Originally Posted by
Padawon01
-% of RPM is being controlled by the motion control software.
-Yes, I am aware that running an air-cooled spindle at too low an RPM can cause overheating and damage. Is there an actual hard calculation for this number, or is this an arbitrary calculation? How did you arrive at 7200 RPM? Why not 7000 RPM or 7250 RPM? Genuinely interested in how 7200RPM is the magic number. (Personally, I stay at or above 8000 RPM)
-But it does. Not trying to argue, but I entered in the motor parameters and a few of the other basic set up parameters, selected auto-tune, and it ran and updated parameters P2.06-P2.10 automatically.
-I have 300Hz entered for this, it was a typo.
-Where do I find this information? Unfortunately, I did not receive anything with my spindle that outlines minimum RPMs. Just wondering if there is a calculation or formula for this? I would like to have a better understanding of how this is determined.
- both are fine
- P0.01 is the correct setting
- Problem was discovered to be at the motion control. I am using a Openbuilds Blackbox controller and the 0-10v command signal works fine. However, I noticed (and it is outlined in the VFD manual) that if there is a jumper across S1-COM prior to powering the VFD on, it prevents the inverter from running (note on page 48 beneath figure 6.12).
To solve this, I attempted to use the relay that is included in the Blackbox Motion control (grbl). Unfortunately, when the motion control powers on, it cycles the relay and make the VFD think that the S1-COM had a closed circuit condition prior to power up, preventing it from running.
The tech support at Openbuilds suggested using "use spindle DIR as ENABLE" - this did not work for obvious reasons. What ends up happening is that the Blackbox cycles the relay upon start up which briefly causes a close circuit condition across S1-COM, and then cycles the relay a second time when connecting to the controller with a computer. The only options to correct this are to alter the coding in the grbl firmware or simply install an external relay, switch, or simple logic circuit to circumvent it. You may not be interested in this information, but I am compiling it here for others who may come looking for it.