Questions tagged [vfd]
Variable frequency drive, a three-phase AC output motor controller. Questions about vacuum fluorescent displays should not receive this tag.
0
votes
1answer
67 views
What actually kicks in a VFD?
I am just getting into the plant environment and the first thing I noticed is that virtually all the motors are controlled by VFDs.
I understand that your supply goes into your RST terminals and the ...
0
votes
1answer
45 views
Output voltage of 3-phase in / 3-phase out inverter
I am using UK mains (230 V phase, 400 V line) to drive a Japanese motor expecting 115 V phase, 200 V line), presently using 2:1 transformers. I would like to control speed between 30 and 70 Hz, ie +/- ...
1
vote
2answers
47 views
How much is the permeability of this attached inductor core?
I want to use this inductor for AC line filter as line reactor. Its inductance value is 6 mH but I don't know the exact value of permeability of the material. It will be used with VFD at the input to ...
0
votes
1answer
45 views
how to design AC line filter for VFD?
I am working on VFD for single phase induction motor. I am rectifying AC 220V directly to DC link capacitor. There is no LC filter from AC mains. There are harmonics in the AC mains. Can you suggest ...
0
votes
1answer
15 views
Polyphase motor with VFD
I purchased a dayton 1/3 hp 1725rpm and am wondering how to use it with a VFD. It says continuious as duty. I only have 220 at my house so I am wondering if i can set it up with a VFD and use it to ...
0
votes
1answer
35 views
Can VFD be used with induction motor for regeneration?
I want to use VFD with induction motor to run it as induction generator (driven by external prime mover). Does VFD circuit allow reverse flow of electrical power?
Thanks
0
votes
1answer
70 views
Why even when we increase the synchronous speed, the slip still remains it's value? [closed]
This is an induction motor question: why even when we increase the synchronous speed, the slip still remains it's value?
1
vote
3answers
69 views
Using PWM instead of real DC for VFD's 0-10V control input
There is a VFD which controls an AC motor through a 0-10V control. I know that this control voltage is DC voltage.
I'm wondering would a PWM work for this application? I mean instead of 2VDC, what ...
-2
votes
1answer
39 views
Programming LS-iG5A
I have got this LS iG5A VFD to control speed of my
rotary cutter machine. I have attached a momentary
On/Off switch to start stop the motor and also
connected a 10k POT to control its speed
My ...
0
votes
1answer
318 views
How does carrier frequency and pulse width modulation in a VFD work together to control AC motor speed?
There is a lot of online information about this but there is also a lot of contradictory information. What is carrier frequency exactly and does it stay the same or does it vary? I understand the ...
0
votes
1answer
44 views
Mega2560 master on RS485 bus stops communicating with VFD when I add another RS485 module
I’m doing a project where I’m building a control panel for a VFD (inverter/variable frequency drive). I’m connecting the two over half duplex RS485 and use Modbus RTU. As a master I use a Arduino Mega ...
0
votes
2answers
163 views
What is the recommended way for starting an ac induction motor with a VFD?
I am designing a control strategy for an AC(induction) 3-phase motor fan in an HVAC air handling unit for pressure control inside the ductwork.
The plan is to use a PID algorithm for the pressure ...
0
votes
1answer
257 views
Earth leakage tripping with 3 phase motor [closed]
I'm working in elevator world, i'm now in a strange situation.
The 3 Phase synchronous motor is connected by drive then main controller and a distribution board.
The faulty earth leakage circuit ...
0
votes
2answers
591 views
How to measure output voltage and current of a VFD?
Is it possible to measure the output of a Variable Frequency Drive without relying on it's display data? I tried to measure the line voltage with a DMM and current with a clamp meter but it shows ...
0
votes
2answers
73 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
1answer
103 views
EMI shielding for VFD and DC PSU's for CNC controller
The plan was to mount a VFD (Spindle) and (x3) 48V Power supplies on MDF and near it I want to mount 4 TB6600's for motion controlling a CNC machine. I would like to make it enclosed with some small ...
