLA. However, depending on your application, you will likely need a little more headroom. You should consider going at least one size bigger on the VFD.For example, for applications that are constant torque, you will need 150% to 200% overload. Typically, manufactures will call it the heavy duty rating. For applications that are variable torque, you will need 100% to 120% overload. Typically, manufactures will call it light duty or normal duty rating.A constant torque rated VFD will have both heavy duty and light duty ratings. You will see something similar to "95/80A" or "95(CT)/80(VT)" in the specifications. You will need to determine if your application is constant torque (heavy duty) or variable torque (light duty), then match your amp rating accordingly. I hope that makes sense.

20/04/2015, 03:09:22 PM

Miller Dimension 452 welder, Volts. 230/460/575 3 phase Amperes. 90/45/36 kW 22.3 60 hertz Input.Would like to use it at home with available 120/240v Single Phase 60hz.

13/07/2015, 09:45:00 AM

Cam,You cannot run a VFD on your welder. Welders typically do not have a motor in them. They are more like a transformer. Also, this one already has a speedometer to control its speed.VFDs are decided to run motors. One of our engineers said to using a VFD to control a welder is like using a VFD to control lights. It will not work. I hope this helps. Sorry for the slow response.

24/05/2015, 12:09:33 AM

Is A pump motor rated: 25 Hp, 3-Phase, 230V, 60Hz can be serviced & run by a Single Phase, 230V 60 Hz power supply connected to Variable Torque VFD for motor rated 60Hp? Please advise if this possible prior purchase of VFD unit. Thanks.Miles

13/07/2015, 09:56:00 AM

Hi Miles,Yes it is possible but with limitations. You need to get a drive that is around 50 HP in order to accept single phase power. More accurately, you should double the amps of the motor instead of the horse power.You have to connect the VFD to the motor, with nothing in between the two and nothing after the motor. Any lights or switches will have to go before the VFD.Hope that makes sense. Thanks Miles.

Frederick Cox, P.E.:
09/08/2015, 01:39:04 PM

I do not have a hardware-specific comment or request at this time. Rather, I want to congratulate you on your thoughtful and authoritative responses to all inquiries. I was seeking confirmation that an oversize (40HP-rated) VFD drive would work with a 30 HP inverter-rated AC motor; Google led me to your website and I got the answer I needed by browsing your Q and A section. Thank you. You are now on my go-to list for future inquiries and specifications.

14/08/2015, 08:32:40 AM

I have a Sid Harvey 1/2 HP single phase, 1725 rpm motor for a furnace distribution blower. I'm looking to reduce the fan speed to quiet the blower and increase the run-time to eliminate short-cycling. I had a Danfoss VLT2800 given to me from a job site, can I use the two together?

24/08/2015, 02:22:45 AM

Can i use a 2 hp drive for my 0.75hp 3 phase motor to get 40rpm motor speed

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