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Author Topic: motor direction changes after power outage  (Read 481 times)

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motor direction changes after power outage
« on: May 03, 2019, 07:03:18 AM »
Hello Chaps,
Mach3
this has happened to me at least twice in the last few months
when I switch the system on i find that one or both steppers have changed direction.
I dont know - maybe someone can throw some light on the subject.
We have been experiencing a lot of mains power outages.
In order to alleviate the situation I have installed a 60KW 3 phase  generator set .
could this have something to do with it? maybe phases mixed up?
any discussion will be welcomed
regards fred
think of the trees-- use both sides of the computer paper

Offline reuelt

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Re: motor direction changes after power outage
« Reply #1 on: May 03, 2019, 04:42:31 PM »
Please install power EMI filter for your machine controller box.

If single phase something like
https://www.ebay.com/itm/Single-Phase-AC-Power-Line-EMI-Filter-AC-115-250V-50-60Hz-20A-Suppressor-/123684313976

If three phase
google..
"the gift of God is eternal life through Jesus Christ our Lord"
Re: motor direction changes after power outage
« Reply #2 on: May 04, 2019, 11:23:06 AM »
thanksfor the tip
what does this actually do?
regards

fred
think of the trees-- use both sides of the computer paper

Offline ger21

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Re: motor direction changes after power outage
« Reply #3 on: May 04, 2019, 01:51:11 PM »
this has happened to me at least twice in the last few months
when I switch the system on i find that one or both steppers have changed direction.

I can't think of anything that could cause this, except maybe a bad .xml file, or a pirated Mach3 license file?

A power loss can't change any Mach3 settings.
I can't see how an EMI filter would do anything.
Gerry

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Offline BR549

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Re: motor direction changes after power outage
« Reply #4 on: May 04, 2019, 03:40:59 PM »
Mch 3 currupts teh XML when the PC looses power and cannot fully create /Save the XML. You SHOULD have saved off a copy of a good XML so you can restore it on power up after a power loss. You can create a Batch file to auto transfer teh backup file to the mach3 folder.

(;-) TP

Offline reuelt

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Re: motor direction changes after power outage
« Reply #5 on: May 05, 2019, 01:18:09 AM »
thanksfor the tip
what does this actually do?
regards

fred



Here is a good read:-
https://product.tdk.com/en/products/emc/emc/power-line/technote/pdf/generaltec_power-line_en.pdf

I suspected that motor direction change is a malfunction cause by CONDUCTED NOISE along the power cable(s). Hence I proposed Mains Input EMI filter.
Motor direction is just a signal change at at dir pins of the BOB and not necessarily will corrupt  the MACH3  XML file.

I had a electronically controlled Centralized gas heater that blew 3 times and ALWAYS in WINTER just because I did not have Filters and/or Surge protectors installed. After I put in a filter, I have had over 10 years FREE of problem.


"the gift of God is eternal life through Jesus Christ our Lord"
Re: motor direction changes after power outage
« Reply #6 on: May 10, 2019, 03:16:32 AM »
Thanks for the information. krogerfeedback