[mr jones]

Ok, I have finished the mechanical on my mill.....my mill is a 3 axis 48"X20"X5" (X, Y, and Z respectively) which utilizes 2 2.5v unipolar steppers wired in parallel for the X, 1 4.5v. unipolar for the Y, and 1 24 volt unipolar for the Z.

All parts were taken from 2 full size office copiers and has taken me 2 months to complete the mechanical.....I saved every circuit board, wire, connector, motor, electronic component and every other useful thing I thought might come in handy one day----among those useful things there exist 3 different motor driver chips that have been the focus of my work for 2 weeks now. I am no closer today to figuring out how to configure these chips than I was when I started.

the chips are........

http://www.ortodoxism.ro/datasheets/...TK6713BMK4.pdf

http://www.allegromicro.com/en/Produ...7024/97024.pdf

www.ortodoxism.ro/datasheets/toshiba/3945.pdf

I have several of the aforementioned chips (3-5 of each).

If anyone has any experience with any of these motor controls or can offer a relatively cheap (like under $50) alternative I am all ears.

But these motor drivers are whoopin on my butt......paddling it HARD!!

Any ideas?

[bezel6]

Hello,
First post.. Woohoo..
I am also interested in any help anyone has in using STK6712BMK4...
I started working on the electronics of a CNC while collecting bits for the machine. I made a 4 axis BOB and 3 discreet controllers and tested everything ok on some small steppers out of inkjet printers. I was not happy with the amount of heat coming from the resistors so when I got hold of a large photocopier that I stripped and found some bigger steppers that I could use i downloaded the datasheets for the drivers STK6712BMK4 and had plans of using these on my CNC system as they were choppers.
Months of searching the internet later I am no closer.. If anyone has any suggestions regarding hooking up this driver to my BOB or printer port I would be very greatful...
I do not mind blowing up 1 or 2 if necessary to try and get them going as I have quite a few at my disposal.
I love this site have been reading stuff off and on for months...
Catch ya..
David..

[kreutz]

Hello,
First post.. Woohoo..
I am also interested in any help anyone has in using STK6712BMK4...
I started working on the electronics of a CNC while collecting bits for the machine. I made a 4 axis BOB and 3 discreet controllers and tested everything ok on some small steppers out of inkjet printers. I was not happy with the amount of heat coming from the resistors so when I got hold of a large photocopier that I stripped and found some bigger steppers that I could use i downloaded the datasheets for the drivers STK6712BMK4 and had plans of using these on my CNC system as they were choppers.
Months of searching the internet later I am no closer.. If anyone has any suggestions regarding hooking up this driver to my BOB or printer port I would be very greatful...
I do not mind blowing up 1 or 2 if necessary to try and get them going as I have quite a few at my disposal.
I love this site have been reading stuff off and on for months...
Catch ya..
David..

I just read the datasheets for that component, you can use an L297 as a translator to drive it (in Full and Half Step), (don't use the L297 chopper), I don't offer myself to design the circuit because I am overloaded now.

[Dazza]

Hi,
I also have a few STK6712BMK4, I think I can manage to couple it up with a microcontroller probably a PIC16F628, I'll post the complete project when finished, it will be full step at first then I'll work on making it half step later on, it will probably take quite a while for me to finish this project, (I don't have a lot of spare time at present). My knowledge in electronics is fairly poor but I don't think this one is beyond me.

Darren.

[Dazza]

Hi,
I also have a few STK6712BMK4, I think I can manage to couple it up with a microcontroller probably a PIC16F628, I'll post the complete project when finished, it will be full step at first then I'll work on making it half step later on, it will probably take quite a while for me to finish this project, (I don't have a lot of spare time at present) my knowledge in electronics is fairly poor but I don't think this one is beyond me.

[AbSat]

I did a short test with the SLA7024/26 driven by a L297 and that worked.
I used the chopper from the L297 but did not perform a complete test under different load conditions. With a L297 only full and halfstep are possible.

AbSat.

[wilfrieds]

Hi there

It has been a while since you posted for help.
I know did the same thing, strip an old copy machine for CNC practice.
The datasheet for the stepper driver is of not much help.
Have you overcome this problem?

best regards
wilfried

[bezel6]

Hello wilfried,

No I am not much closer to getting this circuit working, I got sidetracked by other projects and put the CNC on hold when someone mentioned working on a PIC version.

I do not know how he has progressed.?

Like you I really want to get these things going but just don't seem to have the time lately, my sisters "new" house just needs too much work and her poor brother is usually the one to sacrefice his spare time to go do it...

Let us know if you do get something going. One day I will get back to my CNC project, I have lots of plans for it.

Take care.

David...

