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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566 views

VFD IGBT blew up and I can't find a replacement part

So here’s my situation, a few weeks ago I received a 2.2kW variable frequency drive from a chinese seller and it worked perfectly. I then watched a video on youtube by AvE where he takes one apart (...
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1answer
649 views

How to connect to the inverter with motor [closed]

I have a motor and a inverter (CT-2002ES-A75). Motor nameplate is: How should I connect the motor to inverter? What are the special parameter in the inverter that should I change according to the ...
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3answers
1k views

why three phase induction motor draws current with spike at low frequency by using VFD?

I have built Variable frequency drive (VFD) for a three-phase induction motor using V/F constant control. while I was testing 15HP three-phase induction motor without load with my VFD, the motor draws ...
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0answers
279 views

Filtering variable-frequency-drive noise by an RFI filter

We are having random noise issues on PC controlled data acquisition where one is related to VFD drive which is controlling the AC motor. The thing is that, sometimes we observe continous large noise ...
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1answer
489 views

Is it possible to connect a phase control relay to an inverter (VFD)?

Is it possible to check a motor ON/OFF state by connecting a phase control relay to the inverter and the motor 3 phase terminals? I have tested a phase monitoring relay to a main 3 phase supply from ...
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3answers
727 views

A simple way to detect an AC 3 phase induction motor ON/OFF state

Background: There is a 3 phase motor running by an inverter. motor specification is about 1.8KW power and 230/400V and 1.13A. I want to drive another DC motor synchronized with that AC motor so the ...
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1answer
220 views

Induction motor scalar control

I have been developing a software for scalar control of three phase induction motor with squirrel cage rotor. This control method is based on voltage-frequency characteristics of the motor. The used ...
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1answer
84 views

When supply fan VFD starts up it causes communication problems for my energy management controller

We have an energy management system that controls the air handlers for a building. I have one unit that when the supply fan VFD starts up it cause the unit controller to start having communication ...
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4answers
756 views

Running a 15HP Motor with a 30 kW VFD

We are going be buying a 15 HP motor, and using a VFD we have, currently not doing anything. While I'm told that typically, you buy a VFD for the Motor (i.e. 15 HP Motor + 15 HP VFD), we couldn't let ...
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3answers
4k views

How to determine full-load RPM of an induction motor at any arbitrary frequency?

Lets say an induction motor's spec sheet states the following: 1/ 50 Hz, 2-pole, full-load rotations-per-minute (RPM) = 2850. 2/ 60 Hz, 2-pole, full-load RPM = 3450. Can we extrapolate this ...
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1answer
371 views

What is the best and cheapest load to test a variable frequency drive at full load?

what is the best and cheapest load to test a variable frequency drive (1 HP VFD) at full load? Maybe a centrifugal pump ? Thanks in advance
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4answers
144 views

Can I use a VFD to send power of a specific frequency to a frequency meter?

I have a beautiful old frequency meter from a power station, a "System Frahm" type panel based on vibrating reeds. It has two rows with 21 reeds in each, each going from appx. 45 Hz to 55 Hz. It says ...
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2answers
1k views

VFD: Regenerative overvoltage trip during deceleration or stop

I have a Mitsubishi VFD Model: FR-F720. It shows the error E0u3, which means according to the manual: "If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed ...
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1answer
124 views

At which set point (frequency) will a VFD dissipate the most heat? [closed]

On a typical application for a variable speed centrifugal pump, at which percentage speed setting will the VFD dissipate the most heat, in other words have the highest losses?
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1answer
113 views

Converting Single Phase Mains into 3 Phases (No VFD) [closed]

I have a goal to build a circuit from scratch to simulate a 3 phase motor. I do not have any specific requirements, rather, I want to make sure that I understand what is wrong with my approach and ...
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2answers
91 views

How can I tell if a cable is rated for use as motor leads with a variable frequency drive?

