Questions tagged [vfd]

Variable frequency drive, a three-phase AC output motor controller. Questions about vacuum fluorescent displays should not receive this tag.

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What Happens if Uncharged VFD is Connected to Charged DC Bus

if the dc fuse of the uncharged drive is closed when the dc bus of other drives is charged , what happens ? Is there any risk of damaga capacitor ? As I know, capacitor can stand to very high currents ...
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2answers
61 views

Why it is required to fuse each inverter in common DC bus

I have four variable-frequency drives (VFDs) in total supplied from one largest VFD in system. The other three VFDs don't have connection to ac grid. These three VFDs are supplied from common DC bus. ...
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71 views

VFD max current rating less than motor peak current - problem?

Whats the worst that could happen if using a QUALITY 8amp VFD - single phase input, 230v, vector controlled - on a industrial 3 phase motor with peak current rating of 50 amps. Do VFDs have the ...
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1answer
27 views

YL620 VFD terminal strip is small - wires are big. Connector options?

I'm attaching input power (240V single phase) and motor load (3-phase, variable frequency) wires to a terminal strip of a Variable Frequency Drive controller (YL-620). The power rating for the device ...
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2answers
56 views

3 phase motor VFD frequency / current draw help needed?

I am planning to covert a 1920 Drummond B type lathe to 3 phase motor / VFD combo and am trying to understand the math involved with VFDs mainly relating to frequency and current draw. How do they ...
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2answers
59 views

Help choosing 3 phase motor and VFD for mini lathe project

I bought a 101 year old mini-lathe (Drummond B type) and from what I've seen and read online it should be possibe to bring this lathe into the 21 century. In my most extreme vision I would like to ...
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2answers
42 views

How can i choose the right VFD for an electric motor?

I have a 1.5kW three phase electric motor that is in a delta configuration. This motor has a motor voltage of 230/400V and a rated current of 5.9/3.4A. What sort of VFD should i be looking for that ...
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34 views

Use closed loop torque control based on motor position to simulate a dynamic load

The goal is to use servo + gearbox to simulate a screwing process millions of times. A screwing process is characterized by a low torque at first (the screw enters the material) and once the screw ...
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2answers
262 views

Tesla Model S inverter DC bus voltage

I was recently researching about this Telsa electric car inverters where i found one intresting thing. Usually in the voltage source inverter the DC bus voltage will be around 600 to 650 V considering ...
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2answers
63 views

Table jitter on 40 ft planer mill at certain low feedrates with new 40 hp 3-phase motor and 50 hp ABB drive

The display on the drive shows 26 amps with little variation at all speeds. At 176.14 RPM it shows -9.2% motor torque, 25.63 amps. At 977 RPM it shows 26.04 amps and 2.4% torque. The motor spec ...
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1answer
32 views

Induction motor 'droop control' on multi-motor coupled loads

When using droop control to balance the torque across multiple motors driving a coupled mechanical load such as a chain conveyor, what is the actual variable that is being altered by each drive? From ...
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2answers
215 views

What is the recommended way for starting an ac induction motor with a VFD?

I am designing a control strategy for an AC(induction) 3-phase motor fan in an HVAC air handling unit for pressure control inside the ductwork. The plan is to use a PID algorithm for the pressure ...
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3answers
1k views

Why do variable frequency drives (VFDs) need so much information?

I'm an electricians apprentice at a mine. I understand the basic operation of variable frequency drives (VFDs), rectification, filtering, and pulse width modulation. But, at the heart, all they're ...
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42 views

Ramp up voltage on a small AC train motor

I am looking to start older electric trains that run off an AC transformer at a gradual ramp up of the voltage when coming out of a block signal area instead of starting at the last voltage set on the ...
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1answer
487 views

Testing an induction motor with a VFD, difference in voltage and mechanical power vs electric power

I have question about a electro motor powered by a frequency regulator. It is the first time I did some test on a frequency regulator on school. This are the parameters of the motor The motor is ...
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1answer
41 views

