Originally Posted by
momus_cnc
Have you tuned the motors with the trim pots yet? Any potential sources of electrical signal noise?
For comparison, I'm running a G540 from Keling, with the resistors at the drive end of the motor wiring (adjustable EZ-G540 resistors from Soigeneris.) When the drive is powered up, I can hear a very faint hum from the motors. Just loud enough that I can hear that the power is on, but not loud enough to be disconcerting in any way. If the shop is completely quiet I can just hear it from across the (very small) room, but most any sound, people talking for instance, will totally drown it out.
My motors get slightly warm to the touch after running, but never what I would consider to be hot. Never uncomfortable to rest your hand on. They are rarely much warmer than body temperature, often not much warmer than room temperature (assuming room temp to be 70-75.) I haven't measured this, but I'd guess they are around 100-110 degrees after a lengthy session. They stay much, much cooler than my old motors that were powered by a Xylotex.
Describing sounds can be really difficult. It could be that what you are hearing is within the range of normal. There was so much discussion about the cncrouterparts placement of the resistors at the motor end, and debate whether that was OK, that I went with Keling in the end. At that point in time, Gecko's position was that it was simply incorrect and that the G540 was never intended to be wired that way. Not sure what the latest word is. But ultimately most people seem to find the performance is fine.
Let us know what you hear from cncrouterparts.
-Bob