Questions tagged [vfd]
Variable frequency drive, a three-phase AC output motor controller. Questions about vacuum fluorescent displays should not receive this tag.
183
questions
0
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1answer
79 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 ...
0
votes
1answer
71 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 ...
3
votes
3answers
146 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 ...
3
votes
1answer
144 views
Controlling the speed of a single phase 4-pole induction motor
I have a Crompton Greaves single phase induction motor that powers my drill press (image below). I believe it’s rated at 1/2HP. I wanted to control the speed of this motor so that I can use the drill ...
0
votes
3answers
398 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 ...
0
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3answers
32 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
1answer
49 views
What Happens if Uncharged VFD is Connected to Charged DC Bus
if the dc fuse of the uncharged drive is closed when the dc bus of other drives is charged , what happens ? Is there any risk of damaga capacitor ? As I know, capacitor can stand to very high currents ...
0
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2answers
93 views
Why it is required to fuse each inverter in common DC bus
I have four variable-frequency drives (VFDs) in total supplied from one largest VFD in system. The other three VFDs don't have connection to ac grid. These three VFDs are supplied from common DC bus.
...
0
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2answers
85 views
YL620 VFD terminal strip is small - wires are big. Connector options?
I'm attaching input power (240V single phase) and motor load (3-phase, variable frequency) wires to a terminal strip of a Variable Frequency Drive controller (YL-620).
The power rating for the device ...
0
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0answers
86 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 ...
0
votes
2answers
122 views
3 phase motor VFD frequency / current draw help needed?
I am planning to covert a 1920 Drummond B type lathe to 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 ...
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2answers
84 views
Help choosing 3 phase motor and VFD for mini lathe project
I bought a 101 year old mini-lathe (Drummond B type) and from what I've seen and read online it should be possibe to bring this lathe into the 21 century.
In my most extreme vision I would like to ...
0
votes
2answers
53 views
How can i choose the right VFD for an electric motor?
I have a 1.5kW three phase electric motor that is in a delta configuration. This motor has a motor voltage of 230/400V and a rated current of 5.9/3.4A. What sort of VFD should i be looking for that ...
0
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0answers
37 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 ...
0
votes
2answers
64 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 ...
1
vote
1answer
68 views
Induction motor 'droop control' on multi-motor coupled loads
When using droop control to balance the torque across multiple motors driving a coupled mechanical load such as a chain conveyor, what is the actual variable that is being altered by each drive? From ...
8
votes
3answers
1k views
Why do variable frequency drives (VFDs) need so much information?
I'm an electricians apprentice at a mine. I understand the basic operation of variable frequency drives (VFDs), rectification, filtering, and pulse width modulation. But, at the heart, all they're ...
0
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0answers
46 views
Ramp up voltage on a small AC train motor
I am looking to start older electric trains that run off an AC transformer at a gradual ramp up of the voltage when coming out of a block signal area instead of starting at the last voltage set on the ...
0
votes
1answer
51 views
Pole counts for VFD driven induction motor
What is the significance of pole count of IM if it is driven by a VFD? If we are using the power supply frequency (50Hz or 60Hz), the pole counts matter in terms of torque and synchronous speed.
But ...
0
votes
1answer
64 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, ...
8
votes
4answers
2k 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 ...
1
vote
0answers
56 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 ...
0
votes
1answer
116 views
Building a VFD for a split phase (capacitor run) motor?
I'd like to get variable speed on a very tiny lathe (Taig, 4" swing). I've got a dishwasher motor I'm planning on using for it, which is rated for 3600rpm at 60Hz (it's about 1/5HP). But it's a ...
0
votes
3answers
144 views
EMC Cable shield used as PE wire, great idea or not?
In order to save on cabling, our company uses 3 wire EMC cables to connect electric machines to their VFD's. Some folks in our company think we should really use a dedicated ground wire, many are of ...
0
votes
1answer
54 views
How do VFDs limit the starting current of the motor?
I have a 5 HP three phase motor.
I am going to install a variable frequency drive (VFD) for speed control.
I know that VFDs are used to soft start motors.
How do VFDs limit the starting current of the ...
1
vote
0answers
37 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 ...
0
votes
1answer
64 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
2answers
88 views
380V Wye on motor nameplace,VFD manual requires 220V delta. Will it work?
I removed a motor (nameplate attached) from an eddy current drive. My intention was to replace the controller with a VFD and remove the clutch assembly. The motor obviously ran at full speed with each ...
