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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Make a 0.5 HP, 3-phase motor work with single phase voltage with capacitor [duplicate]

I have a MGM Varvel's SM71B4 AC motor which runs on 3-phase that comes out of a Schneider Electric's VFD called Altivar ATV12H037M2. The VFD has failed and doesn't show the input voltage, so I decided ...
Akash Patil's user avatar
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Long distance cable to monoblock centrifugal pump from PV VFD [duplicate]

I want to install a three phase 10 HP monoblock centrifugal pump that is around 200 meters away from the PV solar Vfd. The solar system is installed with 16 solar panels of jinko 555 p type. I would ...
Mir Ali's user avatar
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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
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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
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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
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2 votes
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How to release "idle" brake of a three-phase motor? [closed]

I am using a three-phase motor (Segmotor SS Serie) with a VFD (Delta VFD-EL-W). When not under tension, the motor's shaft is blocked by a brake. How can I bypass this brake? (either directly on the ...
Jo Kolski's user avatar
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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
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1 answer
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VFD interference with microcontroller

I’m doing a project that requires the control of a VFD (variable frequency drive) that powers a motor by using a microcontroller to send the signals. When the VFD is powering the motor, there is a lot ...
francesco guerrini's user avatar
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1 answer
63 views

CLOSED: Naive Question - VFD powered receptacle to power European 3-phase 2.2 kW 50 Hz powered equipment

I've updated the title as "CLOSED" because the thoughtful responses have answered my naive question. I did quite a bit of research yesterday and this research, combined with the forum ...
AlphaBob's user avatar
1 vote
4 answers
396 views

Maximum output voltage of a basic variable frequency drive circuit

When looking up the basic schematic of a variable frequency drive (VFD), the result is something like the following image: I am aware that this is a great simplification, but in order to improve my ...
sasodoma's user avatar
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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
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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
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1 answer
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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
2 votes
1 answer
102 views

Unknown motor with continuity across all windings. Help identify star vs. delta

I'm converting an old milling machine (Optimum F40E) machine to be driven with a VFD, and I have it working. The head is a geared head, and with correct settings (torque compensation) in the VFD I can ...
Lee Hambley's user avatar
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1 answer
238 views

VFD parameter calculation for 3 phase motor

I have a small (¼ hp) motor that am going to hook up to a VFD. The VFD is programmable, and I'm planning to run the motor at 16-65 Hz with ∆ configuration. The question is: what is a good ball park ...
KristoferA's user avatar
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1 answer
256 views

Motor frequency increase using a VFD

If I increase motor supply frequency to 70 Hz or more using a VFD, while maintaining the voltage at its rated value, will the current drawn by the motor increase?
Priyesh n's user avatar
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124 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
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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
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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
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Do modern variable frequency drives perform power factor correction?

Do modern variable frequency drives (VFDs) perform power factor correction? I can't find info to see whether VFDs do power factor correction. If they do, how good are they?
PigSpdr's user avatar
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Interference from compressor pressure switch

In my CNC machine, I have a small air compressor and a spindle motor VFD connected in same 240 VAC outlet. Whenever the compressor switches on or off, the VFD reports "OC-o" error. According ...
jpa's user avatar
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290 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
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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
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1 vote
2 answers
113 views

Can you run two motors of different hp off the same VFD independently?

Can you use the same VFD to run two motors of different hp (20 hp and 10 hp) if all other parameters are the same? The motors will never run at the same time, it will be one or the other, and the ...
voltron's user avatar
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1 vote
1 answer
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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
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4 votes
2 answers
283 views

Help to diagnose 3-phase induction motor stuttering

I’m working on a project where I want to run a 3-phase induction motor (see picture for specifics) using a VFD (Variable Frequency Drive). The VFD I have is a cheap Chinese one (the “T13-750w-12-H”), ...
Christian Carlsson's user avatar
0 votes
1 answer
104 views

Magic smoke from "AC 50-500V LED Digital Voltmeter Ammeter" when connected line-to-line on output of VFD

I wired 3 "AC 50-500V 0-100A Persegi LED Digital Voltmeter Ammeter 110V 220V Tegangan Saat Ini Meter Voltammeter Mobil Volt Amp Tester Detektor" like this (but I paid a lot more for them...)...
SV Savannah's user avatar
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231 views

Using one variable frequency drive for 2 motors (one at a time)

Is there any issue using one VFD, to run 2 motors— one at a time using a selector switch? So 3 phase in the the VDF— the frequency is modified and comes out the VDF— into a switch intended to switch ...
SV Savannah's user avatar
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1 answer
75 views

Will a 3-phase variable frequency drive have any effect on voltage differences between phases?

