[suganesh95]

mactec54

I have changed the first parameter to 400Hz as said by you.
I am again attaching the pdf and those are the complete set of parameters that the VFD supports. rest all are just connection diagrams and maintenance instructions.

Also what about the PWM frequency settings? i.e parameter P12.19 ? is 10kHZ fine ?

[mactec54]

mactec54

I have changed the first parameter to 400Hz as said by you.
I am again attaching the pdf and those are the complete set of parameters that the VFD supports. rest all are just connection diagrams and maintenance instructions.

Also what about the PWM frequency settings? i.e parameter P12.19 ? is 10kHZ fine ?

You need to set the other Parameter as well, the minimum speed these spindles run at is very important, if you want to get a good life from your spindle

P00.09=100

Default is normally fine for any PWM Parameters I doubt that you are doing anything related to those settings

[suganesh95]

You need to set the other Parameter as well, the minimum speed these spindles run at is very important, if you want to get a good life from your spindle

P00.09=100

Default is normally fine for any PWM Parameters I doubt that you are doing anything related to those settings

Ok will set that ! But the pwm settings did have a major change as mentioned by CitizensOfDreams ! The default was 6kHz now i have it set to 10kHz and the noise (If you check the video you can hear the noise) disappeared ! So is 10kHz PWM frequency all right ?

I will be using this spindle for my cnc.

Also what does main frequency mean ? Also what do these mean , max freq., Middle freq. And min freq.

Thank you

[mactec54]

Ok will set that ! But the pwm settings did have a major change as mentioned by CitizensOfDreams ! The default was 6kHz now i have it set to 10kHz and the noise (If you check the video you can hear the noise) disappeared ! So is 10kHz PWM frequency all right ?

I will be using this spindle for my cnc.

Also what does main frequency mean ? Also what do these mean , max freq., Middle freq. And min freq.

Thank you

You are mistaken it is called Carrier Frequency, and CitizensOfDreams told you to cut it in half which would not of been of any help at all, and I posted for you to use a max of 10 only if you can measure the internal temperature, so 8 is your safe setting 10 is ok if you can watch your temperature Post 18

The noise disappeared because you set the main frequency correct to 400, I also explained this in the previous posts

[mactec54]

The default was 6kHz now i have it set to 10kHz and the noise (If you check the video you can hear the noise) disappeared ! So is 10kHz PWM frequency all right ?

Thank you

A good warning as you set the Carrier Frequency higher the temperature increases, as I have said there is a happy place for this setting for these spindles

The other problem you have the higher you go you can expect to have a low life for your spindle bearings, Unless you can ground the spindle rotor which I doubt that you could do this

Carrier frequencies above 5 kHz are likely to cause bearing damage unless protective measures are taken, and this protective method is by Grounding the rotor this then eliminates any Bearing damage

So ( 2 ) things come into play Bearings and Temperature when you use a high Carrier Frequency setting

[suganesh95]

A good warning as you set the Carrier Frequency higher the temperature increases, as I have said there is a happy place for this setting for these spindles

The other problem you have the higher you go you can expect to have a low life for your spindle bearings, Unless you can ground the spindle rotor which I doubt that you could do this

Carrier frequencies above 5 kHz are likely to cause bearing damage unless protective measures are taken, and this protective method is by Grounding the rotor this then eliminates any Bearing damage

So ( 2 ) things come into play Bearings and Temperature when you use a high Carrier Frequency setting

Thank you for your guidance! Will do as said by you ! I have grounded the spindle using the pin 4. Isnt it supposed to work ? If not how do i do it ?

[mactec54]

Thank you for your guidance! Will do as said by you ! I have grounded the spindle using the pin 4. Isnt it supposed to work ? If not how do i do it ?

Did you check the continuity between the 4th Pin and the Spindle Body, most are not connected, see photo below most have to do this, only some of the better manufactures have the Ground connected inside the spindle

Don't get confused with Grounding there are two different things I'm posting here, Grounding of the spindle is number ( 1 ) and the most important to focus on

Number ( 2 ) is then Rotor Grounding and is not a big problem unless you are using your spindle everyday for production

The easiest way to over come Rotor voltage and Bearing damage is to use Ceramic Balls in the Bearings which some offer, but this only protects the Bearings, the Rotor it's self has to be Grounded to solve this completely, which means modifying the spindle which most users can't do, a photo of what is happening on a normal VFD Driven Ac motor so you have an understanding what happens if the Carrier Frequency is to high, the higher this is set the higher the Rotor Voltage will be

A brush like this can be mounted on the spindle shaft, this is not practical for these high speed spindles, so I have been testing a single point brush on the end of these high speed spindles, the high speed part is the problem as most materials wear to fast to be used for rotor Grounding on these spindles

[suganesh95]

Did you check the continuity between the 4th Pin and the Spindle Body, most are not connected, see photo below most have to do this, only some of the better manufactures have the Ground connected inside the spindle

Don't get confused with Grounding there are two different things I'm posting here, Grounding of the spindle is number ( 1 ) and the most important to focus on

Number ( 2 ) is then Rotor Grounding and is not a big problem unless you are using your spindle everyday for production

The easiest way to over come Rotor voltage and Bearing damage is to use Ceramic Balls in the Bearings which some offer, but this only protects the Bearings, the Rotor it's self has to be Grounded to solve this completely, which means modifying the spindle which most users can't do, a photo of what is happening on a normal VFD Driven Ac motor so you have an understanding what happens if the Carrier Frequency is to high, the higher this is set the higher the Rotor Voltage will be

A brush like this can be mounted on the spindle shaft, this is not practical for these high speed spindles, so I have been testing a single point brush on the end of these high speed spindles, the high speed part is the problem as most materials wear to fast to be used for rotor Grounding on these spindles

Woah ! I didnt know about this ! Thanks for the info !
The back cover of my spindle is sealed ! It wont come off, probably because i purchased this one with warranty. So i cannot open and check if the spindle is grounded the way depicted in the first pic. Is there any other means by which i can check if its grounded? And i dont think my spindle has ceramic beraings they are just normal bearing (4pcs Bearing (2*C7004+2*C7002) ). Also its not for any production purpose, its just for my personal hobby machining and engraving.

I bought the following spindle from aliexpress : https://www.aliexpress.com/item/Spin...e43c4c4dMsQbSD
You can check for further info.

Also can you please direct me to any website which shows how a rotor shaft can be grounded without much hassle.

Thank you !