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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How does carrier frequency and pulse width modulation in a VFD work together to control AC motor speed?

There is a lot of online information about this but there is also a lot of contradictory information. What is carrier frequency exactly and does it stay the same or does it vary? I understand the ...
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432 views

Mega2560 master on RS485 bus stops communicating with VFD when I add another RS485 module

I’m doing a project where I’m building a control panel for a VFD (inverter/variable frequency drive). I’m connecting the two over half duplex RS485 and use Modbus RTU. As a master I use a Arduino Mega ...
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1 vote
2 answers
228 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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1 answer
1k views

Earth leakage tripping with 3 phase motor [closed]

I'm working in elevator world, i'm now in a strange situation. The 3 Phase synchronous motor is connected by drive then main controller and a distribution board. The faulty earth leakage circuit ...
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2 answers
4k views

How to measure output voltage and current of a VFD?

Is it possible to measure the output of a Variable Frequency Drive without relying on it's display data? I tried to measure the line voltage with a DMM and current with a clamp meter but it shows ...
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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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1 answer
266 views

EMI shielding for VFD and DC PSU's for CNC controller

The plan was to mount a VFD (Spindle) and (x3) 48V Power supplies on MDF and near it I want to mount 4 TB6600's for motion controlling a CNC machine. I would like to make it enclosed with some small ...
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2 votes
1 answer
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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How to modify winding of 3 kW 4 pole motor to run at 200 hz

Please guide me how a 3 kW 4 pole induction motor can be modified to run at higher frequency in the range of 0 to 200 hz. If the rotor motor is die cast copper. What should be done with present ...
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3 votes
5 answers
821 views

what are the implications of using a 45kW ACS580 ABB VSD on a 22kw induction motor?

What are the implications of using a 45kW ACS580 ABB VSD on a 22kW induction motor?
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Is there a way to overdrive a single phase, capacitor start, AC motor?

I have an AC system that runs on single phase 120v AC. The "motor" is a hermetically sealed compressor, fractional horsepower. It has a single capacitor about the size of pill bottle. Based on that, I ...
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Are there safe ways to run an induction motor rated for 50/60 Hz at a lower frequency?

I have an induction motor that is rated for 50/60 Hz, with full-load amperages of 1.85A / 2A respectively. It is not rated for any other operating frequency. If I connect it to a VFD, will it be safe ...
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  • 547
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2 answers
281 views

VFD? to power aircraft non-motor/inductive load OR power conversion [closed]

QUESTION: Is it plausible to test power, out of aircraft, a mostly solid state device ie Microwave Oven? Can a VFD be programmed to run with inverter circuits. If so, 3 phase + ground output of VFD is ...
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0 answers
148 views

Why Fault pin of IR2136 gate driver is getting low at high voltage?

I am implementing a variable frequency drive for a three-phase induction motor. I used IGBT module fs25r12w1t4 with gate driver ( three phase, six Channels IR2136). When I increase the voltage, the ...
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3 answers
1k views

power to a 230v three phase motor

a. Is it possible to run a 230v three phase motor with a 115v input VFD? Where does the other 115 volts come from in this case? b. How would I size the VDF for this case. I know my VFD will need to ...
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2 answers
652 views

Slip ring (wound rotor) 3 phase motor, what VFD should I use? [closed]

I'm trying to solve some puzzles around the electronics of an amusement ride. It's basicly an old carousel with a wave-like pattern (3 tops/downs along the circle) that i'm restoring. (So that you ...
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4 answers
294 views

Does this type of Dual Voltage AC Drive exist?

The goal is to run a 3ph AC motor with either high or low voltage inputs. The motor would be wired for a specified voltage and the controller drives a single output regardless of the line voltage. I ...
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1 answer
127 views

why fs25r12w1t4 infineon module is burnt out when high current is paassed through it?

I am implementing a VFD for Induction motor drive. I have used fs25r12w1t4 Infineon IGBT module ( 1200v 25A) with gate driver 6ed003l06-f2. It always burnt out when I passed 2A current. What may the ...
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0 votes
2 answers
4k views

Condition for max torque

My questions are these: If say a 3ph motor connected to a mains supply is rated at 1400 rpm with no load at what rpm approximately does it produce its max torque? If the same motor is run with a VFD ...
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3 answers
73 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 (...
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2 votes
2 answers
1k views

Should a frequency-controlled motor use a circuit breaker with a B or C trip characteristic?

In our company, a discussion is raging on whether a motor with a frequency controller should be protected with an automatic circuit breaker with B or C characteristic. The B-camp's argument is that, ...
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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 ...
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Question about earth grounds for remote control of VFD via a DAQ system

A single-ended earth grounded PCI data acquisition board's analog inputs and outputs are controlled by a PC. The daq board has also analog outputs. One of the analog output is controlling the motor ...
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670 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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-2 votes
1 answer
734 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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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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0 answers
301 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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2 votes
1 answer
609 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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3 answers
823 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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1 vote
1 answer
242 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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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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4 answers
888 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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1 vote
3 answers
5k 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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524 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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3 votes
4 answers
160 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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2 answers
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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1 answer
129 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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-1 votes
1 answer
114 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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2 votes
2 answers
98 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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0 votes
2 answers
6k 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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1 vote
3 answers
6k 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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2 votes
2 answers
519 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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0 votes
1 answer
611 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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2 answers
6k 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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0 votes
1 answer
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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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3 votes
1 answer
61k 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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3 votes
1 answer
543 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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1 vote
1 answer
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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0 votes
2 answers
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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0 votes
1 answer
519 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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