[wilfrieds]

Hi

PIC is not a problem, can help there.

regards
Wilfied

[Konstantin]

Hi.
I have picked up some Sanyo's STK6713BMK4 stepper drives. So far I have been experimenting with them with mixed results. The 6713 is rated at 3.0 A max (50% duty cycle (I wonder what that means)). The drive is a 4 phase, active low. I have choosen to build a little board based on the L297 to be able to utilize STEP/DIR. The problem I am experiencing is that L297 gets hot in a minute or so and the drive wont respond. It kind of wants to move the motor but it does not. I am not sure how should I wire the remaining L297 connections that are not used. I mainly need this IC to translate STEP/DIR into 4 phase output.

About the Sanyo drives, they are mounted on a pcb same width of the STK6713 and about 3/4" wide. There are very few parts on it, mainly 2 caps, a network 10k resistor (pull up I guess) and the current limiting resistors R1,R2. I have checked the values on those resistors and they do not fit in the formula provided for current limiting if one applies 5v at the Vcc2. Many of the STK6713bmk4 I got were hooked up to 1A motors.

[AbSat]

Hello Konstantin.

Can you give us the connections you made between the L297 and the STK6713?

I took a quick look and in my opinion it should work if you make the following connections between the L297 and the STK6713.
Pin 4(A) to pin 13(A), pin 6(B) to pin 15(A/), pin 7(C) to pin 14(B) and pin 9(D) to pin 16(B/).
The INH outputs of the L297 are not used.
Because you are using the chopper of the STK6713 you can connect the pins 11, 13, 14, 15, 16 of the L297 to gnd and pin 1 to VCC.
If you are not using the enable input pin 10 for control, it can be connected to VCC. With pin 19 half/fullstep mode you can switch between full and halfstep.

What values did you find for the Vref resistors?

Take good care of the powerconnections between the boards. Specialy the VCC +5V connections and the gnd. Differances between the 5V at the L297 board and the STK6713 board or bad gnd connections between these boards can damage the L297.

AbSat.

[box1sa]

Where can i ask some good technical advise about my motor and spindle control as well as software.

Change to existing system

New at this

[AbSat]

@box1sa.
I think your question is not related to this topic about the STK6713 so please open a new topic and give detailed information about your motor and the software you want advise about.

A Konstantin.

50% duty cycle means that the current is 50% of the cycle time is switched on and 50% switched off.

AbSat.

[Konstantin]

I have been making a 3 axis machine to be powered by those STK drives and I dont know if it is my ADHD kicking in or glitches in the matrix but when everything appears to be working on the proto board ( I have assembled for 3 axis) when I solder things down I get some sort of crappiness. Let me debug my setup, I have came back to the protoboard once more to test 1 axis and it is working fine. Gonna be extra crispy careful and make this one count.
Will post all info soon.

[Konstantin]

Here is my setup.


I am using 1A on Z, Y and a 3A motor on X, the X drive is current limited to 2.9 A.
For now my Z axis is not holding the motor at power up. I am not sure about why, it does jogs perfectly from Mach3 and all. Sometimes it lands on a position where is does hold and sometimes it does not. I will try to change the drive next time. Y axis holds perfectly and jogs fine.
X axis holds and jogs at the beginning but after a while it will move with jerkiness and erratically also it will "sing" very annoyingly at some positions . Don't know why, I will try another motor and another drive if not solved. It gets warm to touch but nothing suspicious.
You can see 3 pairs of L297 + 74LS04 inverter, since my drive is active low.

Currently I am using two power supplies, I join grounds together. One gives me 5.2V at 40amps and the other one is for motors 25V at 7.5 amps. I tried using 7805 in TO-22 package and it gets very hot even with heat sink, I cant find the (K) version, around here, which outputs 1.5A. Are there other voltage regulators that will output +5v at 2 or more amps and can receive up to 30V ?

Here is my documentation file I have for L297 and the STK6713BMK4

Mach 3 Dir and Step active LOW.

/***********  L297 wiring  *************/

PIN	CONN	NAME
---------------------
1 	NC	SYNC
2	GND	GND
3	NC	HOME
4	PIN_9	ON STK PCB (I wire this through an inverter 74ls04)
5	NC	INH1	
6	PIN_11	ON STK PCB (I wire this through an inverter 74ls04)
7	PIN_10	ON STK PCB (I wire this through an inverter 74ls04)
8	NC	INH2
9	PIN_12	ON STK PCB (I wire this through an inverter 74ls04)
10	+5V	ENABLE ***NC for now***
11	GND	CONTROL (10kOhm resistor to GND pulldown)
12	+5V	Vs			
13	GND	SENS2
14	GND	SENS1
15	GND	Vref	
16	NC	OSC	
17	DIR	CW/CCW	
18	STEP	CLOCK	
19	+5	HALF/FULL (HIGH IS HALF) (10kOhm resistor to +5v pullup)
20	NC	RESET

NOTES:
GND signal must be connected to GND on the BOB board to equalize ground planes. 