Pole counts for VFD driven induction motor

What is the significance of pole count of IM if it is driven by a VFD? If we are using the power supply frequency (50Hz or 60Hz), the pole counts matter in terms of torque and synchronous speed. But ...
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2answers
1k views

isolated 5v PWM to 0-10V

I'm trying to convert a 5V PWM signal to 0-10V through an optocoupler to drive a VFD. The output "0-10V" should be 0V when PWM duty cycle is 0%, and 10V when 100% (linearly !). Here is what I've come ...
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378 views

Motors Delta/Star connections to VFD

I've selected 230/400V motors (delta/star) and corresponding 400V VFDs for pump motors. Now I've been asked why I haven't selected 400/690V motors (delta/star), that are the standard and usually ...
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2answers
744 views

VSD (Inverter) current measurement on 3 motor phases

I'm working on a project to build a rig for testing various sized Variable Frequency Drives (VSD's / inverters), the kind that you'd use to run a squirrel cage induction motor. The range would be from ...
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1answer
31 views

What would cause DC bus voltage on my VFD when the disconnect is off

125 hp 480 vac HMax VFD. Controlling a pump motor. Motor is not spinning and line to the VFD is disconnected. I was putting the output wires back on the VFD, when moving the second one into place, ...
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1answer
37 views

Building a VFD for a split phase (capacitor run) motor?

I'd like to get variable speed on a very tiny lathe (Taig, 4" swing). I've got a dishwasher motor I'm planning on using for it, which is rated for 3600rpm at 60Hz (it's about 1/5HP). But it's a ...
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4answers
974 views

Can I run a VFD off a generator?

I want to power a three-phase 5hp well pump with a VFD. I want the VFD both to serve as a soft start, and to allow variable speed operation of the motor. Two different pump salesmen have told me that ...
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2answers
1k views

Powering a 3 phase 230VAC motor with 28 12V batteries wired in ceries

Mechanical Engineering student here. I'm a part of a senior project team that is trying to run a 40 HP 230 VAC three phase motor with a 40 HP VFD for a hydraulic pump. Our plan is to wire 28 lead acid ...
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47 views

Why does reciprocating compressor's motor starting winding have high voltage than running winding

I want to know why the starting winding of (2 ton) reciprocating compressor's motor have high voltage than running winding? I have attached the voltage that I have captured from oscilloscope. This ...
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3answers
95 views

EMC Cable shield used as PE wire, great idea or not?

In order to save on cabling, our company uses 3 wire EMC cables to connect electric machines to their VFD's. Some folks in our company think we should really use a dedicated ground wire, many are of ...
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1answer
47 views

How do VFDs limit the starting current of the motor?

I have a 5 HP three phase motor. I am going to install a variable frequency drive (VFD) for speed control. I know that VFDs are used to soft start motors. How do VFDs limit the starting current of the ...
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26 views

Is V/F maintained constant even in field oriented control or vector control drive of PMSM motors?

I understand that in scalar control V/F is maintained constant below rated speed, as Vector control drive is also a variable frequency drive, I would like to know whether V/F is maintained constant ...
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42 views

Old VFD clocks and wired button problem

So, my friend stumbled across this old article: https://steemit.com/electronics/@gleb-jeglov/how-to-make-a-vfd-clock-step-by-step He gave me couple IV-18 tubes and asked me if I can make similar ...
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1answer
52 views

VFD and motor compatibility

I am looking for a VFD. The motor has following specifications:Motor nameplate YE2-1329-4 and JB/T11707-2013 5.5 kW, 400V, Δ, 11.3 A , 50Hz, CosΘ 0.82, IP 55, 1460 rpm, 87.7. Is above motor ...
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69 views

380V Wye on motor nameplace,VFD manual requires 220V delta. Will it work?

I removed a motor (nameplate attached) from an eddy current drive. My intention was to replace the controller with a VFD and remove the clutch assembly. The motor obviously ran at full speed with each ...
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1answer
2k views

Running a 3ph motor rated for 380v star on 220v delta

I've got an old Soviet 4kW motor, made in 1983. The dilemma is that the nameplate info states a Y-connection/380v/8.7amps and I want to run it on delta using my VFD which produces 3ph 220v. All my ...
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63 views

Maximum Voltage That Can be Applied to a Motor

I was reading about 87Hz technique. I saw we can configure the drive for a motor 400Y/230D as 400V /87hz. I know v/hz ratio should be kept constant and when we configure drive as 400V and 87 Hz and ...
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28 views

