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Author Topic: Drivers only power up for a short time  (Read 1913 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.
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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 »
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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.
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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.
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