VFD, Low Spindle Torque (Mori SL1H Oak)

[MachineMade]

I have been running this machine for about a year. I pretty immediately noticed I have to be very conservative with roughing passes even in aluminum and brass or I will stall the spindle. Tapping is even worse even with smaller taps like 5/16-18 (in alum and brass, forget stainless). I bought this machine from the man who retro fitted it. It was functioning but has needed a few little details finished up. This issue it the largest remaining nuisance.

Could it be that the Volt/Hz curve is not set correctly?

The VFD is a Yaskawa V1000. I will upload a picture of the plate from the (still factory) spindle motor.

I am not sure how it is set now. My previous experience with VFDs involved configuring them at the VFD. The previous owner says it can be done from the PC. I am not seeing anything about that in the Centroid Oak CNC Install Manual. But it is likely due to my inexperience with setting up Centroid systems.

I have some tapping I am tapping 303 second op on an old turret lathe currently and would like to phase this step out as I should not have to . Thanks for any ideas or assistance!

[cncsnw]

There is nothing in the Centroid CNC11 or CNC12 software on the PC that will affect spindle torque.

There is Yaskawa software, called DriveWizard Industrial, which you can run on a PC and which will connect to the VFD through a serial or USB cable. This lets you set parameters on the VFD without having to go through the keypad.

If I recall correctly (and you should verify by reading the V1000 manual), the interface to the V1000 is RS232 serial, but it goes through an RJ45 plug (looks like an ethernet port, but is not).

For occasional use, you will probably find it easier to just use the VFD keypad.

[tblough]

I have a V1000 on a 5hp spindle motor on my work mill. I have no problems with low end torque driving both a 4" insert face mill or a 1/2-13 tap at 640 rpm into 17-4PH. Something is wrong with your VFD setup or your motor. I'll post the parameters I changed in the VFD when I return to work on Monday.

It might be as simple as just needing to run the drive tune.

[MachineMade]

There is nothing in the Centroid CNC11 or CNC12 software on the PC that will affect spindle torque.

There is Yaskawa software, called DriveWizard Industrial, which you can run on a PC and which will connect to the VFD through a serial or USB cable. This lets you set parameters on the VFD without having to go through the keypad.

If I recall correctly (and you should verify by reading the V1000 manual), the interface to the V1000 is RS232 serial, but it goes through an RJ45 plug (looks like an ethernet port, but is not).

For occasional use, you will probably find it easier to just use the VFD keypad.

I should have an rs232 to usb in my Ham gear or the one to the BTR board on the Old Hitachi Seki but it may become an unnecessary side tangent. That is more inline with what I would expect. Thanks!

[MachineMade]

I have a V1000 on a 5hp spindle motor on my work mill. I have no problems with low end torque driving both a 4" insert face mill or a 1/2-13 tap at 640 rpm into 17-4PH. Something is wrong with your VFD setup or your motor. I'll post the parameters I changed in the VFD when I return to work on Monday.

It might be as simple as just needing to run the drive tune.

That would be great! Yes there should be no problem with this hp/torque wise. I suspect it is likely VFD configuration. The previous owner said he ran one of the tuning functions of the drive and afterwards it wouldn't turn the spindle. I figured one of you had probably been down a similar road. Thanks for the help!

[tblough]

You really don't need the software, PC, and cable. There are only 10 or so parameters to change on the drive and it's very easy from the drive front panel. Personally, I wouldn't bother with the added hassle.

The V1000 is a vector drive, not a volts/Hz drive so you should have full torque at 0 RPM. Here's the drive manual so you can read up on how to change parameters. I'll post my setup on Monday when I get back to work.

[tblough]

Here are the setting I have on my 5Hp V1000:

Code: Select all

CENTROID M400 WITH YASKAWA V1000 INVERTER

These parameters represent the setting that are different from the factory presets.

Setting parameter A1-03 to a value of 2220 will return
drive to factory default settings.  Set back to a value
of 0 before entering new parameter values.  If this does
not work, check parameter 02-03.


Parameter
A1-02	02   open loop vector control
b1-03	00   ramp to stop
C1-01	2.0  start accel
C1-02	3.0  stop decel
C6-01	00   heavy duty drive
C6-02	04   carrier frequency 10.0 kHz
D2-02	09.05  lower frequency limit (determined by spindle tuning speed w/Centroid)
E1-01	214.0  input voltage
E1-04	126.0  max output frequency (determined by spindle tuning speed w/Centroid)
E1-05	230.0  max output violtage (motor rating)
E1-08	13.8   output frequency voltages
E1-10	2.9             "
E1-13	230.0           "
E2-01	12.3   motor rated current
E2-02	1.86   motor rated slip
E2-03	4.69   motor no-load current (auto tuned)
E2-05	0.776  motor line-to-line resistance (auto tuned)
E2-07	0.45   motor saturation (auto tuned)
E2-08	0.72   motor saturation (auto tuned)
E2-11	3.73   motor rated output (auto tuned)
H4-01   108    analog output = motor power
L3-01   02     intelligent stall prevention acceleration
L3-04	03     intelligent stall prevention deceleration
{/code]

[MachineMade]

Thanks!

[Cliff Snyder]

I just got done setting up my a1000 vfd to control a 10hp router spindle so I have a few learnings. 1. The drive wizard software is available for free once you register on the website and it makes it very easy to set up. 2. A1000 hooks to pc via eithernet 3. enter the basic motor parameters then choose vector drive and then autotune, my torque at very low rpm was actually significantly higher than at rated rpm.

[MachineMade]

I just got done setting up my a1000 vfd to control a 10hp router spindle so I have a few learnings. 1. The drive wizard software is available for free once you register on the website and it makes it very easy to set up. 2. A1000 hooks to pc via eithernet 3. enter the basic motor parameters then choose vector drive and then autotune, my torque at very low rpm was actually significantly higher than at rated rpm.

That's very helpful! I just revisited this post as I've been putting this side tangent off. But I am tired of tuning my programs around a poorly tuned drive. Time to bite the bullet...