Skip to main content

Questions tagged [vfd]

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

42 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
2 votes
0 answers
188 views

Why does reciprocating compressor's motor starting winding have high voltage than running winding

I want to know why the starting winding of (2 ton) reciprocating compressor's motor have high voltage than running winding? I have attached the voltage that I have captured from oscilloscope. This ...
Fame's user avatar
  • 21
1 vote
1 answer
28 views

single phase into vfd

I have a three phase in three phase out vfd which is rated for 230V. I would like to use it to power a three phase motor. The manufacturer of the drive states it will run from a single phase input, ...
Simon Mclennan's user avatar
1 vote
2 answers
57 views

Cable current rating for high frequency applications

I am looking for power cables for high-speed motors, with frequencies up to 700Hz. All the tables that I find online are referred to 50/60Hz applications. I am not able to find derating factors ...
Alessandro's user avatar
1 vote
1 answer
57 views

What must be considered when selecting a VFD-controlled PMSM that will be freewheeling beyond its nominal speed?

With a given two-pole motor, with all else being equal, if the pole count is increased to 6, the nominal speed will be reduced to 1/3. Can it be freewheeled to the same speed as the original 2-pole ...
K0ICHI's user avatar
  • 429
1 vote
0 answers
54 views

Is V/F maintained constant even in field oriented control or vector control drive of PMSM motors?

I understand that in scalar control V/F is maintained constant below rated speed, as Vector control drive is also a variable frequency drive, I would like to know whether V/F is maintained constant ...
nikhil valiveti's user avatar
1 vote
1 answer
546 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 ...
user232993's user avatar
0 votes
1 answer
26 views

230V 3-Phase Power Supply for VFD and PSU Repair

I am repairing CNC electronics and need some lab equipment. I need a 3-phase, 230 V input for the power supply and VFD to debug them. Where should I look to get a supply for this? Is there something I ...
Ishmael's user avatar
0 votes
0 answers
30 views

DC braking on induction motor (as done by VFD)

I know the principle of DC braking on an induction motor; a fixed magnetic field is induced in the stator and it makes the field in the rotor align to it. However due to the working of the induction ...
Lorenzo Marcantonio's user avatar
0 votes
0 answers
16 views

Wiring a 3ph motor with a VFD, motor has thermostat wires (overheat protection), where should these go in the VFD wiring scheme?

Motor is 1hp, 3ph, doerr LR22132 style with thermostat protection. VFD will be single phase 120v input, 3ph 240v output.
Richard Hedin's user avatar
0 votes
0 answers
44 views

Sizing capacity of a 1-phase breaker to feed a VFD and a 3-phase motor

I have a 3 phase 2HP motor that draws 5.8Amps at 240v I want to feed it with a VFD with the following specs: VFD rated power: 4kW 1-phase input: 36 Amps 3-phase output: 18.5 Amps The VFD is of ...
Max L.'s user avatar
  • 109
0 votes
0 answers
35 views

Driving multiple VFD controllers using collected data

I have a LoRaWAN sensor network that I setup which collects temperature data from multiple compost stacks and stores it in a database on the local network. I need to convert that data into an output ...
pheeper's user avatar
  • 101
0 votes
0 answers
70 views

DC motor set to 0.25 RPM pulling -5 Amps at nearly 20% torque - Why the heck is it doing this?

Drive controlling the motor: PowerFlex DC Drive, 460 VAC, 3 PH, 27 Amps, 15 HP/11 kW, Regen, IP20, NEMA/UL Type Open, No HIM (Blank Plate), User Manual, No Communication Module, A Frame Motor in ...
Cyange's user avatar
  • 1
0 votes
0 answers
63 views

VFD runs has backup generator, breaks down twice

I am Electroman, but very ignorant in electrical knowledge. I have a problem. We have an irrigation pump connected to a VFD that runs on the electrical grid but is connected to an emergency backup ...
electronman's user avatar
0 votes
0 answers
31 views

Could a varying voltage (0 - 600V DC) at varying frequency and current be input to a VFD to obtain a fixed voltage of 220 V 50 Hz and varying current?

A wind turbine generator produces a single phase varying voltage (0-600 V DC) at varying frequency and current. Could the generator output be fed to a VFD to obtain a fixed voltage of 220 V 50 Hz and ...
shah's user avatar
  • 1
0 votes
1 answer
40 views

Different load on series connected solar panels

I have a setup consisting of three solar panels connected in series, which supply power to a variable frequency drive (VFD) that runs a three-phase motor. I am planning to incorporate an MPPT (Maximum ...
Bilal Khan's user avatar
0 votes
0 answers
137 views

240 V three phase motor with VFD maxes out at 10 Hz

I have a Precious Plastic-style plastic extruder that I built. It's a big motor hooked up to a worm gear drive thing, that turns a big corkscrew inside of a hot pipe. All the parts seem to be working ...
blorgggg's user avatar
  • 101
0 votes
0 answers
40 views

VFD Driving a 40HP Inverter Rated Motor showing high Torque, Output Current at Low Speed

I am having some difficulty troubleshooting a Toshiba VFAS3-4300PC. I am using it to run a 40HP inverter rated motor that is driving a VRU Screw Compressor. I have the frequency range set for 12-60Hz. ...
Colin Fuller's user avatar
0 votes
0 answers
53 views

VFD - V/F control

I am new to VFD. I came across a code where even in simple V/F control for IM, the algorithm uses Phiboost and calculates Vd and Vq. What is the significance of Vd and Vq in simple V/F control ? Then ...
Chaithra's user avatar
  • 101
0 votes
0 answers
336 views

Modbus RTU on ESP8266 to control VFD

Hoping to get some help on setting up a NodeMCU (esp8266) with this 1 arduino library to control a Variable Frequency Drive (VFD). I'm afraid to say that I almost need help from square one, as I'm ...
Christian Carlsson's user avatar
0 votes
0 answers
32 views

How much lower than the ideal torqe curve is the actual torque of a PMSM running at overspeed?

