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Author Topic: Outputs on at startup  (Read 2943 times)

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Offline Quin

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Outputs on at startup
« on: November 05, 2012, 07:52:56 PM »
If I turn on my machine after a computer boot-up and then make a home switch active (active low), outputs #1 & 2 become active (active high).  This condition goes away after cycling the home switches a few times.  It only happens after a computer boot-up.  Any solutions??

Offline Fastest1

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Re: Outputs on at startup
« Reply #1 on: November 06, 2012, 05:25:46 PM »
Do you have the charge pump enabled?
I want to die in my sleep like my grandfather, not like the passengers in the car! :-)

Offline Quin

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Re: Outputs on at startup
« Reply #2 on: November 06, 2012, 06:58:25 PM »
I do not have a charge pump.  The Enable pin has 5volts all the time.  I was considering adding a charge pump so I simulated its action by putting a switch in the 5v line to the EN pin.  When I power up the system without EN at 5v, the steppers flutter and sputter.  This lead me to believe that the cause is elsewhere.

Offline Fastest1

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Re: Outputs on at startup
« Reply #3 on: November 06, 2012, 07:25:53 PM »
What BOB and drivers are you using?
I want to die in my sleep like my grandfather, not like the passengers in the car! :-)

Offline Quin

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Re: Outputs on at startup
« Reply #4 on: November 06, 2012, 08:45:33 PM »
Using a C10 BOB from CNC4PC and Gecko G-201X drivers

Offline Quin

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Re: Outputs on at startup
« Reply #5 on: November 07, 2012, 06:12:19 PM »
Fastest1,

Any more thoughts on this one?

Quin

Offline BR549

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Re: Outputs on at startup
« Reply #6 on: November 07, 2012, 06:34:59 PM »
IF your drivers are not enabled they should NOT even twitch much less move. WHen a PC boots up it twiddles the LPT ports looking for things. This will cause movements IF you have the drives enabled without a chargepump.

Best bet is to boot up with the drives turned OFF then after the Computer is fully online turn the drives on. OR just use a charge pump circuit.

(;-) TP
« Last Edit: November 07, 2012, 06:38:25 PM by BR549 »

Offline Quin

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Re: Outputs on at startup
« Reply #7 on: November 07, 2012, 08:38:30 PM »
A point of clarification, outputs 1 and 2 are for mist and flood cooling which are the problem.  They (pins 1 & 14) energize solid state relays. The stepper motor outputs react perfectly at computer boot up.

Quin

Offline Fastest1

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Outputs on at startup
« Reply #8 on: November 08, 2012, 07:45:50 PM »
I run a PMDX 126 and don't need any extra parts to enable the charge pump. I set it up in Mach. I would think it works the same way.
I want to die in my sleep like my grandfather, not like the passengers in the car! :-)