Gecko 6202 Wont step Please help

[foocat]

Hello,

I have just recieved 2 ( I ordered 3) Jan will be sending out the third directly due to a mis-shipment.

I am unable to get the drive to step at all. The drive will lock when powered on. I Built the Power supply on some recommendations from some excellent tech support at gecko. and used the recommended resister. Before i give yu the detail on my setup, let me say that due to reading almost every post here at CNCZONE on the gecko and other driveres i decided to purchase from them because of all the great reviews here. I also vowed that no matter what i would not wire these drives incorrectly. With that bieng said. I have not wired the setup any difffrently than described here.

I am doing a test with only one motor

Steppers NEMA23 BiPolar Parrellel 2.8 amps per phase 4.7 Volt
http://www.kelinginc.net/KL23H286-20-08B.pdf

Geckos 6202 E6 listed on driver (red light on) (no smoke)

Power 24 Volt regulated PS 4 amp (temp for bench testing)
(Final PS will be a 24 v 10 A Iron Transformer W Full wave bridge rectifer)
Mallory 27000 MFD 50VDC Cap (Triple red) Bleed down resistor

Computer Dell laptop 8000 series
Dos 6.22, TurboCNC 4

v+ 3.8 Volt on printer port pin 6(on)
v .1 Volt on printer port pin 6 (off)

Using Turbo CNC The drive wont step

Ground Pin 10 is connected to Laptop

will 3.8 volts drive the motor?

In addition i have 5vdc on pins +9 and -10 to see if the motor would step(no)
Would i even notice 1/2000 step with my hand on the shaft?

Can someone tell me what i am doing wrong?

Is it possable i recieved a defective driver?


I have not tested the second driver because i want to be sure im not breaking them..


Please help.

Don

[ger21]

Pin 10 is not ground. It needs 5V. That is the common pin, correct?

[foocat]

Originally Posted by ger21 Pin 10 is not ground. It needs 5V. That is the common pin, correct?

Thans for the fast response.. After applying +5vdc to pin 10 as you suggested, I can get the motor to step. The voltages have changed on pins 9 and 10.

I almost see my error, But i dont totaly understand. if the lpt port supplys TTL logic (0v) or (3.8v) Why is the driver wanting 5V on pin 10? it would seem that the driver assumes that TTL is Normally high and you ground pin 9 for a step? Is this correct?

Here is a problem

The voltages (no ocilliscope) on the pins are as follows...

Step 1.57
Step 1.63 when stepping (nice purr)
Dir 1.57 Problem (No rotation Heavy vibration)
Dir 4.79 (nice purr)

The full circut still does not make sense..

I have a inclded a simple diagram of my wiring

does anyone understand what the vibration might be?

Thanks..

[ger21]

I think the 5V powers the optoisolators

[ger21]

Where are you getting the 5V from? I don't think you want to tie the supply ground to the parallel port ground.

You can't measure the step voltage with a meter, because it's changing to fast. The direction, however, should be closer to 0, and the motor should be moving in the other direction. You may have noise on the dir. line.

Forgot to mention that to take advantage of the Geckos with those motors, you should probably use a 48V-60V power supply.

[foocat]

FYI: I recieved my last driver overnight, Way to go. Great customer service.



Ger21 :

The 5 volt is from a AT Computer Power supply.

Here is the real root of the question. If pin 10 is supposed to be +5vdc then where should the ground (-) ground for that 5v go?

and another question that is equally important is.

If pin 8 and pin 9 should have hi and lo TTL for step and direction. then where should the ground go for pin 8 and 9. I had assumed that it was common (pin 10)

Or possably it is
+5 vdc pin 10 Constant
0 vdc pin 9 normal
+5 vdc pin 9 for pulse step
0 vdc pin 8 normal
+5 vdc pin 8 reverse direction

Still this leaves the question Where does the ground for this 5v go?



Confused

Don

Thanks so much for info about the transformer, I dont have a high tourqe or veloicity application for these motors. they will run virtually no load at less than 300 rpm

[CJL5585]

Pin #10 on the Gecko gets the +5 Volts.

The common or negative 5 volts goes to pins 18 thru 25 on the parallel port and/or the breakout board.


IN TURBOCNC, or other program, each output MUST BE set to "ACTIVE LOW" on each of the output pin numbers 2,3,4,5,6,7,8,9 in order to use an external 5 VDC supply.

*********************************************************
The accepted wiring configuration of the axis:

X axis pins 2 and 3 for step and direction
Y axis pins 4 and 5 " "
Z axis pins 6 and 7 " "
*********************************************************

VERY, VERY SIMPLIFIED EXPLANATION FOR CURRENT PATH:

If the output is set to ACTIVE LOW:

Current flows from the 5 volt negative or common, (One of the ground pins 18 thru 25 associated with the parallel port or breakout board) thru the control element on the printer card and out thru the selected pin number (In this case pins 2 thru 9 on the parallel port and/or breakout board which are wired to the selected input (step or direction) on the Gecko drive.

The current then flows from the input pin on the Gecko drive to the negative side of a light source to the positive side of the light source which are inside the optocoupler, thru a current limit resistor to the +5 Volts applied to pin 10 of the Gecko drive. This completes a circuit, and something should happen.

********************************************************
If the output is set to ACTIVE HIGH: OR a signal is not being sent.

There is +5 volts at the negative side of the light source from the parallel port/breakout board, and also +5 volts on the positive side of the light source (inside the optocoupler) from pin 10 on the Gecko, so effectively there is not a current path, so nothing happens.

Jerry

[foocat]

I got it working properly.

You need 5vdc on pin 10. From the usb port to fire the OPTI. The problem is not obvious. You need an xtra wire from the main controler if you are using a pc for the controller. I am using a LPT Cable and i was not expecting to have to run a another cable for power. Afer hacking the end of a USB. Red wire in my case was +5vdc. this red wire is tied to pin 10 on the gecko. There is another post where Mariss is explaining to use a game port pin one for 5 volts. My first thought was to use a midi (old style joystick) Then i realized he must be describing a USB.

Anyway thanks for the assistance.


CNCZONE is a great place to learn and meet some really intelegent people.

Don