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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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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 ...
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 ...
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, ...
2 votes
2 answers
3k views

Motors Delta/Star connections to VFD

I've selected 230/400V motors (delta/star) and corresponding 400V VFDs for pump motors. Now I've been asked why I haven't selected 400/690V motors (delta/star), that are the standard and usually ...
0 votes
2 answers
1k 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 ...
0 votes
3 answers
4k views

Benefits of using a sine wave filter with variable frequency drive

Sometimes sine wave filters are installed on the output side of a variable frequency drive (VFD.) My understanding is that these filters are advised in situations where there may be capacitance among ...
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 ...
0 votes
3 answers
50 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 ...
0 votes
1 answer
44 views

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 ...
0 votes
1 answer
98 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....
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 ...
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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 ...
1 vote
2 answers
102 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 ...
0 votes
2 answers
5k views

Understanding VFD speed control input using a potentiometer

I am working on hooking up a potentionmeter as a speed control input to a variable frequency drive. Here is are the diagrams from the VFD manual: (Its a Lenze AC Tech SMVector ESV112N01SXB; full ...
-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 ...
0 votes
0 answers
25 views

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 ...
0 votes
1 answer
229 views

VFD Motor Bidirectional Control

So I have a control panel which controls the speed and direction of a motor in a sliding mechanism. the direction can be inverted using a tri-state selector on the panel. the selector input is a ...
3 votes
1 answer
615 views

Testing an induction motor with a VFD, difference in voltage and mechanical power vs electric power

I have question about a electro motor powered by a frequency regulator. It is the first time I did some test on a frequency regulator on school. This are the parameters of the motor The motor is ...
2 votes
1 answer
245 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 ...
0 votes
1 answer
364 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?
1 vote
4 answers
7k 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 frequency.) Normally, without a VFD the nominal ...
0 votes
0 answers
22 views

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 ...
1 vote
4 answers
542 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 ...
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.
0 votes
1 answer
92 views

Can I operate a 500kW/1500rpms motor at 35Hz with 400kW inverter?

In stock we have a 3 phase induction motor with a rated power 500kW and 1490rpms. What is the smallest frequency inverter which we can use to operate this motor in a machine with a maximum power/...
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 ...
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 ...
2 votes
0 answers
140 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 ...
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 ...
0 votes
1 answer
105 views

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 ...
0 votes
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 ...
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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 ...
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 ...
1 vote
2 answers
623 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. ...
0 votes
3 answers
891 views

V/f Constant control for single phase induction motor?

I am implementing a Variable frequency Drive control of single phase induction motor. I am little bit confused about the V/f ratio and voltage level. i boosted voltage upto 380V for Inverter . if i ...
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 ...
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 ...
3 votes
3 answers
648 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 ...
2 votes
1 answer
159 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 ...
0 votes
1 answer
391 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 ...
0 votes
3 answers
575 views

Motor voltage and VFDs

Is it possible to use a motor with a lower voltage rating than the line input to the VFD that it's running on? Most VFDs have a parameter to set the maximum motor voltage, what effect does this have?
0 votes
1 answer
556 views

What would cause DC bus voltage on my VFD when the disconnect is off

125 hp 480 vac HMax VFD. Controlling a pump motor. Motor is not spinning and line to the VFD is disconnected. I was putting the output wires back on the VFD, when moving the second one into place, ...
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. ...
0 votes
2 answers
278 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?
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 ...
3 votes
4 answers
1k views

How to control a blower using the analog output from a PID controller?

I built a biomass burner which is powered by a blower. For precise control of temperature I am using a PID controller PID500 from a company called selec . I passed the PID analog outuput to a VFD ...
0 votes
1 answer
58 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 ...
8 votes
4 answers
4k views

Can I run a VFD off a generator?

I want to power a three-phase 5hp well pump with a VFD. I want the VFD both to serve as a soft start, and to allow variable speed operation of the motor. Two different pump salesmen have told me that ...
5 votes
2 answers
12k views

Can you use a vfd to run a capacitor start motor?

I've read on many forums, publications and specification sheets that it's not possible to run a capacitor start motor using a VFD. The start winding of such a motor is momentarily powered until the ...
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 ...

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