Hi Folks, I have the same need. People here are trying to be helpful, but not really answering the actual question when suggesting using a different motor or adding a tach or another motor as a tach for example. It would be great if we could do this, but it isn't possible.
I'll try to give some background (at least on my need). Many older automated machines out there simply do not have the ability, moslty due to outdated controls and software, to be converted to newer drives and motors. furthermore, space and cost constraints force us to try to retrofit newer parts to what is already there. There are commercially available conversions, but they are not cost effective. We cannot afford to spend $1,200 on such a package to replace a $300 motor six times over on a dozen machines.
The problem is that the OP seems to (and I) have older systems that use tachomotors for feedback. The replacement motors usually have encoders, and in my case 500 CPR quadrature (motors we are using on newer versions of the same machine). What we need is a simple D-A circuit that can be wired in-between the NEW motor and the OLD drive so that when the motor spins, the encoder pulse counts are converted to a voltage (in my case 0-12V). The converter needs to have some sort of Pot to adjust the voltage so that the encoder converts to the right voltage, and the circuit needs to be linear so that as the encoder pulses increase, the voltage increases.
I realize I can probably just use one phase of the encoder to get this done, but nothing I have tried seems to work. Being able to do this will allow us to fool the machine into thinking it has a tachmotor when really it has a newer encoder motor so it works properly. I have dozens of machines I need to retrofit at a low cost, and making a simple A-D converter to put in-line with the encoder and tach inputs would do the trick.
Can anyone offer a solution that just does this and doesn't require replacing the motor, tach or adding a tach?
Much appreciated.
Moderator's Note:
Please don't hijack other member's thread, now you have your own.
This thread was split from --
help to replace tacho generator
https://forum.allaboutcircuits.com/threads/help-to-replace-tacho-generator.116948/
I'll try to give some background (at least on my need). Many older automated machines out there simply do not have the ability, moslty due to outdated controls and software, to be converted to newer drives and motors. furthermore, space and cost constraints force us to try to retrofit newer parts to what is already there. There are commercially available conversions, but they are not cost effective. We cannot afford to spend $1,200 on such a package to replace a $300 motor six times over on a dozen machines.
The problem is that the OP seems to (and I) have older systems that use tachomotors for feedback. The replacement motors usually have encoders, and in my case 500 CPR quadrature (motors we are using on newer versions of the same machine). What we need is a simple D-A circuit that can be wired in-between the NEW motor and the OLD drive so that when the motor spins, the encoder pulse counts are converted to a voltage (in my case 0-12V). The converter needs to have some sort of Pot to adjust the voltage so that the encoder converts to the right voltage, and the circuit needs to be linear so that as the encoder pulses increase, the voltage increases.
I realize I can probably just use one phase of the encoder to get this done, but nothing I have tried seems to work. Being able to do this will allow us to fool the machine into thinking it has a tachmotor when really it has a newer encoder motor so it works properly. I have dozens of machines I need to retrofit at a low cost, and making a simple A-D converter to put in-line with the encoder and tach inputs would do the trick.
Can anyone offer a solution that just does this and doesn't require replacing the motor, tach or adding a tach?
Much appreciated.
Moderator's Note:
Please don't hijack other member's thread, now you have your own.
This thread was split from --
help to replace tacho generator
https://forum.allaboutcircuits.com/threads/help-to-replace-tacho-generator.116948/