VFD Braking Resistor Issues with Spindle Kit

Spindles and ATCs
1

I have a spindle kit (1.5kW, 110v, 80mm, 2 pole, water cooled) installed on an AltMill along with the 300W braking resistor. As far as I can tell, the VFD behaves as if the resistor is not present. Is there some parameter that needs to be changed to enable the external resistor and allow for ~3 second deceleration times?

Current observations:

  • The spindle deceleration time (P0.0.12) cannot be set lower than ~4.5 seconds without causing Err06. This happens regardless of whether the resistor is connected.
  • The resistor leads are connected to the P+ and PB terminals of the VFD, and a multimeter shows 250 ohms across the screw terminals.
  • With the resistor connected and a deceleration time of <4.5 seconds, no voltage is measured across the P+ and PB terminals at any point during the attempted deceleration (so no current is passing through the resistor).
  • The displayed bus voltage (P9.0.04) is 182V at 0 rpm, 179V at 24000 rpm, 228V when braking from full speed with P0.0.12 = 5.0 seconds, and >242V when braking with P0.0.12 = 4.0 seconds before throwing Err06.
3

This article has the information on the resistor, which it looks like it checks out.
Braking Resistor

The last sentence in the article.
As stated earlier this comes preset to 006.0 which equates to 6 seconds and with the braking resistor you can set it as low as 003.0 without error, however your results may vary.

4

Same here, I one on my Altmill, it didn’t change anything and I haven’t had time to contact support for this. I don’t see any answer here for some reason? I have the PWN 2.2 spindle on mine. Did you figure it out?

5

Nope, haven’t figured it out yet. I’ll probably contact support once I’m back from vacation. I don’t think it has anything to do with the Altmill/SLB-EXT since it has the issue even when using the VFD keypad for spindle control.

Did you get the spindle kit or the spindle system?