On Thu, 14 Dec 2006, ali sayed wrote:
> Date: Thu, 14 Dec 2006 19:13:31 -0800 (PST)
> From: ali sayed <[EMAIL PROTECTED]>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <[email protected]>
> To: [email protected]
> Subject: [Emc-users] Help with Mesa 5i20 Card (Configuration Issues)
>
> Hi All -
>
> I was wondering if someone can help point me in the
> right direction.
>
> I have been using EMC with steppers and homemade
> driver boards for sometime now and things were working
> so so (not enogh motor power for CNC milling)
>
> I decided to convert to a servo setup and its been
> tough...
>
> I have a Mesa Electronis M5i20 board connected to a
> 7i30 board (Mesa)
>
> "The 7I30 is a 3A, 36V 4 channel H-bridge motor driver
> for the 4I27, 4I34, 4I65, 5I20 and 7I60 motion
> controllers."
>
> These are connected to DC Brush motors and a 12V 7A
> power supply.
>
> Here's where I need assistance... I have the encoders
> working but no power to the motors, jogging causes
> following errors no matter what jog rate I use.
>
> I have tried various inputs to the follwing variables
> but I can't drive the motors:
>
> MAX_OUTPUT = 10
> DEADBAND = 0.000015 - .002
> P = 150
> I = 100
> D = 0.15
>
> I have a Mesa Diagnostics board connected to the setup
> and when I jog the X-axis the LED for DAC-00-ouput
> (pin-15, IO7) comes on for a brief moment and then I
> get a following error.
>
> No matter what I set MAX_OUTPUT to halscope only shows
> a signal of 1v/div.
>
> Thanks in advance.
>
> -ali
>
Possible problems and things to check:
12V is pretty low for the 7I30, its driver chips will shut off at around 10V
to protect themselves since they will not have enough MOSFET gate drive at
that point.
Are the enable pins low? For output drive with the 7I30, you need 3 things:
1. Adequate motor power
2. Enable pins LOW (ENA0=IO11,ENA1=IO10,ENA2=IO23,ENA3=IO22)
LOW means LED on 7I31 is out
3. PWM signal ( and enough to detect with motor, probably > 10%)
Another possibility is that you have the motor or encoder lines reversed and
EMC shuts down due to the (expected) following error. I dont know enough about
EMC to know if this is the case.
>
>
>
>
>
>
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Peter Wallace
Mesa Electronics
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