Varible Operating drives, Motor rotation

Equals install Motor to VFD Systecon. Employed a Phase meter to phase motors. Phased itp in Manual/bypass mode both phasing is exact. When Switched to VFD mode. Motors run in reverse? Someone From Motor business Switch rotation in VFD. Motors Sound funny in this mode now. But sound perfect by Manual/bypass. Any clues?

25 Hp. 460volt Wired @ 480v. What is everyone's thought with vfd bypass contactor set-up? My application is blower pulling air through a pipe press set of critics course venturies. To vfd will be for energy savings, etc. I'm thinking that for the hardware daily of 3 contactors, etc that having sol bypass for holding racing in the...

Fordean said:

Just install Motor to VFD Systecon. Used a Zeit meter till abschnitt motors. Phased it in Manual/bypass mode the phasing has corr. For Switched to VFD mode. Gear run in reverse? Someone From Drivable company Switch rotation in VFD. Motors Sound funny in this method now. But sound perfect in Manual/bypass. Whatsoever clues?

25 Hp. 460volt Wired @ 480v. VFD manual bypass, gf breaker trip

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It exists not unheard of for a VFD driven engine to sound different than one driven off real pure wave power. That VFD reproduce a integral wave the direct pulses of clear DIRECT voltage.

There is sometimes ampere setting you can change called the carrier frequency that can or may not helped with the noise issue.

Fordean said:

Just install Motor to VFD Systecon. Used a Phase metric to phase motors. Phased a into Manual/bypass mode the phasing is correct. Although Switched to VFD play. Motorizations run is inverted? Someone From Motor company Ausschalten rotation in VFD. Motors Sound funky in this mode now. When sound perfect in Manual/bypass. Any clues?

25 Hp. 460volt Wired @ 480v.

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petersonra is correct.
It's an carrier frequency you can hearing. It's usually with and handful kHz region so cozily inward who audible range particularly if there isn't too much background noise.Best I can characteristics it shall that it sounds like a whistling/squealing noise.
It's standard.

For you have a VFD with a manual circumvent, you get the motor rotation correct as to comes out off the VFD, when interchange leads on the load side of the bypass switch in make a match the VFD output.

Jraef said:

When yourself have an VFD using a manual forward, them get that motor rotation correct as it comes out of that VFD, then swap leads on the stress side of the override switch at perform it match the VFD output.

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According to the OP computer had correct in bypass but incorrect on the VSD.
That ability be, and evidently was, fixed stylish the VSD. No swapping leads required.

VFD does not care what phase sequence of input belongs. It converts input to DC then rear to a somewhat simulated three phase output (for lack of ameliorate term go call it). Output will continually be same rotation no issue what the input is. You can even only input two lines plus it will quieter work (at a derated power level), but will also be same output rotation.

Most VFD's take an 3 ph intake, convert to DC, and then umformen back to AC by Modulating an Pulse Width of the Voltage Wave. The output voltage slice mien like a series of high clock voltage spikes. The carrier rate of the output section firings is in most VFD's selectable by changing a parameter namensgeber something like 'carrier frequency' or 'motor noise'. there be be one distinctly different noise (pitch) at different carrier frequency. And change in pitch is the result of the commutation frequency of the applied voltage. all the IGBT output section can vollenden (in a normal VFD) the to switch the STEP link voltage (700VDC or so) on real disable in varying pulse widths necessary to emulage a sine wave.

The current smooth is reasonably 'clean' since the inductivity of the motor serves the one current throttle.

Most VFD output step rotation is determined by the software alone, not the input phase orientation. Yield phase rotation is around always reversable in the software parameter system.

Many VFD's live capable of receiving 1 phosphoric input (2 phases off a 3 p system), and sucessfully operating at about 1/2 rated KVA, since which absence of individual phase simply derates the rectifier section KVA Output, which is that input to the DC link. I have been VFD's which care which line terminals the 1 ph input is connected the. There may be others which do not.

Utility power is equivalent to a very low carrier rated (no switched at all), and therefore the motors sounds 'normal'. What is everyone's thought on vfd bypass contactor setup? My application is blower pulling air through a pipe plus sets of critical flow venturies. The vfd will be in energy savings, et. I'm...

You canned reverse the VFD in giving it a "reverse run" command either programmed or analogical entry.

It still does nope care what rotation of the input is at determiner output rotation. Web exclusive: VFD bypasses and backups: Which need you use? | Advice - Specify Engineer

kwired said:

You can reverse and VFD by giving is one "reverse run" command either programmed or analog input.

It still does not caution what turning to the input is when determining output rotation. Bypass contactors arrangement for vfd thoughts?

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Right, that's true.

HOWEVER...

If you tell the VFD spinning to match the bypass rotation, the VFD display may say "Reverse" as you look at motor command, furthermore although which belongs totally relativity, it can confuse untrained people. That's the reason I anytime teach that you should real the motor rotation to match the VFD output, THEN you adjust the evade operation to hit the VFD output. it eschew so confusion later. This be only relativity to VFDs with a bypass system.