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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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1answer
67 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
45 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
47 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
45 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
15 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
35 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
70 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
69 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
39 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
318 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
44 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
163 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
257 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
591 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
73 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
103 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 ...
2
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1answer
339 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
241 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 ...
3
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4answers
700 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
80 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 ...
0
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1answer
89 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
100 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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0answers
51 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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3answers
174 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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2answers
161 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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3answers
82 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 ...
0
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1answer
68 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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2answers
834 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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2answers
50 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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2answers
112 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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2answers
2k 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 ...
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0answers
43 views

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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0answers
56 views

A question about VFD earth ground

As part of my investigation on noise issue from this VFD drive, I was trying to understand how the earth connections made. The following figure is from page 25: Im trying to check whether the drive ...
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4answers
178 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
86 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
455 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
113 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 ...
2
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1answer
153 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
396 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 ...
1
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1answer
98 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 ...
0
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1answer
48 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
242 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 ...
1
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3answers
1k 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 ...
0
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1answer
96 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
3
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4answers
97 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
410 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
83 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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votes
1answer
100 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 ...
2
votes
2answers
72 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
3k 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....