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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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Can I run a one-phase AC capacitor motor from a three-phase VFD?

I'm building an art installation and found a cheap but strong AC Motor with capacitor. So by my understanding it is a one-phase capacitor run motor. The shield with the specs is very old and hardly ...
RSS's user avatar
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1 answer
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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
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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
59 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
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3 answers
55 views

Need to make 380V and 415V 3-phase motors work with 480V 3-phase power supply. Will a 480V->400V autotransformer cut it?

I will have multiple 415V and 380V motors to power with a 480V/3-phase supply due to an international supply chain and tight budget. I would like to know if the solution to my issue is as simple as ...
Popeye's user avatar
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Is there a way to reduce harmonic current for a single phase VFD without using an active filter?

I have this smallish VFD, for a 2.2kW motor, single phase. So it's smallish as VFD but as a single phase load is quite big; this is Europe so it's 230/50Hz land. However, it need to pass EMC testing ...
Lorenzo Marcantonio's user avatar
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1 answer
100 views

Braking resistor getting hot due to constant DC voltage on terminals PBe and PB on ATV320 [closed]

The drive is used in hosting application and I set the hoisting per-configured macro at commissioning, But once I power on the drive and it is at RDY state the resistor gets very hot after few minutes....
RootOfMinusOne's user avatar
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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
1 vote
2 answers
103 views

Which part on the circuit board has the software or firmware? [closed]

I am having difficulty to locate which part holds the firmware or software to make the board function properly. The board is used as a control for a 375 kW drive. I replaced the board with a new one ...
عمر العفيف's user avatar
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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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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
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45 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
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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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144 views

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
561 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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64 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
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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
41 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
2 votes
1 answer
170 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
0 votes
1 answer
418 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
0 votes
1 answer
379 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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0 answers
138 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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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
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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
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2 answers
281 views

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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1 answer
59 views

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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0 answers
337 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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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
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1 vote
2 answers
141 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
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
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4 votes
2 answers
353 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
109 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
0 votes
1 answer
290 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
0 votes
1 answer
81 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
95 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
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
-1 votes
2 answers
297 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
59 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
1k 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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0 votes
2 answers
87 views

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
737 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
51 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
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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
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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

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