Measuring voltage in VFD

I an troubleshooting my chiller because I fried my compressor. I have done clues of what could go wrong, but want to discard over voltage. I have a Mitsubishi VFD. That I take 240 and convert to 240 3 ...
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2answers
18k views

Startup current of an induction motor when using VFD

A 3-phase AC induction motor has the following ratings: rated power: 130kW input power: 140kW rated voltage: 3x400 V rated current: 270A supply freq: 50Hz there is no soft-start The motor will ...
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37 views

Effect of PWM output from Variable Frequency Drive to PSC motor

I looked at VFD diagram and seem like it use Sine-PWM Output without any filter to drive psc single phase ac motor Inductance and capacitance seem to work with pure sine wave but PWM output have a lot ...
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2answers
238 views

How to choose and wire a Variable Frequency Drive [closed]

I have a 1.5 HP 3PH 240V Leeson motor that I want to drive my lathe, but I want to vary the speed. I asked a question on this site about a month ago about how to do that and the recommendation was a ...
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20 views

What scheme would you indicate for a nobreak system with variable frequency output?

I'm pretending to make a system that charge batteries (or a single battery) and then produces 3 independent AC outputs (all having the same common, in a star connection). But I want to have ...
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1answer
2k views

How to determine a Permanent Magnet Synchronous Motor (PMSM) Nameplate?

I have already built a three-phase Permanent Magnet Synchronous Motor(PMSM) and wanted to use a VFD in sensorless vector control mode to run it. Now I want to figure out the characteristics of my ...
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3answers
362 views

Motor Induction motor design specifics

I wanted to know the difference between the motor(s) used in the Tesla Model-S and commercially available motors. (source: insideevs.com) eBay Motor^ I have been very confused. They both are ...
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2answers
316 views

Replacing an old 2 speed rotary cam switch with VFD

I bought an old drill press tnw super condor 30l but the motor smoked because of the rotary cam switch is broken. The drill is old and the motor have no motor plate but few engraved numbers 380 and 20 ...
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1answer
613 views

Understanding VFD speed control input using a potentiometer

I am working on hooking up a potentionmeter as a speed control input to a variable frequency drive. Here is are the diagrams from the VFD manual: (Its a Lenze AC Tech SMVector ESV112N01SXB; full ...
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1answer
65 views

VFD Motor Bidirectional Control

So I have a control panel which controls the speed and direction of a motor in a sliding mechanism. the direction can be inverted using a tri-state selector on the panel. the selector input is a ...
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1answer
217 views

VFD for a 3-phase delta-connected 415V~ motor

When a motor starter is to be replaced by a 3-phase 415V~ VFD, can the existing motor be used without changing its winding configuration (star/delta)? The motors are from different manufacturer ...
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46 views

What exactly is 1.x and 2.0 power scalar V/f control in VFDs?

These are terms that I have come across in multiple operating manuals for VFDs and usually, they just mention that it's used for variable torque applications. My doubt is "what exactly is it?&...
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2answers
66 views

Is upsized reactor allowed for the comparitively less motor HP?

We have a LV-MCC in our commercial outlet having a 480 VAC, 15 HP VFD with line and load reactors in series with it. The VFD is sized for 22.0 A (normal duty), the motor has a horsepower rating of 10 ...
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1answer
24 views

Delta Servo Drive 220V/400V Series

ASDA-A2 Delta Servo Drives including two types: 220V and 400V series that it seems the difference is input voltage of the Servo Derive. but i doubt 220VAC or 400VAC is line to line voltage or line to ...
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1answer
48 views

AC Induction Motor Slip and Torque control Vs V/f control

I am trying to understand this github code for speed control of AC Induction Motor. It calculates slip value to adjust the speed of motor. I wonder if its the same thing that is called constant V/f ...
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1answer
307 views

4-20 mA output from Arduino for VFD

I'm a beginner with electronics, so everything has to be explained in simple terms to me. I have an Arduino with a program which provides a value via the Analog output, so that is anything from 0-5 V....
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1answer
8k views

Can you use a vfd to run a capacitor start motor?

I've read on many forums, publications and specification sheets that it's not possible to run a capacitor start motor using a VFD. The start winding of such a motor is momentarily powered until the ...