Questions tagged [vfd]

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

Filter by
Sorted by
Tagged with
0
votes
0answers
37 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 ...
0
votes
1answer
37 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 ...
2
votes
1answer
457 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 ...
1
vote
2answers
160 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 ...
0
votes
2answers
46 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 ...
0
votes
2answers
586 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 ...
2
votes
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 ...
1
vote
1answer
54 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 ...
0
votes
0answers
23 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 ...
0
votes
2answers
16k 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 ...
0
votes
0answers
26 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 ...
3
votes
2answers
222 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 ...
0
votes
0answers
18 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 ...
1
vote
1answer
1k 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 ...
4
votes
3answers
357 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 ...
0
votes
2answers
275 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 ...
0
votes
1answer
186 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 ...
0
votes
1answer
48 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 ...
0
votes
1answer
99 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 ...
1
vote
2answers
44 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?&...
1
vote
2answers
63 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 ...
2
votes
1answer
107 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 ...
1
vote
1answer
23 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 ...
0
votes
1answer
41 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 ...
1
vote
1answer
202 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....
3
votes
1answer
7k 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 ...
1
vote
1answer
55 views

Why are inverter modules extremely oversized in VFDs?

I was checking a faulty Schneider VFD (ATV312H037N4) which is rated for a nominal output current of 1.5 A. Turns out the rectifier bridge of the inverter module (FP10R12YT3) blew up and after reading ...
0
votes
3answers
63 views

Powering three separate shaded pole axial fan motors with one 3-phase VFD

I want to power and control the RPM of three 115v .47amp shaded pole axial fans each powered by a separate leg of the 3-phase coming from a VFD. Can it be done? I'd like them to run at full speed (...
1
vote
2answers
9k views

How to calculate RPM using frequency

I am working with VFD (CT-2002ES-A75). It shows output frequancy on it's seven segment display. However It has a parameter(Cd46 on page 27 in the manual) for display the current RPM of the motor. For ...
3
votes
3answers
93 views

Which frequency is the best for a 3-speed Motor?

Sorry I dont know the appropriate terms that should be used in this subject! I have an inductive motor, it has 3 different speeds (or windings) at 50 Hz: 350 rpm / 700 rpm / 970 rpm I want to ...
0
votes
1answer
40 views

Explanation request of a paragraph in a VFD manual about a diode, should I add it or not?

I didn't fully understand this paragraph in a VFD manual: My question is: is the free-weeling diode exist inside the drive, or should I put an external one?
0
votes
2answers
146 views

Converting single-phase 120 V or 240 V into three-phase 4-wire 120/208 V

I am needing to convert either 240 V or 120 V single-phase into 120/208 V three-phase 4-wire. The load needed is 30 A. My panel can supply up to 100 amps, so the amperage isn't an issue. I've looked ...
1
vote
2answers
207 views

Does a 3-phase VFD work if one phase is reduced (e.g. with a dimmer)?

If you have a 3-phase VFD running a 3-phase motor, and you use a leading or trailing edge dimmer on one or two of the input phases, will the VFD continue to operate normally, pulling more current from ...
1
vote
1answer
46 views

suggestions for how to implement a weird VFD jog mode?

I'm a total noob at electronics, but my employer has asked me to try to program a replacement VFD on our industrial stone-cutting saw. Everything works on it now, but I need to figure out how to ...
2
votes
4answers
135 views
3
votes
3answers
1k views

How many times of a frequency of a PWM can properly generate a sine wave to drive a motor?

I know PWM with dense and loose duty cycle is used to generate sine wave for applications such as 3-phase motor driving. But, How fast does it require to properly generate a sine wave to drive a motor?...
0
votes
1answer
106 views

Using a 3-phase Transformer After a Variable Frequency Drive for Voltage Reduction

In the plating industry generally 42V - 3P motors are used to rotate the barrels that hold the products to be plated. This is because the contacts of the barrel cannot be isolated (because barrels are ...
0
votes
1answer
30 views

Firing time in VFD inverter

Just a quick one. When looking at schematics for a VFD, I see the same circuits as diodes used in the converter (AC to DC), capacitors in the DC bus and transistors or thyristors used in the inverter ...
1
vote
2answers
86 views

How much is the permeability of this attached inductor core?

I want to use this inductor for AC line filter as line reactor. Its inductance value is 6 mH but I don't know the exact value of permeability of the material. It will be used with VFD at the input to ...
0
votes
1answer
44 views

Does a load reactor eliminate the need for EMC cabling?

The company I work with installs ventilators driven by VFD's. To save on cost of EMC cabling we use load reactors at the VFD outputs. (Other considerations for not using EMC cabling have to do with ...
0
votes
0answers
52 views

VFD configured for six-step output instead of SPWM?

I need a transformerless inverter which generates a 3 phase 230 VAC modified sine wave output from 325 VDC input. Unfortunately, it seems these are rare, at least high power models. Can a VFD (with DC ...
1
vote
0answers
713 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 ...
1
vote
1answer
83 views

VFD as general use inverter

I'd like to have 3ph 208 in my house for general use (not a motor). If I run the output of a single phase to 3 phase VFD through inductors or a 1:1 transformer will it smooth the SPWM .output into an ...
0
votes
3answers
328 views

Can we use a power amplifier (Class AB) in the inverter portion of a VFD?

I would like to float this idea of using a good (audio) power amplifier in the inverter stage of a sub 1KW VFD. How does this idea sound ? On the plus side, there is far less switching noise, since ...
0
votes
2answers
109 views

Parameters of the 3 phase geared induction motor

I have a 3 phase geared induction motor. The name plate is below image. I couldn't find any datasheet from internet. Explain me parameters that on nameplate for entering to VFD. I need to know Rated ...
0
votes
1answer
60 views

Can I operate a 500kW/1500rpms motor at 35Hz with 400kW inverter?

In stock we have a 3 phase induction motor with a rated power 500kW and 1490rpms. What is the smallest frequency inverter which we can use to operate this motor in a machine with a maximum power/...
1
vote
2answers
36k views

How to wire 3 phase motor to VFD

I am trying to wire a new motor to a variable frequency drive (VFD) and having some trouble figuring out how to wire the motor to the VFD. The motor is a 1 HP, 3-phase, 208-230/460 volts, and I'm ...
1
vote
1answer
107 views

Variable Frequency Drive with AC motor, 30kW

I have a VFD that controls an AC motor which compresses air. It is an 30kW motor. I have set the parameters required to drive the motor and it runs the motor but not properly. During the test the ...
0
votes
2answers
1k views

Why this pair of IGBT's died silently?

Before some days I have taken a look at circuit which controls AC current's frequency. That circuit was a VFD which looks like: simulate this circuit – Schematic created using CircuitLab But ...
0
votes
1answer
212 views

Termination of SY cable shield at VFD and 3 phase motor?

I am wiring a single to 3 phase VFD to a 3 phase motor (240V delta). The 3/4HP motor powers a lathe in a domestic setting. Supply voltage is 240V 50Hz. As per the VFD instructions, I am using ...