2
votes
1answer
339 views
Running a 3ph motor rated for 380v star on 220v delta
I've got an old Soviet 4kW motor, made in 1983. The dilemma is that the nameplate info states a Y-connection/380v/8.7amps and I want to run it on delta using my VFD which produces 3ph 220v. All my ...
0
votes
2answers
241 views
How to modify winding of 3 kW 4 pole motor to run at 200 hz
Please guide me how a 3 kW 4 pole induction motor can be modified to run at higher frequency in the range of 0 to 200 hz.
If the rotor motor is die cast copper. What should be done with present ...
3
votes
4answers
700 views
what are the implications of using a 45kW ACS580 ABB VSD on a 22kw induction motor?
What are the implications of using a 45kW ACS580 ABB VSD on a 22kW induction motor?
0
votes
1answer
80 views
Is there a way to overdrive a single phase, capacitor start, AC motor?
I have an AC system that runs on single phase 120v AC. The "motor" is a hermetically sealed compressor, fractional horsepower. It has a single capacitor about the size of pill bottle. Based on that, I ...
0
votes
1answer
89 views
Are there safe ways to run an induction motor rated for 50/60 Hz at a lower frequency?
I have an induction motor that is rated for 50/60 Hz, with full-load amperages of 1.85A / 2A respectively.
It is not rated for any other operating frequency.
If I connect it to a VFD, will it be safe ...
0
votes
2answers
100 views
VFD? to power aircraft non-motor/inductive load OR power conversion [closed]
QUESTION: Is it plausible to test power, out of aircraft, a mostly solid state device ie Microwave Oven? Can a VFD be programmed to run with inverter circuits. If so, 3 phase + ground output of VFD is ...
0
votes
0answers
51 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 ...
0
votes
3answers
174 views
power to a 230v three phase motor
a. Is it possible to run a 230v three phase motor with a 115v input VFD? Where does the other 115 volts come from in this case?
b. How would I size the VDF for this case. I know my VFD will need to ...
0
votes
2answers
161 views
Slip ring (wound rotor) 3 phase motor, what VFD should I use? [closed]
I'm trying to solve some puzzles around the electronics of an amusement ride. It's basicly an old carousel with a wave-like pattern (3 tops/downs along the circle) that i'm restoring. (So that you ...
0
votes
3answers
82 views
Does this type of Dual Voltage AC Drive exist?
The goal is to run a 3ph AC motor with either high or low voltage inputs. The motor would be wired for a specified voltage and the controller drives a single output regardless of the line voltage. I ...
0
votes
1answer
68 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 ...
0
votes
2answers
834 views
Condition for max torque
My questions are these:
If say a 3ph motor connected to a mains supply is rated at 1400 rpm with no load at what rpm approximately does it produce its max torque?
If the same motor is run with a VFD ...
0
votes
2answers
50 views
Powering three separate shaded pole axial fan motors with one 3-phase VFD
I want to power and control the RPM of three 115v .47amp shaded pole axial fans each powered by a separate leg of the 3-phase coming from a VFD. Can it be done? I'd like them to run at full speed (...
1
vote
2answers
112 views
Should a frequency-controlled motor use a circuit breaker with a B or C trip characteristic?
In our company, a discussion is raging on whether a motor with a frequency controller should be protected with an automatic circuit breaker with B or C characteristic.
The B-camp's argument is that, ...
1
vote
2answers
2k views
How to calculate RPM using frequency
I am working with VFD (CT-2002ES-A75). It shows output frequancy on it's seven segment display. However It has a parameter(Cd46 on page 27 in the manual) for display the current RPM of the motor.
For ...
0
votes
0answers
43 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 ...
0
votes
0answers
56 views
A question about VFD earth ground
As part of my investigation on noise issue from this VFD drive, I was trying to understand how the earth connections made. The following figure is from page 25:
Im trying to check whether the drive ...
0
votes
4answers
178 views
VFD IGBT blew up and I can't find a replacement part
So here’s my situation, a few weeks ago I received a 2.2kW variable frequency drive from a chinese seller and it worked perfectly. I then watched a video on youtube by AvE where he takes one apart (...
