Post by Gunner AschOn Mon, 05 Jan 2015 20:18:02 +0000, jeffie_3
Post by jeffie_3I have an omni-turn GT75. It has been running great. Then it gave me an x
axis servo error. I reset it and now it will not zero in the x-axis. Any
idea?
Is this the older control with a single Cycle Start button..or does it
have 2. If it has 2 on the control face..contact your OmniTurn service
tech. If it has only one Cycle Start button...proceed below.
Do they both move..but one doesnt home? Does X move at all? If
not..have you pressed the Overload reset through the finger hole in
the right side of the control? If one is tripped...it will feel
mushy..a little resistance. Control has to be turned off for at least
2 minutes for them to reset in some cases. Try again. If all is
normal..proceed.
First thing you do is remove the cover and check to make sure both
servo amps are the same. If one is gold and one is black...the black
one has to be at least a NC-7 for the next thing to work. If they are
both black or both gold...swap the servo motor cables at the back of
the control. (press the Estop on the control before disconnecting the
servo motor cables.) After they have been swapped..X on Z and Z on X
outputs..release the Estop button and turn the servos back on (blue
button)
If one servo amp is an NC4 (small white lable on the right side of the
servo amp) and the other is any other type proceed with caution.
If when you hit Servo On button the servos start to make a rumbling or
grumbling noise..hit the E stop and contact your Omniturn service
tech for service call. If all is quiet..proceed. You may have a
unmatched pair of servo motors..which is ok..but some servo motors
will not work with some servo amps.
Pick 1 or 2 job speed in your job menu and see what moves. If both
move, try to home them. If the Z (plugged into X) now doesnt
home..you have a problem with the MC-2 card. If X (plugged into Z)
doesnt home..its a problem with the X servo motor. Contact NC
Electronics and order a replacement servo motor. They are "only" $900
or so dollars
If Z axis (plugged into X ) doesnt home, turn the control off,
restore your axis connections to normal.
Look into the RIGHT side of the control. If you see a long PC card
with (4) small Blue rectangular gizmos, each with a brass screw head
facing you...remove the front control panel. 2 screws on each side, 3
across the front. Lift it up, turn the panel facing to the left (jog
stick facing Left..and lean it up against the big blue capacitor.
If the card is veriticle...then you will have to remove the entire top
of the control. See NOTE below.
Disconnect all the cables you now see. They are plugged into the back
of a computer. There is also a white molex connecter that has to be
unplugged AND that wide 50 pin ribbon cable over to the right side.
Pull out the computer just a inch or two..and remove the last cable
from the top of the MC-2 card..making sure you know which way it
connects. Most of the newer ones are keyed..some older ones are
unkeyed. Pay freaking attention to which way its plugged in. Put some
magic marker on the side facing you before removing it. It simply
lifts off the 4 pins.
Take the guts to a work bench and look the guts over. Turn the
computer over..shake it out. See if any cuttings fall out. Use
compressed air to clean everything off. Remove the single screw
holding the black sheetmetal "clip" that holds the long printed
circuit card into the verticle printed circuit card that comes out of
the actual PC card. Slide out the MC-2 card.
Holding it in both palms..with the chips and Stuff on top..take your
thumbs and firmly press each intergrated circuit chip back into their
sockets. Some will "crunch" a tiny bit if they have worked their way
out of the sockets. Thats normal.
Take a scotchbright pad and GENTLY clean the card edge connectors gold
surface. You just want to brighten it a bit..not remove the gold
plating.
Set the MC2 card on a clean shop rag out of the way.
Remove the computer power supply (4 screws on the backside where all
the stuff was plugged in.
Remove the video card and the IO card (has a ribbon cable on it)
Clean the card edge connectors with a scotchbrite pad. Shine it...dont
scrub it off.
Remove the 2 phillips screws that hold the "riser card" that sticks
out of the computer board that the MC-2 card plugged into. and gently
pull the riser card up and out of the board. Use a scotchbright to
clean up the gold plated connectors..again only brightening them..not
scrubbing them off. Reinstall, put back the 2 screws holding it in
place. Reinstall the IO card (bottom) and the video card (top)
Reinstall your MC-2 card
Reinstall the black sheet metal "clip" and before tightening..make
sure the MC-2 card is horizonal..then tighten.
Reinstall computer inside the bottom of the control. Before sliding
it all the way in..install the 4 pin connector on the MC-2 card that
you MARKED before removal.
Install all the connectors on the PC. No 2 are alike and they are all
keyed.
Connect the white Molex connector with its other half. You may have to
play with it a bit to get the pins to line up. Shrug.
NOTE****...if you had to remove the top of the control to reach the
MC-2 card...simply life the top deck off, turn to the left until you
can see the retainer tha holds the MC-2 card vertically, remove the
(2) screws, remove the retainer bar..and remove the MC-2 card.
Everything else is the same..connectors, pushing the chips back in
with your thumbs etc etc. You will NOT have to pull the video card or
IR card.
Replace the front panel, install I screw center of the front. Power it
all up, turn servos on..and send both axis home.. If it will still not
home..you are somewhat screwed.
OmniTurn no longer services their MC-2 cards in an effort to force
you to upgrade your control for $4000+ to the latest (and very
reliable) new version....or you will have to purchase an entire NEW
MC-2 card for about $1500 and install it... as long as their stock
pile of MC-2 cards holds out.
If you have to buy a new card..Ill buy your old "bad" card. $50 plus
shipping. Omniturn will NOT want your old card back except to limit
the number of repairble cards floating around. Ive heard that they
will exchange it for a small discount..and Ive heard they dont want
them. Shrug.
If you have any questions or need someone to hold your hand as you
perform the above test/repair proceedure...call me
Gunner
Coyote Engineering.
OmniTurn service tech for 18+ yrs
805-732-5308
If you are in California, I can provide a service call (time,
material, mileage and travel time..which is somewhat negotiable
depending on your locale.) I base my time/travel from Ontario,
California.
I can provide a service call anywhere in the US, but you will buy the
plane ticket/travel time round trip and any expenses. If you are in
Aridzona..buying a round trip $100 red light flight ticket is cheaper
than me driving out.
I will NOT service Omniturns in Mexico.
Other nations are possible.
If the machine is in Mexico..you can ship the control to me for repair
and Ill ship it back in 24 hrs of delivery to me.
If the machine will run in both axis..but will simply not home in
X..you can ..can put the machine at X 0, hit home and it will likely
simply sit there. You can then run your parts normally
Mark "Gunner" Wieber
Nice job Gunner.
I'm saving a copy of this for future reference.