/************ PCB  STK 6713BMK4 PCB  *************/
J143 CONNECTOR 
------------
1	GND	
2	GND
3	GND
4	Vcc1 +18 - +42V
5	Vcc1 +18 - +42V
6	Vcc1 +18 - +42V
7	GND
8	Vcc2 +5 IOH SETTING CIRCUIT
9	PIN 13 on STK6713 A  PHASE
10	PIN 14 on STK6713 A' PHASE
11	PIN 15 on STK6713 B  PHASE
12	PIN 16 on STK6713 B' PHASE
13	Vcc2 +5


STK6713BMK4 IC Pinouts
PIN --- NAME
1	 Vcc2
2	 A phase motor output
3	'A phase motor output
4	 PG motor common
5	 SG motor common
6	 B phase motor output
7	'B phase motor output
8	 TD1 (motor hold noise reduction use cap with pin 10)
9	 Vref
10	 TD2 (motor hold noise reduction use cap with pin 8)
11	 Vref
12	 NC
13	 A phase input
14	 B phase input
15	'A phase input
16	'B phase input


CURRENT LIMITING RESISTORS
Formula is Amps = 1.3*(R2/(R1+R2))*(5.2/0.33) (5.2 is my Vref voltage [pin 8 on 

J143 connector], use your logic [+5 or watever] voltage in the formula for more 

exact results

Amps --- R1 -- R2  value in Ohms
------------------------------
0.91A - 4700 - 220
0.94A - 3300 - 160
1.07A - 1800 - 100
1.09A - 3900 - 220
1.34A - 4700 - 330
1.46A - 4300 - 330
1.59A - 3900 - 330
1.70A - 3300 - 300
1.86A - 3000 - 300
1.86A - 3900 - 390
2.01A - 3300 - 360
2.03A - 3000 - 330
2.14A - 4700 - 550
2.16A - 3300 - 390
2.18A - 3600 - 430
2.19A - 3000 - 360
2.27A - 2400 - 300
2.32A - 4300 - 550
2.35A - 3000 - 390
2.36A - 3300 - 430
2.36A - 3600 - 470
2.47A - 2400 - 330
2.54A - 3600 - 510
2.55A - 3300 - 470
2.67A - 2400 - 360
2.74A - 3300 - 510
2.75A - 3600 - 560
2.86A - 2400 - 390
2.97A - 3300 - 560

I have left enable floating and it had no effect on "enabling" the drive.

[AbSat]

@ Konstantin.

I see no problem in the wiring.
I should connect the sync in/output of the L297 to +5V to make sure that the chopper part of the L297 is disabled. For stability reasons I should connect the enable input to +5V too.
Connect a 100nF capacitor as close as possible over the +5V connections of the each L297 and use star wiring from each PCB to the power supply both for 5V and the motor voltage.
Bringing down the 5V from 25V is a big step for a 7805. The best solution is to use a switching regulator or use two steps to do it, a 7812 form 25V to 12V and a 7805 form 12V to 5V. Place on each in and output of a 78xx a 100nF capacitor and on each output a minimal 100uF capacitor. Sometimes I had problems in the system when the motor voltage appears prior to the 5V control voltage. This can give unwanted random steps of the motors. So when you use different power supply’s, switch on 5V first to let the control logic stabilize and than switch on the motor voltage.
When you use one supply, a little delay in switching the power to the motors, controlled by the 5V, could avoid some instability during power up.

AbSat.

[murray]

I did a short test with the SLA7024/26 driven by a L297 and that worked.
I used the chopper from the L297 but did not perform a complete test under different load conditions. With a L297 only full and halfstep are possible.

AbSat.

I too have 3 of these driver chips. Do you still have the schematic that you used to hook them up? They seem to be pretty common in photocopiers.

Thanks

[AbSat]

I too have 3 of these driver chips. Do you still have the schematic that you used to hook them up? They seem to be pretty common in photocopiers.

Thanks

Hello murray.

I still have, so send me a personal massage with you email adress and I will send it to you. You can have it in .sch so Eagle format or as jpeg.

AbSat.

[fur]

hello
i have 1 stk6712bmk4 and 2 l297 and i want buid the driver can u send me the schematic please?
thanks

[fur]

hello
i have one stk6712bkm4 one sla7026m and two l297 can everyone give me the schematic of driver
please
thanks