View Full Version : Newbie Warming problem with motors KL23H286-20-8B

06-08-2009, 05:23 PM

I pardon if this question is answered allready in somewhere in this forum but I didn't find answers so I gathered my bravehood and asked from you,

So, I have Keling KL23H286-20-8B motor and driver KL-6056 for the motor and I'm using Mach3. Why does the motor warms up a lot? On the movements and ALSO on idle position. I have set the current peak from the dip switches first to 3.2A and i also tried 2.7A and it helped a bit. My motor is connected as a bipolar parallel mode. I have a thought that the motors maximum current per phase was about 3.3A? What is the problem?
Or is the problem caused the Mach3 which I can't yet use very goodly?

And a another dump question, what is the easies way to increase stepper motors speed from Mach3? I test my motors in table so I haven't yet calculated correct values for the Steps per mm field. I use 1/32 microstepping.

Thanks for answers in advance!

06-08-2009, 08:51 PM
Steppers run warm to hot on most drives, it's normal. You need to do your motor tuning in mach3 and have the correct settings. Set your kernel speed to the fastest that will work on your pc.

06-09-2009, 03:29 AM
Are my current peak dip switch settings setted correctly for this motor in where position? I mean should it really be setted to 3.2A?
Then the motors is really hot, almost to hot to keep on hands? That could not be normal?

06-09-2009, 04:13 AM

What position is dip switch "4"?

Dip switch "4" controls the idle auto current reduction, it should be off in order to reduce idle current and motor heating.

The motors will still get very hot if you don't have them mounted to something that will dissipate the heat away from them.


06-09-2009, 04:49 AM
When I tested it on 3.2A it was on Full Current position, I don't remember was the full current settings at on or off position but I would change it. I think that might help a lot.

Is there any other tips how to decrease heat in motors?

The mounting to cold iron should be real objection but in my test procedure it is hard to do so.

06-11-2009, 07:49 AM
I setted the idle current mode to "half current", and added current peak level to 2.7A, because of parallel connected motor specifications says that the phase current is 2.8A???
After all, it still warms a lot, Why??? Specialists...????

06-11-2009, 09:12 AM
Gecko's FAQ says that motors wired parallel run much, much hotter than motors wired in series. It's just the way steppers work. If they are less than 150°-180°F, then they're fine.

06-11-2009, 03:51 PM

Average Stepper Operating Parameters

Temperature Rise: 80°C (176°F) or less as measured by the change in resistance method when both phases are energized with constant rated current.

Motor Case Temperature: 100°C (212°F) maximum.

Ambient Temperature Range: -40°C to +65°C (-40°F to +149°F).

Ger21 is 100% correct.


07-27-2009, 11:26 PM
What is your power supply voltage ? It may be too high especially in parallel mode.
Also are the steppers mounted to an aluminum (not steel) frame ?

10-15-2009, 07:00 AM
How could we count a motor's surface temperature?
Also, in what motor's surface temperature should we mount some cooling stuff on it?

10-15-2009, 07:14 AM