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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.

3
votes
1answer
5k 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
3answers
973 views

DC Bus Conditioners in VFD Drives

In VFD Drives, DC Bus conditoners are used to protect the DC link supply from transients. Can you please let me know the different scenarios DC Bus of a VF Drive gets these transients and their ...
0
votes
1answer
3k views

CAN protocol : How to start with CAN interface with Microcontroller [closed]

I want to communicate with VFD (variable frequency drive) via CAN open protocol. I have never used CAN before. So can anyone Guide me from where Should I start with ? Any link or Suggestions would ...
0
votes
1answer
81 views

Does the RoHS standard apply to variable frequency drives?

I'm having a bit of a disagreement with a customer about whether RoHS applies to variable frequency drives and comparable equipment. This is complicated by my understanding that RoHS is being rolled ...
0
votes
1answer
121 views

Starting the VFD from a specified frequency instead of 0 Hz [closed]

I have Hyundai N100 inverter. PLC is sending 0-10V analog signal to the inverter. It starts from 0 Hz and then reaches the maximum frequency of 50 Hz. Now i want it to start from 40 Hz instead of 0 Hz ...
0
votes
2answers
56 views

Why there is continuous variation in output frequency of a Hitachi Inverter (L100 Series)? [closed]

I am using a Hitachi L100 Series inverter and its frequency source is Keypad Potentiometer. During run it is continuously changing the output frequency which is displayed on the Operator Display ...
3
votes
3answers
342 views

Motor Induction motor design specifics

I wanted to know the difference between the motor(s) used in the Tesla Model-S and commercially available motors. a busy cat http://insideevs.com/wp-content/uploads/2014/12/Screen-Shot-2014-03-09-at-...
1
vote
1answer
436 views

variable frequency three phase AC

I want to generate 1-150Hz+ three phase AC. Output voltage at maximum frequency would be around 240VAC and current around 40A. I have a few 60Hz three phase induction motors, drive shaft coupler, and ...
1
vote
3answers
4k views

The leads of my 3-phase motor are incorrectly labeled. How do I determine the correct labels?

I connected my new-in-box 3-phase motor to my new-in-box VFD, following the instructions in both manuals and the wiring diagram on the name plate (low voltage configuration). With the power off, the ...
0
votes
2answers
11k views

Startup current of an induction motor when using VFD

A 3-phase AC induction motor has the following ratings: rated power: 130kW input power: 140kW rated voltage: 3x400 V rated current: 270A supply freq: 50Hz there is no soft-start The motor will ...
-3
votes
1answer
273 views

Is it possible to drive a PMDC motor with an AC VFD?

I wish to run a PMDC motor of 2.2KW with AC VFD but am not sure if it can be done. I am not an Electronic/Electrical guy. Any suggestions will help.
0
votes
1answer
149 views

Is it possible to over-power a 3-Phase AC motor with a AC Controller?

If I have a 200kw motor controller, and a 30kw motor, is it possible to overpower the motor with the controller? My application is for an electric vehicle (golf car, small bicycle, and so on). I'm ...
2
votes
4answers
831 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
2answers
230 views

Can we use a power amplifier (Class AB) in the inverter portion of a VFD?

I would like to float this idea of using a good (audio) power amplifier in the inverter stage of a sub 1KW VFD. How does this idea sound ? On the plus side, there is far less switching noise, since ...
0
votes
2answers
158 views

Confusion in a VFD manual

I'm using the following VFD for a 3-phase AC motor: ACS550 user manual I want to monitor the power consumed by the motor and the actual rpm. On page 28 and 78 it meantions: • Analog output AO1: ...
2
votes
1answer
273 views

Are there reasons besides audible noise to run a VFD at a higher carrier frequency?

VFDs - variable frequency (motor) drives - output a pulse-width-modulated carrier approximating a sine wave. The carrier frequency is typically variable. I've seen numbers as low as 1 kHz, and as high ...
1
vote
3answers
2k views

Effect of 0 Hz setting on VFD with continuously spinning fan

As part of a HVAC system we have a supply fan and extract fan running on independent VFD1. With the current configuration we usually don't need to run the return fan as the supply fan pressurises the ...
0
votes
4answers
1k views

Can I ground the negative DC bus of a variable frequency drive?

Suppose I have a typical VFD: rectifier, DC bus caps, inverter, feeding a motor. In general it would not be advisable to tie the DC bus to earth ground, because the AC line may also be referenced to ...
0
votes
2answers
62 views

Will a PWM-Enabled MCU Work With Any Motor?

Why do so many MCUs specify what kind of motors they work with? For example: http://www.microchip.com/pagehandler/en-us/technology/motorcontrol/ Surely, the MCU has no concept of a motor and it ...
1
vote
2answers
29k views

How to wire 3 phase motor to VFD

I am trying to wire a new motor to a variable frequency drive (VFD) and having some trouble figuring out how to wire the motor to the VFD. The motor is a 1 HP, 3-phase, 208-230/460 volts, and I'm ...
0
votes
2answers
785 views

Why this pair of IGBT's died silently?

Before some days I have taken a look at circuit which controls AC current's frequency. That circuit was a VFD which looks like: simulate this circuit – Schematic created using CircuitLab But ...
0
votes
2answers
1k views

3 phase VFD/rheostat for motor

I have a 3 phase motor and 3 phase power supply (400V, 50Hz) Currently this motor produces 1.5hp in torque and ~1750rpm. I need it to produce less. My question is: Is the best way to go about this, ...
0
votes
1answer
106 views

A single pump controlled by a VFD

We're testing a 110V single phase Variable Frequency Drive(VFD) connected to a single pump having randomly let's say: R= 10ohm, L= 50mH. And I am putting these numbers to fiqure out the relationship ...
7
votes
1answer
1k views

How do I properly size components for an EMC filter for a variable frequency drive power supply?

One of the products my company designs is, essentially, common bus power supplies for variable frequency drives (VFDs). Thus far we have only sold into the United States. We are considering selling ...
0
votes
2answers
14k views

What is the relation between the stator current and motor rpm for an AC motor?

A 3 phase AC motor is rated values are: 970 rpm, 50Hz, 380V delta 47A. A VFD drives this motor for obtaining a constant wind-speed which rpm is proportional. The thing is when 885 rpm the stator ...