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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62 views

Braking Methods of Induction Motor in VFD

As you know, we can stop an induction motor by plugging or regenerative braking. What I'd like to know is that when controlling induction motor with VFD, which braking way VFD uses? It seems to me ...
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2answers
60 views

How to Size Line Reactors and Understanding Reactor Specifications

I've got a 600 VAC, 75 HP VFD that I want to place line and load reactors in series with. Usually, I find charts like this that give me a horsepower table to follow as they are the easiest to use. ...
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1answer
54 views

Vcc drops on connecting variable resistor between it and ground

I have a VFD with a control board I am trying to fix. It requires an external variable resistor to be connected between the +10V terminal, analog reference terminal and ground. I found that on ...
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2answers
53 views

How VFD affects an isolated IOT system

To avoid noise from the external system I tried to isolate the internal completely. So I added DC-DC isolated converter with signal isolation. I have attached the picture. Still when reading data and ...
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3answers
115 views

Can a Variable Frequency Drive convert standard wall outlet (120V/15A/single phase) to ~220V 3 phase?

In my workshop I have a device that requires 220V 3 phase power, with a requirement of up to 1.5kVA. In North America, my wall outlet provides ~120V/15A single phases. (EDIT - my device can take +/- ...
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1answer
25 views

Slip Control vs Constant V/F Control for 3-Phase ACIM

I am trying to understand how is Slip Control different from Constant V/F control. If I need to control the speed of 3-phase ACIM then its slip would obviously change with its rotational speed then ...
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1answer
27 views

Speed control using direct torque control of induction motor

Is there any steady state error present in speed output at any load in direct torque control of induction motor?
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1answer
49 views

Voltage source & current input

I am working on a project where I have a current source (analog output from a PLC) controlling a VFD. Based on the position of the dipswitch, the VFD will accept either a current or voltage input. The ...
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1answer
75 views

Motor / VFD / Protective Earth

I have little experience with AC motors since I'm majoring in Mech.E. My team is setting up an AC motor with a VFD to control the movement of an airfoil inside a metal cage we built. I understand the ...
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1answer
47 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 ...
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2answers
102 views

Miscalculating the nominal power using nominal current and voltage of a VFD

A variable frequency drive datasheet has current parameters named as I2N and I2hd. If Im not mistaken these currents are the per line currents for the drive output as follows where I showed in red ...
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3answers
110 views

A very basic question about VFD output frequency

I know that a VFD's inverter stage creates alternating voltages at a desired frequency for the terminals of a delta induction motor(stator voltage freq.). Normally without a VFD the nominal freq. ...
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1answer
124 views

operating a motor with a undersized vfd

A centrifugal pump requires 21.6 hp to flow 350 gpm at 2800 rpm with a 230/460V, 40 hp, 2-pole (3600 rpm) motor. The VFD available can operate up to a 25 hp motor at 230V, with a maximum output of 68 ...
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1answer
38 views

DC bus correction for inverter VFD via PWM modulation

This is a question concerning an inverter circuit without PFC. Single phase AC is rectified and pooled on DC bus capacitors. From there the DC voltage is modulated at 5kHz on 6 IGBTs, emulating ...
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1answer
69 views

Why use many-pole motor for high speed?

I found in this teardown analysis of the Nissan Leaf drive motor that it runs up to about 10,000 RPM but is an 8-pole motor. My understanding is that the inverter cost goes up with frequency. The Leaf ...
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2answers
149 views

Powering a 3 Phase 230VAC Motor with 28 12V Batteries wired in Series

Mechanical Engineering student here. I'm a part of a senior project team that 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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1answer
99 views

Problem in temperature transmitter because of VFD (Variable Frequency Drive)

I made an amplifier of PT100 bridge which operates on 24V DC supply and gives 0 - 10V DC for 0 - 400°C when tuned. The circuit is as follows : Here P2 + and P4 S+ are shorted and P4 S- is left open....
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2answers
97 views

Not using all 3 phases of sine filter

I want to run a single phase motor with a single phase VFD. I don't believe that the motor is rated to run with a VFD. To compensate for the issue I would like to use a sine wave filter. ...
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0answers
90 views

Design temperature for an electrical control panel?

