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Author Topic: Help, motors only humming but don't rotate  (Read 7475 times)

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Help, motors only humming but don't rotate
« on: December 25, 2007, 07:10:02 AM »
My old computer was broke down and now i have a new IPC with touch screen  :).
I only can't get my motors running.
I've tried different motors, and power supply's but i'm not able to get even one axis running (Axis X)
I get 4.93 volts in step and dir pin and the motor wants to run but is only humming.
When i change the amount of steps per from 400 to 4000 it even makes a higher humming.
Please who can help me? (XML file attached, only look at the X-axis)

Thank you in advance,

Arjan

Offline jimpinder

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Re: Help, motors only humming but don't rotate
« Reply #1 on: December 25, 2007, 08:24:03 AM »
My wife says that my CNC with Mach3 will not work on Christmas day !!! I don't know how she knows.

Having said that - you haven't really said a lot - what are you expecting. Have you got your motor attached to a driver card etc. Has this worked before ??? In other words what have you done.

New PC - download Mach3 - connect cable to printer port - (connect other end to a breakout board) - connect leads from pins 2 and 3 to step and direction pins on the driver card (and also a 0v return wire) - (if you have eight wire motors (four segments) then cross couple the wires to give four wires (two segments)) - connect driver card outputs to the four wires of the motor. Connect power supply to the card.

On the computer - mach3/ports and pins/port ********* selection - enable port 1
                                                          motor output - show port 1, pin 2 as the step for A axis, port 1 pin 2 as the dir for A axis
Make sure both are enabled in the first column, and you can tick active low on both pins (but you might have to reverse this)
Make sure there is no axis enable switch or pin on your driver card.

That should be it - away you go.

If you have done all that and it still doesn't work get back on the forum!!

Although how long I can stay on today is in the lap of the household authorities.
Not me driving the engine - I'm better looking.

Offline Chaoticone

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Re: Help, motors only humming but don't rotate
« Reply #2 on: December 25, 2007, 11:05:53 AM »
Try going to motor tuning and turning your accel way down.

Brett
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!
Re: Help, motors only humming but don't rotate
« Reply #3 on: December 26, 2007, 07:42:14 AM »
It worked on my old computer with TurboCNC under DOS.
The touch screen must run under WINXP so that's why i'm trying Mach3.
I've slowed down the acceleration up to 0.2 and velocity to 20 but that didn't make any difference.
Any ideas?

Offline Hood

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Re: Help, motors only humming but don't rotate
« Reply #4 on: December 26, 2007, 08:38:52 AM »
IPC = Industrial PC????
please give us specs of the PC.
You say you have 5v on bothe the setp and Dir pins, is this correct?
Does the Dir pin go low when you jog one way then the other go high?
Hood
Re: Help, motors only humming but don't rotate
« Reply #5 on: December 26, 2007, 10:10:29 AM »
Yes, IPC is industrual PC, a Distec with 2 GHz Celeron CPU and 128 mB RAM

When I jog I have the following signals: In + direction; Step 4.9V, Dir 0V.
In - direction; Step 4.9 Volt, dir 4.9 Volt.
I've changed the phases also several times (motor is wobling like the phases are mounted wrong).
Can I measure the phase outputs of the stepperdriver?
Arjan

Offline TonyP

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Re: Help, motors only humming but don't rotate
« Reply #6 on: December 26, 2007, 10:46:30 AM »
Make sure the step pulse is set to to a reasonable figure - above 5 us. My own drives won't work with less than 6. Presumably you haven't changed the driver or motor since it worked on Turbocnc so there's no need to worry about the motor phase- leave it as it was.

Tony

Offline Hood

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Re: Help, motors only humming but don't rotate
« Reply #7 on: December 26, 2007, 11:00:23 AM »
OK, the PC should be OK, bit low on memory but that shouldnt be your problem.
You are getting the Dir changing like it should but I am a bit surprised you are seeing 4.9v on the step pins when jogging. Are they at or near Zero when at rest? What are you measuring the voltage with, if a digital Voltmeter then I would say you should only be getting mV when jogging.
 I notice in your xml that you have Enable 1, 2 and 3 all connected to Port 1 Pin1, is this correct for your setup? Do your drives need enables and are they connected properly?
 Also you have Output 1 enabled but set to Port1 Pin0, this cant be correct so if you are not using Output1 then best to disable it, its probably not anything to do with your problems but you never know.

Hood

Offline TonyP

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Re: Help, motors only humming but don't rotate
« Reply #8 on: December 26, 2007, 11:55:53 AM »
Hood,
wouldn't the active hi/lo make a difference to the voltage measured?

Tony

Offline Hood

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Re: Help, motors only humming but don't rotate
« Reply #9 on: December 26, 2007, 12:16:40 PM »
Hood,
wouldn't the active hi/lo make a difference to the voltage measured?

Tony
Yes that is correct Tony but I was using the xml supplied by Exester so I presume the  active state to be correct.
Hood