I did not make myself very clear, sorry. The BEMF calibration should be much better using the mass of the loco. The PID parameters need something to "work against"
I don't think the BEMF calibration will help the noise.
I would also check to see if this motor has noise caps and/or chokes, and remove them.
On the statement about "runs very quietly", BS really BS.. 16 KHz can be hear by most humans... the person writing that statement must be hearing impaired compared to a young person.
Up until my 40-50's I could hear 20 KHz... 16 is irritating... that is old technology, old switching supplies hummed also until they moved their PWM frequency to ultrasonic...
Greg
Greg etal - I'm not familiar with motor noise caps and/or chokes.........what do they look like and where would they be? I removed the factory circuit board to install the ESU 5XL decoder and I don't see any other devices around the motor although I only removed the bottom cover to add some new grease and silicone lubricant to the axles, so maybe I missed them?
The locomotive operates well with just using the Linear and Buhler/Kiss motor settings on the ESU LokProgrammer. So, if using the Auto Calibration of the Motor feature won't improve the motor noise, the only issue I'm interested in correcting, then I don't think I need to do the "on the track" Auto Calibration procedure. I was going to leave CV9=16 for 16kHz PWM frequency based upon the statement in the Massoth documentation for their XLS sound decoders, but if you recommend putting it back to the original 40kHz I'll do so. Like Phil, I'm thinking maybe this old motor installed at the LGB factory in the 2000 - 2002 timeframe, even though not used much, could be acting up with the noise. But again, the locomotive operates well, and doe not make the noise when I turn OFF the Load Control/EMF setting on the LokProgrammer. And another data point, Dave Miller indicates he had one of these LGB Rugen locos with the unique motor and found the Load Control/EMF needed to be ON for it to operate well.
So, here's my proposed course of action:
1. Keep the LokProgrammer's Load Control/EMF setting ON;
2. Use PWM frequency 16kHz or 40kHz depending on your advice;
3. Live with the motor's slight hum noise which can't be heard anyway when the sound system is operating;
4. Replace the motor down the pike when/if it fails.
Thoughts?