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  1. #1
    Hi guys,

    I have a 2.2KW spindle and inverter from CNC 4 U. I've read the manual but the English is not very clear. Can anyone help about the details for how to connect it together?

    Here is the back of the VFD

    I think from reading the manual that RST (pins 1,2,3) can accept 3-phase mains, but for 2-phase I just connect to any 2 pins, say R and S. Does that sound right? Mains earth will obviously go to pin 9.

    It mentions in the manual about a breaking resistor but it says "P.Pr - Connector for breaking resistor and in another part shows pins P and N with the breaking resistor across them. So what do you think, does the resistor on my inverter go across P+ and PR (pins 4,5). What sort of resistor do I need? Maybe 10R and 25W?

    The spindle motor connects to UVW (pins 6,7,8) but my motor is unmarked. It has 4 pins, which I have numbed in my picture. Pins 1,2,3 connect to each other through 1.6R (I assume the coils of the motor) and pin 4 doesn't seem to connect to anything. The outer part of the plug connects to the body of the motor so I assume this is where the ground goes. If I connect UVW to pins 1,2&3 on the motor does it matter which order I connect them - i.e. pin 1 is U or pin 1 is W?

    Thanks chaps!

  2. WHOA... if this is a 3phase to 3phase inverter DONT CONNECT IT to a single phase supply.... at best it wont work, at worst some magic smoke might escape.... it should say LNE or at least LN if its a single phase in.

    On your other questions....

    Yes 1,2,3 are UVW and the order doesnt matter. If the motor runs backwards swap ONE pair around.

    Breaking resistors are nice to have but not needed. They slow the spindle down after a stop command quicker, esp at the higher speeds, but its something you can live without. As to the value, you'll need more info, guessing could damage the VFD. The value is normally specified in the inverter manual. Typically around 100ohm but too small and you fry the inverter. The wattage rating is typically 10% of the motor rating. See here: Inverter Drive Supermarket | Brake Resistor Calculator for more info, scroll to bottom of page and read the info there first before trying the calculator, then decide its a nice to have for now :)

  3. Ok... just looked on CNC 4U site...they say both single and 3 phase input ??? Have to say I've never come across an inverter that does both in the same box, normally you have to specifiy one or other model. Just downloading the manual....

  4. #4
    This inverter will just rectify the 3-phase input, so you're fine to pick two of the R,S,T pins and connect the single phase supply to those.
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  5. #5
    It looks like the huaqyang vfd. If it is then input mains to R and T. Connect motor to U, V an W and as irving says reverse any two of U, V or W if the spindle runs in the wrong direction. Braking resistor not needed. Look inside the socket on top of the spindle motor, are the connections numbered inside? If not then again check what you have done with a meter to ensure you have the three ends of the motor windings.
    Before running it make sure that you have setup the parameters as stated in the manual. If I remember correctly it was very important to set these up before first running the spindle to prevent damage to it.

  6. #6
    Have alook at this to see if its the same as yours.

  7. Yep, Manual say any two of RST... and nothing about braking resistor value... but you wouldnt want one anyway...

  8. #8
    Thanks for the fast replies!

    I certianly don't want a 220watt resistor, that would be crazy big and expensive.

    WebGoblin, that image appears to be the same as mine. It is Huangyang HY02D223B.

  9. #9
    Quote Originally Posted by Web Goblin View Post
    If I remember correctly it was very important to set these up before first running the spindle to prevent damage to it.
    Can you suggest what settings and values I need to use? I've read it is not good to power up the VFD without the spindle connected so it would be nice to know roughly what settings to go for in advance.

  10. #10
    This is basically the email I got for setting mine up.

    1st set PD013 to 8
    2nd set PD005 to 400
    3rd set PD004 to 400
    4th set PD003 to 400
    5th set PD144 to 3000

    Check all settings are correct except for PD013. This is the factory reset and checking this will reset all the others so make sure you set PD0013 first and dont check it again but do check the others are correct.

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