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Is there no parameter setting for that?
Other than that, a knowledgeable tech could likely physically reverse the motor polarity and encoder leads to reverse it.
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Anyone know how to change the A axis direction at the control on a Fadal?
I need CW to be CCW.
Is there no parameter setting for that?
Other than that, a knowledgeable tech could likely physically reverse the motor polarity and encoder leads to reverse it.
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
With Fanuc, Mitsubishi and others, there is a parameter bit to set for a 1 for + or 0 for - clockwise, If can get hold of a Fadal servo parameter sheet it may show the same set up.
Other than that you could go the route Hu mentioned of lead reversal, the only problem with that if it is an AC servo, there could be problems with the commutation signal.
Al.
CNC, Mechatronics Integration and Custom Machine Design (Skype Avail).
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
Most people that have Fadals mount the indexer on the right side of the table as the plug for the cable is on that side. If you mount it on the left side of the table it will seemingly rotate in the opposite direction (not really). May not help in your situation though. Do you have programs from some other machine you want to run on this Fadal? Minor program edits will change the program, unless you have a ton of index blocks.
Alloyspec
I called a tech this Sat and he tells me no, no way.
Seems like there should be a parameter for this.
I thought of mounting on the left side of the table but the cable would cause a lot of problems, it would be very difficult to keep it out of the way even if it would reach. The natural position would put the cable across the middle of the table and routing it around with cable ties or something I don't think it would reach.
Dave,
So is this a brushless motor setup?
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
No, brush DC servos Hu.
I asked him about flipping a couple of wires but he said that several other things would have to change as well. Ward mentioned that the resolver direction would have to be flipped as well.
If you have a resolver instead of an encoder, I would say that you would have to swop the DC to the motor and one pair of the secondary leads of the resolver, In the case of an encoder it would be the A & /A channels. If you change the direction of both motor and feedback, the control does not know this, as long as one confirms the other.
Also if the motor has a tach, that would have to be swopped also.
I am suprised they do not have that in the control, because if it does not, then when a Machine is set up for +- direction this physical process would have to be gone through.
Al.
CNC, Mechatronics Integration and Custom Machine Design (Skype Avail).
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
Can't you just mirror the A axis?
Add this to your program:
Code:G51.1 A0
Are you using a Fadal 4th axis or some other brand? If the motor mounts direct like the Fadal unit does, there is a solution. But it is not a quick one. The 4th axis on my machine at work is a SMW that we mounted the motor above and on the back side of the indexer.With this setup the motor does not hang way out to the side like the Fadal unit. We use a gilmer belt with one-to-one ratio to drive it and this reverses the direction from standard. I am not sure you would want to go to this much trouble though.
Alloyspec
The table is a Fadal VH165.
Never heard of G51.1, I'll check that out.
Thanks
Iam not sure if iam reading question right, but I usually use a positive A or negative A value to make our 4th Axis rotate eather direction. And if my post is posting the opposite of what I want, I usually mass modify A to A-. Forgive me if iam way off on this subject.
Z
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