On 12 February 2013 02:36, Pete Matos petefro...@gmail.com wrote:
I want to end up with an estop circuit that will kill power to
everything in the machine except the computer in case of an emergency
On my machine I have taken the PC/controller/24V power from upstream
of the main contactor.
On Mon, Feb 11, 2013 at 12:45 PM, Gene Heskett ghesk...@wdtv.com wrote:
I was just about to say that, but Gene beat me to it. Had an
interesting discussion on the Tektronix listserv last week about
exactly the same thing. The shorter the ground lead, the better. If
you have a ground next
Andy,
Interesting info man. Actually that is kinda what I was planning to do
with the computer power but the 24volt power supply had not occurred to me
to do that way. When you say contractors I wonder if you mean the same
things as I do. Basically my machine has a huge rotary switch with a
On 12 February 2013 13:06, Pete Matos petefro...@gmail.com wrote:
Basically my machine has a huge rotary switch with a big
lever that was originally used to switcg power to the machine on and off.
I think that should stay, and kill absolutely everything. (I have such
a switch on my machine).
On 12 February 2013 13:35, andy pugh bodge...@gmail.com wrote:
http://uk.rs-online.com/web/p/contactors/7434908/
Just checking, and the 24V coil in those contactors is rated 3W, or
125mA. The Field outputs on the 7i77 are rated for 24V and 350mA, so
you should be able to wire 24V to field-power
Thanks for the info...can you explain that last part 7i77 GPIO? I have
just started looking at this stuff and I am not entirely clear on the mesa
side of things just yet. As far as I know I should not need any delay in
the power supply setup and it sounds like that last bit in your post should
On 12 February 2013 14:53, Pete Matos petefro...@gmail.com wrote:
Thanks for the info...can you explain that last part 7i77 GPIO?
The 7i77 has 32 inputs and 16 outputs for general-purpose IO. (on TB7
and TB8 I think).
Did I hear you correctly when you said you wired your limits and
homes in
I am not always a fan of just killing the power to every thing on an e-stop.
On our high speed routers if you just kill power to the spindle, they can coast
for hours. It takes quite a while to stop from 18K rpm with out any DC
braking. So I have the e-stop triggering the external fault
On 12 February 2013 15:08, Todd Zuercher
zuerc...@embarqmail.com wrote:
I have the e-stop triggering the external fault circuit on the spindle
inverters instead of just cutting power to them.
That probably makes sense in all emergencies other than a
spindle-inverter fire
On Tue, Feb 12, 2013 at 10:08 AM, Todd Zuercher zuerc...@embarqmail.comwrote:
I am not always a fan of just killing the power to every thing on an
e-stop. On our high speed routers if you just kill power to the spindle,
they can coast for hours. It takes quite a while to stop from 18K rpm
Right.. the safety regs say that you can do what you need to bring the
machine to safe stop, but in the end the power has to be dumped to the
drives or they need to go into a
STO condition - Safe Torque Off mode.
The big thing is that the safety controls are suppose to override the
normal
Well that may work fine for you and honestly I love soft limits as much as
the next Guy but I honestly prefer to have the drives enabled in a limit
switch trip situation so I can just backoff,backup and punt my way back
into the program. It worked fine that way on my RF45. If I have my way I
Also I'd like to hear opinions from you guys as to the idea of using limits
in a serial fashion on a single pin to the IO board. My last machine had
optical limits and while they were super nice and accurate they were kinda
prone to noise issues and wiring them up was a beotch... I know that was
Well this is how all of the big comercially built routers I have worked with
have been set up, I figured if it is good enough for the big boys it should
work for me.
As to the electrical fire in the inverter, (or anywhere else for that matter)
that why you also have a main disconnect to cut
Just one more scenario for fun.
The A and B axes hard limits on the cinci are wired to shut off the drive
when tripped. When an A or B hard limit is tripped and the drive is shut
off the head is tilted so far the weight causes the head to keep moving and
the pinion gear will drop off the end of
Actually my machine WILL have and did have a large disconnect switch to
depower the entire machine. Only problem is that it is in the way back
behind the machine and when the drive blew by the time I realized what the
hell just happened and slapped the estop button AND ran around the back of
the
Ok - I will say a couple more things and then shut up about it. :)
- On conventional machines (not robot arms or such) the linuxcnc soft
limits are rock solid. After the machine is homed - they work 100%.
(again - I have never hit the limit switch when the machine was homed)
If you may be
On Tue, 2013-02-12 at 10:16 -0600, Stuart Stevenson wrote:
Just one more scenario for fun.
The A and B axes hard limits on the cinci are wired to shut off the drive
when tripped. When an A or B hard limit is tripped and the drive is shut
off the head is tilted so far the weight causes the head
On Tue, 12 Feb 2013, dave wrote:
Date: Tue, 12 Feb 2013 08:40:16 -0800
From: dave dengv...@charter.net
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Cincinnati Arrow 500 retrofit...
On Tue, 2013-02-12 at 10:16 -0600, Stuart Stevenson wrote:
Sam,
okay now we are getting somewhere, you bring up a valid point here. I
have been in that situation before with a runaway servo and buddy it is no
fun. I can see what you mean about getting the drive depowered in the event
of a runaway. I guess I was more thinking about a limit trip during
On 12 February 2013 16:40, dave dengv...@charter.net wrote:
On Tue, 2013-02-12 at 10:16 -0600, Stuart Stevenson wrote:
When an A or B hard limit is tripped and the drive is shut
off the head is tilted so far the weight causes the head to keep moving and
the pinion gear will drop off the end
Okay another point I am missing, if you have your limits tied into the
estop to depower the entire system how the hell do you home the machine?