1
vote
1answer
94 views
Maximum Voltage That Can be Applied to a Motor
I was reading about 87Hz technique. I saw we can configure the drive for a motor 400Y/230D as 400V /87hz. I know v/hz ratio should be kept constant and when we configure drive as 400V and 87 Hz and ...
0
votes
0answers
29 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 ...
0
votes
0answers
43 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 ...
3
votes
2answers
264 views
How to choose and wire a Variable Frequency Drive [closed]
I have a 1.5 HP 3PH 240V Leeson motor that I want to drive my lathe, but I want to vary the speed. I asked a question on this site about a month ago about how to do that and the recommendation was a ...
0
votes
0answers
20 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 ...
0
votes
1answer
1k 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 ...
0
votes
1answer
93 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 ...
0
votes
1answer
371 views
VFD for a 3-phase delta-connected 415V~ motor
When a motor starter is to be replaced by a 3-phase 415V~ VFD, can the existing motor be used without changing its winding configuration (star/delta)?
The motors are from different manufacturer
...
1
vote
2answers
47 views
What exactly is 1.x and 2.0 power scalar V/f control in VFDs?
These are terms that I have come across in multiple operating manuals for VFDs and usually, they just mention that it's used for variable torque applications. My doubt is "what exactly is it?&...
1
vote
2answers
77 views
Is upsized reactor allowed for the comparitively less motor HP?
We have a LV-MCC in our commercial outlet having a 480 VAC, 15 HP VFD with line and load reactors in series with it. The VFD is sized for 22.0 A (normal duty), the motor has a horsepower rating of 10 ...
1
vote
2answers
410 views
Tesla Model S inverter DC bus voltage
I was recently researching about this Telsa electric car inverters where i found one intresting thing.
Usually in the voltage source inverter the DC bus voltage will be around 600 to 650 V considering ...
1
vote
1answer
25 views
Delta Servo Drive 220V/400V Series
ASDA-A2 Delta Servo Drives including two types: 220V and 400V series that it seems the difference is input voltage of the Servo Derive. but i doubt 220VAC or 400VAC is line to line voltage or line to ...
1
vote
2answers
794 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
1answer
71 views
AC Induction Motor Slip and Torque control Vs V/f control
I am trying to understand this github code for speed control of AC Induction Motor. It calculates slip value to adjust the speed of motor. I wonder if its the same thing that is called constant V/f ...
1
vote
1answer
403 views
4-20 mA output from Arduino for VFD
I'm a beginner with electronics, so everything has to be explained in simple terms to me.
I have an Arduino with a program which provides a value via the Analog output, so that is anything from 0-5 V....
1
vote
1answer
70 views
Why are inverter modules extremely oversized in VFDs?
I was checking a faulty Schneider VFD (ATV312H037N4) which is rated for a nominal output current of 1.5 A. Turns out the rectifier bridge of the inverter module (FP10R12YT3) blew up and after reading ...
0
votes
1answer
41 views
Explanation request of a paragraph in a VFD manual about a diode, should I add it or not?
I didn't fully understand this paragraph in a VFD manual:
My question is: is the free-weeling diode exist inside the drive, or should I put an external one?
3
votes
3answers
122 views
Which frequency is the best for a 3-speed Motor?
Sorry I dont know the appropriate terms that should be used in this subject!
I have an inductive motor, it has 3 different speeds (or windings) at 50 Hz:
350 rpm / 700 rpm / 970 rpm
I want to ...
0
votes
2answers
572 views
Converting single-phase 120 V or 240 V into three-phase 4-wire 120/208 V
I am needing to convert either 240 V or 120 V single-phase into 120/208 V three-phase 4-wire. The load needed is 30 A. My panel can supply up to 100 amps, so the amperage isn't an issue.
I've looked ...
1
vote
1answer
51 views
suggestions for how to implement a weird VFD jog mode?
I'm a total noob at electronics, but my employer has asked me to try to program a replacement VFD on our industrial stone-cutting saw. Everything works on it now, but I need to figure out how to ...
2
votes
5answers
309 views
What happens to a high power inductive motor if you decrease the RPM to half the rated in terms of current, torque and heating?
and what is minimum possible RPM ratio for a high power motor
3
votes
3answers
1k views
How many times of a frequency of a PWM can properly generate a sine wave to drive a motor?
I know PWM with dense and loose duty cycle is used to generate sine wave for applications such as 3-phase motor driving. But, How fast does it require to properly generate a sine wave to drive a motor?...
