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Author Topic: Stepper Driver Playing Up  (Read 6428 times)

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Stepper Driver Playing Up
« on: February 11, 2010, 12:40:01 PM »
Hi
I am just finishing off modifying my lathe for Mach3 based CNC.
Although it runs, the Z motor runs fine in one direction when I reverse the direction it slows and nearly stalls then runs fine. Each jog in that direction is fine.
When I reverse direction again it stalls then runs fine.
I swapped the motors and they are both fine the fault follows the stepper driver.
Any clues please

Clive
Re: Stepper Driver Playing Up
« Reply #1 on: February 11, 2010, 12:41:28 PM »
Can you swap a driver ?

Phil
The Good Thing About Mach3, Is It's very Configurable

The Bad Thing About Mach3, Is It's Too Configurable
Re: Stepper Driver Playing Up
« Reply #2 on: February 11, 2010, 12:44:26 PM »
Hi
I dont have another driver that size.
Its a Motion Control Products MSD325 they are quite small.
Re: Stepper Driver Playing Up
« Reply #3 on: February 11, 2010, 12:54:17 PM »
The only thing i can think of to try is make sure in the motors section of ports and pins that Dir LowActive & Step Low Active are all unticked.

Motor reverse is best done in Config, Homing limits

Phil
The Good Thing About Mach3, Is It's very Configurable

The Bad Thing About Mach3, Is It's Too Configurable
Re: Stepper Driver Playing Up
« Reply #4 on: February 11, 2010, 01:03:59 PM »
I must admit I havent looked at the config lately as it all worked.
Its almost like it runs out of power in the other direction.
I initally thought the motor was underpowered.

Clive
Re: Stepper Driver Playing Up
« Reply #5 on: February 11, 2010, 01:09:17 PM »
Clive they work best when the power supply is up to 25 times the motors rated voltage.

What is your rated voltage ?

I would take off the motor and turn the screw by hand so you can feel if one way is stiffer over the other.

Phil
The Good Thing About Mach3, Is It's very Configurable

The Bad Thing About Mach3, Is It's Too Configurable
Re: Stepper Driver Playing Up
« Reply #6 on: February 11, 2010, 01:14:38 PM »
It does with the motor on the bench.
Its definately the stepper driver because when I swap motors it does it on the other motor.
Re: Stepper Driver Playing Up
« Reply #7 on: February 11, 2010, 01:19:42 PM »
Clive sorry, you already said that.

Have you checked the config ?

Phil
The Good Thing About Mach3, Is It's very Configurable

The Bad Thing About Mach3, Is It's Too Configurable
Re: Stepper Driver Playing Up
« Reply #8 on: February 11, 2010, 01:44:08 PM »
I think I will have another bash tomorrow or the weekend I dont fancy trudging through the snow again tonight.

Clive
Re: Stepper Driver Playing Up
« Reply #9 on: February 13, 2010, 07:01:22 AM »
Stiill having problems
1. Have checked the config
2. Have tried sherline
3. Have buzzed out all wires
4. Removed 5v ground
5. swapped motors
6. Moved wires on breakout board from 4 and 5 to 6 and 7
7. Swapped stepper driver - this was interesting both stepper drivers work in the X axis both drivers didnt work in the Z axis
Have now run out of ideas

Clive