VFD-controlled PMSM's are said to produce constant maximum torque up to the rated speed. Above the rated speed the VFD performs defluxing and produces constant power. This should then mean that at 200%...
K0ICHI's user avatar
  • 429
0 votes
1 answer
94 views

12 VDC to 380 VAC for 1 kW, 3-phase motor

What is the cheapest way to run a 1 kW, 3-phase motor for about 20 minutes on a 12 VDC battery? Will it be a 2 kW inverter to power a VFD or is there something else? And will a 100 Ah battery do, and ...
Kobus Pretorius's user avatar
0 votes
1 answer
30 views

vfd 3 or 1 phase input how is voltage adjusted

I bought a cheap VFD (variable frequency drive), it takes 3 phase input, but allows too for 1 phase input connecting the neutral and phase on the the first and third phase input. The vfd to my ...
George Kourtis's user avatar
0 votes
0 answers
49 views

Filter selection for a VFD output to minimize reflection that could damage the motor

Im installing a vfd for a submersible pump, i have read long cables causes problem for both the VFD and motor as voltage reflections cause large voltage spikes upto 2x the operating voltage. My cable ...
DrakeJest's user avatar
  • 897
0 votes
1 answer
96 views

How to visually display 3 phase output

We have inherited a PCB and must redesign it. Unfortunately, only the PCB was provided, no schematics or documentation. I know the PCB controls a VFD (which we have been given) and whilst I know we ...
MRB's user avatar
  • 412
0 votes
0 answers
83 views

Choosing a motor

Long time listener, first time caller etc! Also, if you think this could be better answered somewhere else please let me know. I'm building a pottery wheel at the moment and I'm in a bit of a quandary ...
Andrew Butt's user avatar
0 votes
0 answers
415 views

VFD max current rating less than motor peak current - problem?

Whats the worst that could happen if using a QUALITY 8amp VFD - single phase input, 230v, vector controlled - on a industrial 3 phase motor with peak current rating of 50 amps. Do VFDs have the ...
Mamba76's user avatar
  • 13
0 votes
2 answers
1k views

Three-phase motor VFD frequency / current draw

I am planning to convert a 1920 Drummond B type lathe to a 3-phase motor / VFD combo and am trying to understand the math involved with VFDs, mainly relating to frequency and current draw. How do they ...
Mamba76's user avatar
  • 13
0 votes
0 answers
76 views

Use closed loop torque control based on motor position to simulate a dynamic load

The goal is to use servo + gearbox to simulate a screwing process millions of times. A screwing process is characterized by a low torque at first (the screw enters the material) and once the screw ...
Alex's user avatar
  • 11
0 votes
2 answers
77 views

Table jitter on 40 ft planer mill at certain low feedrates with new 40 hp 3-phase motor and 50 hp ABB drive

The display on the drive shows 26 amps with little variation at all speeds. At 176.14 RPM it shows -9.2% motor torque, 25.63 amps. At 977 RPM it shows 26.04 amps and 2.4% torque. The motor spec ...
Rich Laxton's user avatar
0 votes
0 answers
52 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 ...
the aviator's user avatar
0 votes
0 answers
121 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 ...
M lab's user avatar
  • 1,404
0 votes
0 answers
25 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 ...
user2934303's user avatar
0 votes
1 answer
110 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 ...
Topa's user avatar
  • 19
0 votes
2 answers
80 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 ...
Sourav Garnaik's user avatar
0 votes
1 answer
91 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?
MANAS JENA's user avatar
0 votes
0 answers
193 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 ...
James Hock's user avatar
0 votes
1 answer
148 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 ...
James Hock's user avatar
0 votes
0 answers
68 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 ...
GNZ's user avatar
  • 1,759
0 votes
0 answers
360 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 ...
GNZ's user avatar
  • 1,759
-1 votes
1 answer
726 views

VFD minimum speed (frequency) and speed reference signal mapping

I am new to VFD configuration. Suppose I am using VFD for a variable speed pump control. The VFD is programmed to have minimum frequency 30 Hz and maximum frequency 60 Hz. The VFD receives its speed ...
RXS's user avatar
  • 1
-1 votes
1 answer
56 views

Difference between voltage measuring from induction motor junction box and VFD output terminal

I want to measure stator voltage of VFD fed induction motor. It's common to measure from juction box, which should be the exact stator voltage of induction motor, but I wonder if it's possible to ...
user11004178's user avatar
-1 votes
1 answer
274 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 ...
user14903776's user avatar