Re: Progress
Posted by
Peter Smith
on 1999-09-19 14:29:09 UTC
-----Original Message-----
From: Bertho Boman <boman@...>
To: CAD_CAM_EDM_DRO@onelist.com <CAD_CAM_EDM_DRO@onelist.com>
Date: Sunday, September 19, 1999 6:31 PM
Subject: Re: [CAD_CAM_EDM_DRO] Progress
Bertho
Thanks for the advice , I do not have a scope available, I have tried the
Board with no load and nothing gets hot, I have tried the output sockets
with a logic probe, and all appear to be working OK, I don't know whether to
buy a couple of new ICs for one axis and try that,
I will see what Dan has to say and go from there.
Best Wishes
Peter Smith
and that they alternately blink as you send a slow move command. Watch out
IRFZ34 I assume these to be OK, or not ? ).
difference in performance, so assume all of these to be OK, or all U/S
the A a side of the axis remain cold, (see later comment on 13FR100
Resistors)
side A a .
no resistance, on the other one I cannot get a reading.
From: Bertho Boman <boman@...>
To: CAD_CAM_EDM_DRO@onelist.com <CAD_CAM_EDM_DRO@onelist.com>
Date: Sunday, September 19, 1999 6:31 PM
Subject: Re: [CAD_CAM_EDM_DRO] Progress
Bertho
Thanks for the advice , I do not have a scope available, I have tried the
Board with no load and nothing gets hot, I have tried the output sockets
with a logic probe, and all appear to be working OK, I don't know whether to
buy a couple of new ICs for one axis and try that,
I will see what Dan has to say and go from there.
Best Wishes
Peter Smith
>bad happened and you are now trouble shooting it.
>Peter,
>I do not know anything about your circuit or problem except that something
>any load (stepper) connected to it. Nothing should get too hot.
>You might try as an intermediate step, to just fire up the board without
>if that helps.
>If it does, disconnect the drive signal to the stage that gets hot and see
>circuit tries to turn on both outputs at the same time.
>My guess is that you either has a shorted output transistor or the drive
>instead of stepper windings as loads. You can see which ones are turned on
>An other crude intermediate step might be to thereafter connect light bulbs
and that they alternately blink as you send a slow move command. Watch out
>to get suitable voltage ratings on the bulbs. Applying lower voltage thanrated is fine as long as you can see it glow.
>problem with them
>I would use a scope but I do not know if it is available.
>
>Resistors typically fail open and I would not expect that you have a
>of the mossfets, ( I was given IRFZ 34N as a direct replacement for the
>Bertho Boman
>=================================
>
>> "Peter Smith" <peter@...> wrote:
>>
>> Dan
>> I have resoldered all the sockets, replaced all the 4700 caps, and some
IRFZ34 I assume these to be OK, or not ? ).
>> I am running all axis at 1amp (no heatsinks fitted) with a 2 1/2volt 41/2 amp test motor, I have changed the ICs from axis to axis with no
difference in performance, so assume all of these to be OK, or all U/S
>>while the 2 Z34s remain cold, (running at 1amp), the 9Z34s and Z34s on
>> Z axis
>> On the B b side of the axis, the 2 9Z34s get hot very quickly,
the A a side of the axis remain cold, (see later comment on 13FR100
Resistors)
>>motor slowly you can feel the current, you cannot feel this on the 9Z34s of
>> If you hold the bases of the 2 9Z34s on B b side when running the
side A a .
>> and the motor is erratic and sounds rough.in the above. Motor erratic and rough
>>
>> X axis
>>
>> All 9Z34s get hot very quickly, and you can feel the current off them as
>>while ?
>> Y axis
>>
>> Still nothing running at all, but the PBL 3776 gets warm after a
>>the 200 ohm scale, which is the same as joining the two probes together ie.
>> I have tested all the OHMITE resistors, I have 5 which read 0.5 ohm on
no resistance, on the other one I cannot get a reading.
>>the cold side of the axis, could it be that I have 5 reistors u/s ?
>> Refering back to the Z axis
>> The Ohmite resistor on which I cannot get a reading is on side A a
>>NON INDUCTIVE AND MARKED AS FOLLOWS
>> I have tried to get these or equivilant resistors here but no luck yet.
>>
>> IF ANYONE IN ENGLAND KNOWS OF A SUPPLIER, THE RESISTORS ARE 3 WATT
>>discussion of shop built systems in the above catagories.
>> OHMITE
>> 13FR100
>> 0.10 OHM 1%
>>
>> Best Wishes
>> Peter Smith
>>
>
>
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Discussion Thread
Peter Smith
1999-09-19 09:44:09 UTC
Progress
Bertho Boman
1999-09-19 10:15:13 UTC
Re: Progress
Peter Smith
1999-09-19 14:29:09 UTC
Re: Progress
Paul Corner
1999-09-19 16:25:55 UTC
Re: Progress
Jon Elson
1999-09-19 22:30:05 UTC
Re: Progress
Peter Smith
1999-09-20 06:58:27 UTC
Progress
Bertho Boman
1999-09-20 07:27:44 UTC
Re: Progress
Peter Smith
1999-09-20 13:30:09 UTC
Re: Progress
Paul Corner
1999-09-20 15:15:51 UTC
Re: Progress
Peter Smith
1999-09-26 07:17:50 UTC
Progress
Paul Corner
1999-09-27 12:58:36 UTC
Re: Progress
Peter Smith
1999-09-28 11:43:05 UTC
Re: Progress