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Author Topic: Drivers only power up for a short time  (Read 2499 times)

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Drivers only power up for a short time
« on: February 26, 2017, 06:20:43 AM »
Hi all, great forum u guys have going
I have built a couple of small cnc tables before, now this one is bigger and running duel x axis motor and one single y axis
Anyway have couple of issues. When I turn on Mach 3 on computer and turn on power to the power supply for drivers, no green led is lit on drivers, which is normal,  when I hit reset on Mach3 drivers power up and green leds on and motors lock but within 5 sec drivers switch off or loose power.
Then when I move any axis, drivers power up again for another short while
Only way round it is to keep moving axis for about a minute and then drivers will stay powered,  it's not a big problem but am afraid of maybe doing long term damage

Regards

Offline Tweakie.CNC

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Re: Drivers only power up for a short time
« Reply #1 on: February 27, 2017, 03:01:37 AM »
Can you tell us the make / model of the breakout board and the motor drivers you are using ?

Tweakie.
PEACE
Re: Drivers only power up for a short time
« Reply #2 on: March 01, 2017, 09:35:39 AM »

Hi,  the drivers are mirco stepping CW 885
and the break out board is CPO -10V
both brought from www CNC4 you.

regards

Offline Tweakie.CNC

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Re: Drivers only power up for a short time
« Reply #3 on: March 02, 2017, 01:42:33 AM »
Could you carry out a measurement ?

Use a multimeter across your power supply to make sure the Voltage stays up when your drives go into low power (standby) mode.

Does setting SW4 to 0 on your drives remove the problem ?

Tweakie.
« Last Edit: March 02, 2017, 02:24:13 AM by Tweakie.CNC »
PEACE
Re: Drivers only power up for a short time
« Reply #4 on: March 02, 2017, 02:21:11 AM »

Ok will do,

So I guess when leds goes out Does that mean they go into low power mode ?

Regards

Offline Tweakie.CNC

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Re: Drivers only power up for a short time
« Reply #5 on: March 02, 2017, 02:26:40 AM »
Yes.

The 'half current' mode is overridden by the switch SW4.

Tweakie.
PEACE
Re: Drivers only power up for a short time
« Reply #6 on: March 02, 2017, 02:47:49 AM »

ok just heading to work now
Re: Drivers only power up for a short time
« Reply #7 on: March 02, 2017, 03:39:40 AM »

My luck,,
forgot to say this problem always happens nearly everytime I switch on in mornings, the very odd morning its ok,   and this is one of them,
so checked power on supply end, power is staying the same 48.1 v,
but I suppose can not check for sure now when problem is not there today

but I would be happy if I have to leave switch 4 to off, for it to work ok,
when I walk away from machine I always hit reset button on mach 3 anyway.

would you be the man to ask this,

could I send a rough break down on what I have ,ie  what rack/pinion, pinion size,  tooth belt reduction size, what steps I have drivers set to, etc   
just to make sure I am running the motors as smooth as I can,

regards.
   

Offline Tweakie.CNC

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Re: Drivers only power up for a short time
« Reply #8 on: March 02, 2017, 04:43:54 AM »
That's always the way - things never seem to misbehave on demand.  :)

Try with SW4 to off for a while and see if that helps but check motors do not get too hot - they should be hot to the touch but not too hot that you cannot hold your hand on them for a while.

By all means post the details of your set-up, the hive mind will almost certainly spot anything that can be improved.

Also perhaps post your  <profile>.xml  file from your Mach3 folder then your Mach3 settings can be checked. Copy and rename this file to DEM.xml before posting (using the Reply tab and Additional Options...).

Tweakie.
PEACE