The national power provider here is not great. There is often a 10 - 30 V difference between phases. Will the voltage exiting a 3-phase variable frequency drive be the same as the input voltage, or ...
SV Savannah's user avatar
0 votes
1 answer
81 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
2 votes
4 answers
1k views

Variable Frequency Drives for slowing down a motor

I am changing my water pump over form a diesel engine to electric motor. Problem is the motor i have is too fast, and it will be complicated to replace it. The pump requires more power the faster it ...
SV Savannah's user avatar
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1 answer
29 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
-1 votes
2 answers
270 views

If a VFD-driven induction motor can be operated as a generator, what will be the voltage and frequency of the generated voltage?

It is known that when an induction generator is connected to the grid, the frequency and voltage of the electricity generated will be that of the grid but when the VFD is connected inbetween grid and ...
user133896's user avatar
2 votes
1 answer
56 views

Can I use a 3-phase driver like FNB41560 on 1- and 2-phase motors too?

I want to reduce complexity on buying many different parts and design different circuits. So I'm thinking if I can buy just FNB41560s that are well priced and simple and are capable of driving 3-phase ...
bigubr's user avatar
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3 votes
2 answers
2k views

Can the output voltage of this variable frequency drive (VFD) be varied?

I am looking to buy a Cutler-Hammer "Adjustable Frequency Drive" AF91AGO BF25D. I’m a bit confused even after going through its datasheet. Can the output voltage of this VFD be varied from 0-...
The_Vintage_Collector's user avatar
0 votes
1 answer
858 views

400 V, 3-phase electrical motor on 230 V, 3-phase supply WITHOUT rewiring?

I have a what I assume is a very unusual question, and an unusual situation. I do appologize if it has been explored before, but I could not find anything about it when searching. I also appologize ...
Viktor's user avatar
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2 answers
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VFD speed reference command: Will MODBUS/TCP have better resolution than 4.0 ~ 20.0 mA

I need help to understand the difference between tranditional 4.0~20.0 mA and digital communication (for example MODBUS/TCP) Assume: a PLC communicates with a VFD to control a variable speed pump from ...
RXS's user avatar
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-1 votes
1 answer
590 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
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0 votes
0 answers
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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
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1 answer
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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
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0 answers
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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
-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 vote
3 answers
505 views

How can the energy produced by a generator be fed back to the motor that rotates the generator?

The drawing below shows an induction motor (IM), powered from the grid through a variable frequency drive (VFD). This IM, through a gearbox, rotates a permanent magnet synchronous machine (PMSM) ...
Robert Werner's user avatar
13 votes
4 answers
8k views

Why does the current carrying capability of a cable increase with temperature

I'm specifying cable for a VFD application and came across this table regarding NEC ampacities and corresponding cable size. What I found interesting is that the ampacity increased with temperature ...
SRR's user avatar
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0 votes
2 answers
460 views

How is power consumed by an induction motor calculated based on speed (from a VFD) and torque induced by the rotor shaft?

I've been tasked with carrying out some design improvements on my company's production floor. There is a flat belt conveyor assembly line, whose movement forward movement is controlled by a single ...
kvj's user avatar
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0 votes
1 answer
286 views

Is a change-over-switch with a VFD dangerous?

We are using a variable frequency drive (VFD) with a compressor. We added a rotary cam changeover switch (600 V/50 Hz, picture is attached) in between the compressor and the motor. The purpose of ...
Fame313's user avatar
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2 votes
2 answers
211 views

Regenerative Drive VFD when drive is a major % of network load?

I'm in the process of designing a new facility with about 50-60 VFDs in the 5-10 HP range, another 5 VFDs in the 100-225 HP range, and then one burly beast at 1000 HP. I've been looking into various ...
user avatar
0 votes
1 answer
202 views

Generator to run a compact industrial VFD (Sinamics V20)

I have a Siemens Sinamics V20 (0.5HP) industrial VFD (as picture), powering a 3-phase 0.25 HP electric motor. I work in the field and generator is the only way to have electric power. I am looking for ...
JoaoN's user avatar
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0 votes
1 answer
80 views

Why AC motor driver shorts out?

I have been working in a VFD using an AC motor driver FSBB30CH60DF and making control of it using a dspic30f4011. As you can see in the attached circuit schematic, the mains supply is a single phase ...
Renzo Tapia's user avatar
3 votes
3 answers
589 views

Replacing a 3-phase speed-varying drum switch with a VFD?

I am working on a stock feeder / power feeder (used with woodworking equipment). It has an 8-position drum switch to control both fwd/reverse direction as well as vary the speed. The ON positions of ...
StayOnTarget's user avatar
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