Noisey motors when idle. Normal?

[Propaganda]

Hi Everybody.

I am bench testing my first setup using Keling 381oz 4wire steppers and a G540. The PSU is a 48v 7.3A switching power supply. When idle the steppers make quite a wide spectrum of different noises. Sometimes I hear a high pitch squeal (chirping) other times I hear a low frequency hum. They also like to vibrate slightly. There is no change if the G540 is plugged into the computer or not.

Is this normal?

Thanks.

[beliefdrive]

Check power capacitor . i 'm think you'r mistake conect, it need less than 30cm with dirver

[Propaganda]

Well, there is no power capacitor per say, it's a switching PSU. The PSU is a MeanWell authentic. However the power leads were 31cm and I lowered them down to 20cm for good measure which produced no difference.

After getting information from another thread it appears that a little motor noise at idle is nothing to be concerned about, considering the motors still are energized at 70% power, but I am still not 100% sure.

[beliefdrive]

if you use switching psu, you need add diode to protec PSU.

[ger21]

Have you adjusted the Trimpots?

ADJUSTING THE TRIMPOT This trimpot adjusts the motor for the smoothest possible low-speed operation. Set the motor speed to about 1/4 revolution per second, and then turn the trimpot until a distinct null is noted in the motor’s vibration. This will result in the most even microstep placement for a given motor and power supply voltage.

[TOTALLYRC]

If it is an early version there was a minor problem in that there was some current running around and making the motors hiss.
This applies to the early G250/251 and I think the early G540 but I am not certain. The fix is simple but I don't remember where I saw this and I have yet to do it to my machine but IIRC it was just a resistor to be added by the user.
The newer ones have had the problem fixed. Mariss has a nice write up of it somewhere. Sorry I don't have all the info but the mind is in Jello mode tonight.

Mike

[Chris D]

You add 1k (I think that is the correct value) resistors to each signal ground wire. This minimizes the hiss.

Chris

[ger21]

Took a while, but i found the info.
http://www.cnczone.com/forums/showpo...44&postcount=2

[Propaganda]

Thanks for the information, I will try the posted suggestions in a few days. ATM, my equipment is packed up because I am moving out of state.