EGIS motor

[MrDish1]

This is how I travelled with the Egis Rotor on my way to South France .
No room inside the car by all the dresses and shoes from my lovely wife .
Delivered to a friend of JP in Valence and yesterday picked it up from JP at a spot near Macon .
Had a (too)short chat with JP , nice to meet him .

View attachment 145026

Well women.
always too much of one and the other

 

[dreambox1959]

hello
i have to buy some components to build my EGIS positioner.
i want to know who and how many guys want one .
contact me PM

 

[Captain Jack]

Had a (too)short chat with JP , nice to meet him .

Always good to see members of the forum meeting up in person! Internationally even!

Interesting thing.
During yesterday, many interested people downloaded the original documentation for the EGIS positioner from my website. I don't know if this is related, but my website is down today. It seems that hackers have become interested in them. I just want to let you know that my website is currently down. I am aware of this and will restore from backup. But there is a possibility that the situation will repeat itself. We'll see.

You have an interesting site! I enjoyed browsing through it.

 

[Hugocz]

So I finished writing articles about HW version 2.1. You can download the schematic in Eagle 8.2.0 format. I would appreciate it if someone could make a PCB design of it. I'm not doing well yet. The result is still too complex.

 

[dreambox1959]

here is the global schematic of EGIS adapter to my positioner .

 

[Hugocz]

Interestingly. You have it differently than me.

1) Input pulses from egis sensors:
If the sensor output is 0V, the diode in the optocoupler lights up. That is right.
But if the output from the sensor is 24V, only the 1N4148 diode prevents the opposite polarity from connecting to the optocoupler. Is she fast enough? Won't short pulses of 19V (24V - 5V) be received up to the optocoupler? Isn't it a risk of damaging the optocoupler? I think the resistor network that is in the original EPS-103 wiring and that I used is safer.

2) Not using B pulses reduces the physical resolution of the position. I don't know if it is already below the resolution of the EGIS mechanical design. Perhaps the dead run of the mechanical parts is greater than the accuracy of the additional pulses. But EGIS uses them for a reason. Would using them be an unnecessary complication for you?

3) Use of NAND Schmitt trigger is correct for origin switches. But for AZ / EL impulses, they are perhaps redundant. But there are four in the HEF4093B circuit. I understand their use. The Raspberry Pi has this feature on its GPIOs. It can be activated by software. That's why I didn't use an external circuit.

4) Does the L7805 stabilizer not heat up? Converting from 24V to 5V is quite a leap. Can't 5V be output from the positioner? :-)

I hope you don't take my comments as slander of a competitor. Discussion is important. If only someone could break down my schematic. I would definitely learn a lot.

 

[suedschwede]

4) Does the L7805 stabilizer not heat up? Converting from 24V to 5V is quite a leap. Can't 5V be output from the positioner? :-)

Reducing 24V to 5V using a 7805 is already daring, about 16-17V are destroyed and converted into heat. For the few milliamps of current that the 4093 and the rest needs, that will be fine, but when the polar rotor servo goes into operation, which draws 1-2A peak current, the 7805 will be in trouble.

 

[dreambox1959]

1-the pulses that come from the EGIS engine through an ULN2001 (open collector) the amplitude is not 24V, it depends on the + pull-up resistor, I checked it in real. the current flowing through the opto is limited by R470ohm and diode 1n4148 (10mA).
2- in my first test I had kept the two pulses (A and and obtained more pulses, but counting only the high state we have 18000 pulses for 180°, if we count high and low state 36000 pulses for 180 ° and with a mix of two pulses (A and 72000 pulses for 180°.
In the EGIS documentation it is written that there are 100 pulses per degree. It's too much, the definition is far superior to the mechanical game.
3- nothing to say!!
4-it is not a classic 7805 but a compatible module but switching mode, no heating, 95% efficiency.

for information i add schematic of my first test , good for a incremental encoder like omron E6B2-CWZ6C. but not useful for egis .
I like your project, I am more comfortable with assembly language programming.

7805 clone :

1.31￡ |Module De Régulateur De Tension, Convertisseur Abaisseur, Dc 5v 6v 9v 12v 24v À Dc 3.3v 5v, Dd4012sa 1a - Onduleurs Et Convertisseurs - AliExpress

Achetez malin, vivez mieux! Aliexpress.com

fr.aliexpress.com

Régulateur de commutation RS PRO, entrée 8 → 36V c.c., sortie 5V c.c., 2A | RS

fr.rs-online.com

 

[Hugocz]

The Operation Manual EPS-103.pdf document on my website was originally just scanned. I rewrote the texts so that Google could translate them into other languages and cleaned up the remaining images. I recommend everyone who has already downloaded this manual to do it again.