I am putting together an electrical control panel composed of small VFDs (like Siemens micromaster 440), PLC AB 1400 B etc, contactors, relays etc. What temperature and humidity should I design the ...
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0answers
33 views

PWM for ACIM scalar control

I have inherited a control software for ACIM scalar control and I need to do some changes in this software. Before I can do any change I need to understand current implementation. So I have started to ...
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1answer
91 views

Inductor Machines: why is constant flux achieved before reaching nominal speed?

It is observed that an induction machine increases its voltage linearly before reaching its nominal speed. This is achieved due to the emf generated by the rotor movement. However, I find it ...
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0answers
47 views

There exists 110v/60Hz motors as well 220/50Hz ac motors rating, what determines the voltage of an electric motor?

I have seen the Toms question and answers for what determines the voltage of an electric motor? None of the answers not fulfilling. I was not able to comment to get clarify my doubt, so I’m posting ...
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2answers
66 views

AC motor must be run off inverted DC?

I am looking at the datasheet for a motor. This is an AC induction motor designed for use in electric vehicles. It includes the statement [my emphasis]: The motors are designed for installation in ...
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2answers
53 views

PMSM control method

Is it possible to apply the so called scalar control or V/f control which is used for ACIM control also for PMSM control? I think no because of V/f control used for ACIM does not know current ...
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2answers
160 views

Run 1800 RPM motor at 3600 RPM

I have a 2”x72” belt grinder with a Brook Crompton bf4n.75-2 motor. It is connected to a Teco L510 VFD. Running here in the United States on 110v. My question is about turning up the RPMs sometimes ...
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1answer
142 views

Wiring a 2 pole three-phase DB motor to a VFD

Hello everyone this is my first time posting here so forgive me if my post seems a little choppy. So my dilemma is trying to hook up a 2 pole three-phase DB motor rated at 230 X 3. I did a fair amount ...
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1answer
42 views

How do you set up a VFD to run a motor at 2 different speeds?

I'm already familiar with the concept of altering the frequency to change the speed of the motor. So in this scenario, I'm looking into running a pump at 40Hz (high speed) and 23Hz (low speed). This ...
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2answers
77 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
75 views

What actually kicks in a VFD?

I am just getting into the plant environment and the first thing I noticed is that virtually all the motors are controlled by VFDs. I understand that your supply goes into your RST terminals and the ...
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1answer
143 views

Output voltage of 3-phase in / 3-phase out inverter

I am using UK mains (230 V phase, 400 V line) to drive a Japanese motor expecting 115 V phase, 200 V line), presently using 2:1 transformers. I would like to control speed between 30 and 70 Hz, ie +/- ...
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2answers
56 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 ...
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1answer
62 views

how to design AC line filter for VFD?

I am working on VFD for single phase induction motor. I am rectifying AC 220V directly to DC link capacitor. There is no LC filter from AC mains. There are harmonics in the AC mains. Can you suggest ...
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1answer
32 views

Polyphase motor with VFD

I purchased a dayton 1/3 hp 1725rpm and am wondering how to use it with a VFD. It says continuious as duty. I only have 220 at my house so I am wondering if i can set it up with a VFD and use it to ...
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1answer
142 views

Can VFD be used with induction motor for regeneration?

I want to use VFD with induction motor to run it as induction generator (driven by external prime mover). Does VFD circuit allow reverse flow of electrical power? Thanks
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1answer
151 views

Why even when we increase the synchronous speed, the slip still remains it's value? [closed]

This is an induction motor question: why even when we increase the synchronous speed, the slip still remains it's value?
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3answers
253 views

Using PWM instead of real DC for VFD's 0-10V control input

There is a VFD which controls an AC motor through a 0-10V control. I know that this control voltage is DC voltage. I'm wondering would a PWM work for this application? I mean instead of 2VDC, what ...
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1answer
52 views

Programming LS-iG5A

I have got this LS iG5A VFD to control speed of my rotary cutter machine. I have attached a momentary On/Off switch to start stop the motor and also connected a 10k POT to control its speed My ...
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1answer
1k views

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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1answer
133 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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2answers
182 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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1answer
530 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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2answers
2k 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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2answers
193 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
155 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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1answer
1k 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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2answers
426 views

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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5answers
747 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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1answer
110 views

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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1answer
164 views

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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2answers
141 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 ...