I understand that the switching edges generated by a VFD can cause corona breakdown of the insulation on the motor leads. Due to this, it is recommended that some cables be used for VFD motor leads, ...
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2answers
5k views

How to calculate the DC rail voltage for Variable frequency drive (VFD) for single phase induction motor?

I am working on VDF for Sigle phase induction motor. I just want to compute the total voltage of single-phase induction motor that will need to create from DC link. I am not sure about the calculation....
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3answers
5k views

Connecting a 1.5 KW VFD to a 2.2 KW motor

Today I saw a setup in a factory in which a 2.2 KW 3 phase induction motor is connected to a 1.5 KW VFD. The motor plate: the VFD plate: The motor is connected to a gearbox (the transmission ratio ...
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2answers
485 views

Can I drive a three phase induction motor with this method?

I have an idea to drive induction motors in a new way. I call it Variable Torque Drive (VTD). You are all familiar with VFD which utilize variable frequency and try to keep the torque constant. This ...
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1answer
538 views

Rewiring AC motor with 8 wires to vfd [closed]

I am helping a friend who has an AC motor that was originally wired to run on 220VAC but from the looks it is wired to use two capacitors to (somehow) convert a single phase to a 3 phase... the goal ...
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2answers
5k views

In VFDs, could motor current parameter be set higher than the actual motor's current? [closed]

What could happen if 0.5 hp motor is connected to 7 hp VFD with the motor current parameter set to the maximum value of the VFD? let us say 14 Amp. How could that affect the motor? The current ...
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1answer
801 views

Operating a 60 hz Induction motor at 50 hz

If i had an Induction motor that runs on 460 volts ,35 amps , develops a power of 35 hp at a speed of ~1800 RPM ( data acquired from a nameplate ) How is it possible to calculate the same parameters ...
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1answer
54k views

Why choose delta over star connection for a 3 phase motor with a VFD?

With respect to a particular application, why is it better to use a delta connection over a star? I have a motor/pump hooked up to a vfd in delta. For my application, Im required to adjust the flow ...
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1answer
475 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
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 ...
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2answers
1k views

VFD or gearbox for Linear Actuator?

I'm designing a linear actuator for a particular application, and the electric motor I'll be using will be a 1/8 HP three-phase motor. I need to decrease rotation of the motor, and my first idea was ...
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1answer
475 views

Will VFD provide enough startup current for induction motor under full load?

I have a a 3-phase AC induction motor with the following ratings: rated power: 0.75kW rated current: 1.65A rated voltage: 3x400V rated torque: 5Nm supply freq: 50Hz start/rated current: 7.0 Will a ...
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1answer
146 views

how do I change a Ultra High voltage AC currents frequency?

I am currently making a theoretical tabletop particle accelerator. and i need the materials in the accelorator to be resonating together at a set frequency (Whcih I can change to test speicific ...
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5answers
13k views

Tesla Car “maximum torque at 0 RPM” - is this correct?

Tesla Model S Wiki I've been watching youtube videos on this car, and everyone states that the crazy accelleration is due to maximum torque at 0 rpm. Doing further research, this car uses an AC ...
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1answer
257 views

Which terminal do I hook the panel ground wire to on my VFD?

Have the TECO 7300CV - 220v single phase in, 220v three phase out. The manual clearly shows the motor ground connection going to the "PE" terminal but it does not show the source / panel ground ...
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2answers
111 views

How can earth fault meter work through inactive IGBTs

I have a setup with a Bender IRDH375 connected to the DC bus of an IGBT based inverter. If I connect a 50kOhm resistor to earth while running the inverter, it detects it well. That part is reasonably ...
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2answers
165 views

Advantage of PWMs over an Oscillator based Induction Motor Drive

Variable Frequncy Drives commonly use pulse width modulation to generate frequencies for driving induction motors via the use of microcontrollers. Is there any advantage to using MC based PWM signals ...
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2answers
2k views