 

[dreambox1959]

I thought that putting an interface card at the foot of the Egis engine was not a very good solution and then
HUGOCZ made me notice that the pulses could be in 24v, so I redesigned a printed circuit where the 24V to 5V interface would be in the positioner.
Between the EGIS and the positioner there will be only cable (a slightly modified wiring).
for those who need a polarotor, and it seems obvious, the 5V will be obtained by a 24v>5v switching module.
The card will be available in 15 days.

 

[dreambox1959]

as I don't have an egis engine, I made a simulator: with a small motor that runs very quickly (8000/m in 12v). followed by a gearbox which divides by 260. I reduced the 12V so that the pulses are 1ms (a little less than the real egis) in the video I activated the stop a little before the end point which allows you to stop in just the right place..

 

[dreambox1959]

Hugocz or FEMi
can you take a look on your egis motor
i would like to know the speed of azimut motor :
when i had the trust s motor i saw a pulse every 1.3ms with load .
1.19ms with no load ,theorical speed is 1.6ms.
give me either time for 180° or if you have an oscilloscope real timing
thanks

 

[Hugocz]

I currently have EGIS down. I was editing the software and there was an error. I'm trying to find her.
I have an interesting knowledge.
The azimuth motor was left running unchecked during the westward turn. After the mechanical blocking of the EGIS mechanism, the 24V source remained short-circuited. Something in the sensors of the EPR-203 unit is causing this short. After disconnecting the 24V for the sensors, the power source started up and it was possible to drive away with the engine from the blocked position towards the east. After reconnecting the 24V for the sensors, everything works correctly. It is therefore necessary that the 24V source has short-circuit protection. Otherwise the fuses will blow. It would definitely be useful to add limit switches.

 

[dreambox1959]

it is true that there is only one switch per axis. it would be quite easy to add a second one for the azimuth.
on the other hand it is the info coming from the switch which allows the microprocessor to stop the motor, it would be necessary to wire as in a classic jack (diode on the switch).
in my software I monitor the arrival of pulses, when there are none for 25ms I cut the power supply.

 

[Hugocz]

Pulse tracking does not work when a bug in the program causes the computer to freeze.
My program is written in Python. Python does not check the correctness of the entire program. Only when it encounters an error while running does it stop and write a message. This happened to me and the engine stayed on. I'm not friends with Python.

 

[Hugocz]

I did a spin speed test. EGIS + Laminas 2700 dish.
Initial position 85.0°E, target position 30°W
Number of pulses 25618 (PhaseA + PhaseB )
Rotation time 32 s.

 

[dreambox1959]

thanks Hugocz
with calculation i get :
25618 p in 32 s = about 800 pulses/sec = 48000 pulses/min = 4000t/min = pulses duration = 1.25ms .
good for me.

 

[7mdish]

Dreambox1959, I need for a friend.
He has an Egis unit in his setup, but he is so annoying not to be able to control his motor from a modern receiver.
Also, his setup includes the good old C/Ku band Corotor feed by Chaparral, and uses an old receiver to change polarity.
His goal would be to control everything automatically from his Vu+ receiver.
Do you think it is possible with your positioner?
If so, could you please explain better how to connect all 14 wires from Egis and which modifications are needed?
Eventually what is the actual price for a built and ready-to-use unit? Thanks.

 

[dreambox1959]

yes my new version of my positioner (very slightly different from the model for cylinder or classic motor) will meet all these wishes:
-azimuth and elevation control.
-control of a corotor-style mechanical polarotor.
-240 places - control of the LNB changer type TRUST.
-command by serial port remote control keyboard, update by USB port.
- management of Diseqc commands coming from the receiver.
the big difference with the EGIS motor is that it works at 24V, the sensors too, there are 36000 pulses for 180° whereas on the cylinders it is rather 4000!!
there is only one switch per axis which serves as a reference, I kept this function but it is not mandatory there is no loss of positions in the event of a power cut.

 

[dreambox1959]

the starting and stopping of the motors is done smoothly thanks to a PWM circuit that goes from 20% to 100%.
It will be necessary to ensure that 20% is not too low for the EGIS.
for the polarizer with servomotor, the 5V power supply will be obtained from the permanent 24V present for the encoders.
I redesigned the output interface of my positioner so that everything is in the posi and the controls are in 24V , it will be compatible with the original controller, only wires between the positioner and the motor.