-3
votes
1answer
86 views
How to connect to the inverter with motor [closed]
I have a motor and a inverter (CT-2002ES-A75).
Motor nameplate is:
How should I connect the motor to inverter?
What are the special parameter in the inverter that should I change according to the ...
0
votes
3answers
455 views
why three phase induction motor draws current with spike at low frequency by using VFD?
I have built Variable frequency drive (VFD) for a three-phase induction motor using V/F constant control. while I was testing 15HP three-phase induction motor without load with my VFD, the motor draws ...
0
votes
0answers
113 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 ...
2
votes
1answer
153 views
Is it possible to connect a phase control relay to an inverter (VFD)?
Is it possible to check a motor ON/OFF state by connecting a phase control relay to the inverter and the motor 3 phase terminals?
I have tested a phase monitoring relay to a main 3 phase supply from ...
0
votes
3answers
396 views
A simple way to detect an AC 3 phase induction motor ON/OFF state
Background:
There is a 3 phase motor running by an inverter. motor specification is about 1.8KW power and 230/400V and 1.13A. I want to drive another DC motor synchronized with that AC motor so the ...
1
vote
1answer
98 views
Induction motor scalar control
I have been developing a software for scalar control of three phase induction motor with squirrel cage rotor. This control method is based on voltage-frequency characteristics of the motor. The used ...
0
votes
1answer
48 views
When supply fan VFD starts up it causes communication problems for my energy management controller
We have an energy management system that controls the air handlers for a building. I have one unit that when the supply fan VFD starts up it cause the unit controller to start having communication ...
0
votes
4answers
242 views
Running a 15HP Motor with a 30 kW VFD
We are going be buying a 15 HP motor, and using a VFD we have, currently not doing anything. While I'm told that typically, you buy a VFD for the Motor (i.e. 15 HP Motor + 15 HP VFD), we couldn't let ...
1
vote
3answers
1k views
How to determine full-load RPM of an induction motor at any arbitrary frequency?
Lets say an induction motor's spec sheet states the following:
1/ 50 Hz, 2-pole, full-load rotations-per-minute (RPM) = 2850.
2/ 60 Hz, 2-pole, full-load RPM = 3450.
Can we extrapolate this ...
0
votes
1answer
96 views
What is the best and cheapest load to test a variable frequency drive at full load?
what is the best and cheapest load to test a variable frequency drive (1 HP VFD) at full load?
Maybe a centrifugal pump ?
Thanks in advance
3
votes
4answers
97 views
Can I use a VFD to send power of a specific frequency to a frequency meter?
I have a beautiful old frequency meter from a power station, a "System Frahm" type panel based on vibrating reeds. It has two rows with 21 reeds in each, each going from appx. 45 Hz to 55 Hz. It says ...
1
vote
2answers
410 views
VFD: Regenerative overvoltage trip during deceleration or stop
I have a Mitsubishi VFD Model: FR-F720.
It shows the error E0u3, which means according to the manual: "If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed ...
0
votes
1answer
83 views
At which set point (frequency) will a VFD dissipate the most heat? [closed]
On a typical application for a variable speed centrifugal pump, at which percentage speed setting will the VFD dissipate the most heat, in other words have the highest losses?
-1
votes
1answer
100 views
Converting Single Phase Mains into 3 Phases (No VFD) [closed]
I have a goal to build a circuit from scratch to simulate a 3 phase motor. I do not have any specific requirements, rather, I want to make sure that I understand what is wrong with my approach and ...
2
votes
2answers
72 views
How can I tell if a cable is rated for use as motor leads with a variable frequency drive?
I understand that the switching edges generated by a VFD can cause corona breakdown of the insulation on the motor leads. Due to this, it is recommended that some cables be used for VFD motor leads, ...
0
votes
2answers
3k views
How to calculate the DC rail voltage for Variable frequency drive (VFD) for single phase induction motor?
I am working on VDF for Sigle phase induction motor. I just want to compute the total voltage of single-phase induction motor that will need to create from DC link. I am not sure about the calculation....
