Sending the ASC1 into retirement?AJAK

[Titanium]

Well, a quick update...

Magic Static went over to Pdiddy's place today to apply Ponny's fix and the 3 capacitor fix on the motor feed. His USB/Serial converter had no love on Pdiddy's computer, so he left his personal ASC1 with 20140702v1 firmware version already installed and another simple suggestion that I had made to twist the M1/M2 leads connecting the rear panel strip to Con102 on the PCB and run the twisted pair perpendicular to the other wires.

Initial testing shows no positioning errors, but they will have Pdiddy exercise it hard for a few weeks before the thumbs-up/down. Which mod, firmware, filter or combination made the difference and has it fixed the issues... remains to be determined.

 

[Ponny]

Hello,

who wants to test a Smittriger for the ASC to 1 meter. In the annex of the schematic. The design has been tested.

Ponny

 

[Ponny]

Hello,

who wants to test a Smittriger for the ASC to 1 meter. In the annex of the schematic. The design has been tested.

Ponny

 

[Magic Static]

?? IC1 Brand name? part number?

 

[KE4EST]

Look at the schematic again Fred. 4093N

 

[Magic Static]

Look at the schematic again Fred. 4093N

Thanks, I saw the number and could not get a hit on it. I found some similar scmitt trigger inverters, but wasn't sure what I was looking for.

 

[KE4EST]

Yep best I can figure(was doing a little reading) this has been replaced with the 4000B series. So 4093B or similar. For sure though do your on research before you order one. I don't have time right now to read to deep into it and study the circuit.

 

[Ponny]

Hello,

I have done many tests with the counter of the ASC 1. With the Schmitt trigger or Reed Relays. The pulses are clean without interference at the counting input. After about 3 to 4 times driving a Satposition, he has too much counted up to 10 pulses. Here, a software or hardware error exists in the device. In the photo you see the clean signal without any errors.

Ponny

 

[Magic Static]

Hello,

who wants to test a Smittriger for the ASC to 1 meter. In the annex of the schematic. The design has been tested.

Ponny

Is T1 BC548 not BC458?
Is R2 the only resistor? no R1?

 

[Titanium]

I use a cycle counter to measure point A to point B movement of 250 counts. Record the count, clear the counter, return B to A and record the count. Repeat.... I perform this test with 100 repetitions without count error.

What is the difference in the system testing that we have perfect counts with 100+ point A to point B passes, but you are having 10 count error after 3 or 4 repetitions? Is the count error always short or long for landing on the programmed position?

 

[Trust]

To drive a Ajak with Usals I replaced the reed-switch for a pulswheel with 48 slots (necessary to provide 40 pulses / degree polaraxis rotation) and a slotted optical IR switch .
I wonder , could such pulser be the solution for the problem with Ajak ?

 

[FTA4PA]

To drive a Ajak with Usals I replaced the reed-switch for a pulswheel with 48 slots (necessary to provide 40 pulses / degree polaraxis rotation) and a slotted optical IR switch .
I wonder , could such pulser be the solution for the problem with Ajak ?View attachment 100320View attachment 100321View attachment 100322View attachment 100323

Very nice modification! Can you provide any detailed info on the parts you used for this mod, schematic for pulse circuit, etc?

 

[Trust]

I posted it here some time ago :
http://www.satelliteguys.us/xen/threads/usals-modification-for-h2h-motors.334390/#post-3418998

 

[FTA4PA]

I posted it here some time ago :
http://www.satelliteguys.us/xen/threads/usals-modification-for-h2h-motors.334390/#post-3418998

Thanks for the link. Been wondering if this was possible.

 

[Ponny]

Hi,

after many tests I was investigating probably the cause of the incorrect counting of pulses. Look at these pictures in the annex you the oscilloscope. During the starting and stopping of the motor voltage is regulated. In the the interference caused the period of the scheme. The single step, the voltage is not regulated, but is maximum. These counts are without errors. You can see this on the screen step. You would have to test a software in which this rule does not exist. The V-box II or G-box also controls not the voltage at the start or stop. Still not counting errors occur.

Ponny

 

[pdiddy]

Thanks for the post Ponny,what do you think Brian?

 

[Titanium]

I have been communicating with Ponny about this matter and he had provided this data earlier on the week. For those that don't know, Ponny is a Titanium Satellite reseller in Germany. We are providing him test firmware next week with no ramping (power regulation). Since the issues cannot be replicated on our equipment, Ponny has been testing various firmware with his system. He is passing this information to update other members with our emails.

The firmware since 20140401v1 received sensor counts after motor voltage termination for a few seconds and works with our bench motors and Ponny's low current draw motors. Ponny pointed out in an email that this voltage regulation testing was noted on high current draw motors, but not with low current draw units. The highest current draw motor on my bench is 2.5 amps and Ponny is testing with 4 amp draw. This could be the difference in our bench testing.