Induction Motor Power Factor with Variable Speed Drive

I know something about pumps, but less about the motors which drive them and am looking for some help in this regard. The motor in question is a three phase two pole squirrel cage induction motor. I ...
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1answer
615 views

I too want to wire a 3 phase motor to a VFD. And the question has already been asked but

How to wire 3 phase motor to VFD http://i.stack.imgur.com/KmuB3.jpg My Baldor vm3556t 1hp motor shows the same wiring as the photo above and the wires are bundled as shown on the low voltage side. My ...
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2answers
228 views

Filtering kHz noise

I have a variable frequency drive (VFD) that switches at 3kHz, according to the datasheet. I also have a sensor that has a pulsed 5V signal output. Here are the three data points I've collected: VFD ...
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2answers
63 views

VFD output connection related query

What will happen in an VFD if any two terminal of the output power given to motor (R,Y,B) are interchanged
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2answers
684 views

V/f Constant control for single phase induction motor?

I am implementing a Variable frequency Drive control of single phase induction motor. I am little bit confused about the V/f ratio and voltage level. i boosted voltage upto 380V for Inverter . if i ...
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1answer
5k views

What functions do EMC filters in variable frequency drives serve?

Most VFDs I've seen have EMC filters in them, though in many cases they're optional or can be disabled by the user. Exactly what function do these filters perform? What problem are they intended to ...
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3answers
371 views

What would be the options to supply a 3-phase motor without using the power lines?

If we have a 3-phase 600A, 400V AC induction motor with a VFD. Are there any techniques to supply it with a huge acu/battery or a generator. This is to use when electricity is gone or no power network ...
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6answers
699 views

Controlling the frequency of AC used to energize an electromagnet

I am trying to build an electromagnetic pendulum which essentially has a pendulum arm with a permanent magnet at its end which is 'kicked' by an electromagnet placed at the mean position to drive the ...
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1answer
267 views

VFD Power Savings physical explanation - cubic vs square relationship

I am trying to either explain or derive where the power savings come from with a variable frequency drive (VFD). I am well aware of all the literature and generally accepted assumption that energy ...
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2answers
993 views

From PWM Output to Large Motor Control

This question stems from my own curiosity, so forgive any vagueness. Imagine the following scenario: We have a MCU which outputs a PWM signal to control a motor's speed and direction. We ultimately ...
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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 ...
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3answers
1k views

DC Bus Conditioners in VFD Drives

In VFD Drives, DC Bus conditoners are used to protect the DC link supply from transients. Can you please let me know the different scenarios DC Bus of a VF Drive gets these transients and their ...
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1answer
3k views

CAN protocol : How to start with CAN interface with Microcontroller [closed]

I want to communicate with VFD (variable frequency drive) via CAN open protocol. I have never used CAN before. So can anyone Guide me from where Should I start with ? Any link or Suggestions would ...
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1answer
103 views

Does the RoHS standard apply to variable frequency drives?

I'm having a bit of a disagreement with a customer about whether RoHS applies to variable frequency drives and comparable equipment. This is complicated by my understanding that RoHS is being rolled ...
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1answer
199 views

Starting the VFD from a specified frequency instead of 0 Hz [closed]

I have Hyundai N100 inverter. PLC is sending 0-10V analog signal to the inverter. It starts from 0 Hz and then reaches the maximum frequency of 50 Hz. Now i want it to start from 40 Hz instead of 0 Hz ...
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2answers
58 views

Why there is continuous variation in output frequency of a Hitachi Inverter (L100 Series)? [closed]

I am using a Hitachi L100 Series inverter and its frequency source is Keypad Potentiometer. During run it is continuously changing the output frequency which is displayed on the Operator Display ...
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3answers
360 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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1answer
572 views

variable frequency three phase AC

I want to generate 1-150Hz+ three phase AC. Output voltage at maximum frequency would be around 240VAC and current around 40A. I have a few 60Hz three phase induction motors, drive shaft coupler, and ...