Do you have seperate home switches. I intend to use to the limits as homes
for the purposes of homing the machine.
On Tue, Feb 12, 2013 at 11:44 AM,
On 2/12/2013 10:44 AM, Pete Matos wrote:
Sam,
okay now we are getting somewhere, you bring up a valid point here. I
have been in that situation before with a runaway servo and buddy it is no
fun. I can see what you mean about getting the drive depowered in the event
of a runaway. I
Have you checked to see what the machine has for limits/home switches?
You may have all you need. If you try to use them for both - then I
think you again putting the machine in a mode where you are not
protected. (again - not a hobby machine :) )
(in my opinion the limit switches should
On Tue, Feb 12, 2013, at 11:44 AM, Pete Matos wrote:
Sam,
okay now we are getting somewhere, you bring up a valid point here. I
have been in that situation before with a runaway servo and buddy it is no
fun. I can see what you mean about getting the drive depowered in the event
of a
John,
That is about the clearest most logical response I could have asked
for. Quite honestly I am unsure if my machine has three switches per axis
as you described. I will have to check. It is definitely a PRO CLASS
commercial machine as you say but I am unaware of the actual limit design
On Tue, Feb 12, 2013 at 02:34:20PM -0500, Pete Matos wrote:
John,
That is about the clearest most logical response I could have asked
for. Quite honestly I am unsure if my machine has three switches per axis
as you described. I will have to check. It is definitely a PRO CLASS
commercial
our big machine has 1 limit and 1 home machine for each axis - but a
cam on each end of travel. (so 1 switch is used for both ends of travel)
(actually what I am using for the home switch was actually the tool
change location switches)
sam
On 2/12/2013 1:45 PM, Chris Radek wrote:
On Tue,
Chris,
Can you elaborate some more on index homing and also on your
machines little switch. How is it wired? Perhaps that is my solution
should the machine not have a homing switch. I just got off the phone with
Dave from machmotion and apparently the drives have multiple inputs for
power.
On Tue, Feb 12, 2013 at 2:59 PM, sam sokolik sa...@empirescreen.com wrote:
our big machine has 1 limit and 1 home machine for each axis - but a
cam on each end of travel. (so 1 switch is used for both ends of travel)
my mill has a single limit switch for x and y so you can't tell which
On Tue, Feb 12, 2013 at 10:57 AM, Dave e...@dc9.tzo.com wrote:
I have a large CNC lathe that has contactors wired in between the servo
drives and the motors and on an Estop, the contactors drop out and the 3
phase servo motor windings are shorted together to stop the motors.
I thought this is
On Tue, 2013-02-12 at 13:59 -0600, sam sokolik wrote:
our big machine has 1 limit and 1 home machine for each axis - but a
cam on each end of travel. (so 1 switch is used for both ends of travel)
Nice idea ... why didn't I think of that? ;-) It does take a different
arrangement of switches
I don't understand the advantage of having the limit switch in the e-stop chain.
Why not just use the normal limit switch route through the control?
Linuxcnc didables the drive by removing the drive enable signal when a limit
switch is tripped.
- Original Message -
On Tue, Feb 12,
On 12 February 2013 21:56, Todd Zuercher
zuerc...@embarqmail.com wrote:
Why not just use the normal limit switch route through the control?
Linuxcnc didables the drive by removing the drive enable signal when a limit
switch is tripped.
What if the runaway is due to
Okay guys, as of today my brand new motors and drives are ordered and on
their way to me. I am pretty excited about this as I will be basically
working with all brand new components on my VMC here and I get to choose
how they are wired and run. YEAY
In regard to the limit and estop ciruit
On Tuesday 12 February 2013 22:36:22 Przemek Klosowski did opine:
On Tue, Feb 12, 2013 at 10:57 AM, Dave e...@dc9.tzo.com wrote:
I have a large CNC lathe that has contactors wired in between the
servo drives and the motors and on an Estop, the contactors drop out
and the 3 phase servo
Interesting so using a relay to depower the vfd is bad junior then...using
the controls computer estop and the mesa to shutdown the drive is a better
option then.that's good I was just looking at having to buy a larger
relay for the spindle drive. Any input on the best way to accomplish this?
I think what Gene is saying is that a relay or contactor between the VFD
and the motor is bad (likely to damage the VFD). The proper way for an
E-stop condition to remove power from the motor is by switching off the
power leading into the VFD. As you mentioned, your Teco VFDs have two
power
Pete,
Usually on larger, stronger machines, the limits are not used as home
switches, since the limits are the OMG last ditch effort to keep you
from breaking expensive parts.
You really want to wire your limits into the Estop system.
One possible Estop control scenario: You push a button
On 2/12/2013 10:47 PM, Gene Heskett wrote:
On Tuesday 12 February 2013 22:36:22 Przemek Klosowski did opine:
On Tue, Feb 12, 2013 at 10:57 AM, Davee...@dc9.tzo.com wrote:
I have a large CNC lathe that has contactors wired in between the
servo drives and the motors and on an
On Wednesday 13 February 2013 00:00:37 Dave did opine:
On 2/12/2013 10:47 PM, Gene Heskett wrote:
On Tuesday 12 February 2013 22:36:22 Przemek Klosowski did opine:
On Tue, Feb 12, 2013 at 10:57 AM, Davee...@dc9.tzo.com wrote:
I have a large CNC lathe that has contactors wired in between
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