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converting to servo
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I need to convert the x axis on my big router from stepper to servo
I have on hand some of the first rev Gecko 320 drives and nice Wagner{aka Baldor] servos. The encoders have 8 leads. Won't I need a differential to TTL "translator? The encoders are Renco 800 ppr Also, these motors have a 24v normally on brake, do I have to dissasemble them? I was thinking of a second set of switches NC and wired in series with 24v ? Lastly, if I bench tune won't I have to retune under load? thanks Carl |
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--- In mach1mach2cnc@..., "carlcnc" <carlcnc@y...> wrote:
I need to convert the x axis on my big router from stepper to servoa differential to TTL "translator? The encoders are Renco 800 ppr You can just use one set of signals and disregard the differential outputs. It doesn't matter which set but they need to be the same. Differential encoders have two leads that respond to each pulse, one goes from low to high and the other goes from high to low at the same time. You should be able to get specs on those motors. I don't know what your gearing is to the leadscrew but with a 800 ppr encoder (3200 in quadrature) you may get into pulse count issues. If your leadscrews/gearing adds X 5 then you are already at 16,000 pulses per inch so a rapid of 120IPM requires 32,000 pps. MACH2 will do that but not on all computers. Also, these motors have a 24v normally on brake, do I have toDON'T disassemble the motors. You may very well ruin the motor. I was thinking of a second set of switches NC and wired in series with 24v ?If you have a contactor on the DC side of things with a spare set of contacts you could wire the brakes to that. What I am talking about is a contactor (big relay) that pulls in and latches on when you hit the manual Start button and turns off under any condition where the machine needs to stop quickly (limits, e-stop, safety switches, etc). The brakes are made to be active on power failure which is the best way. Lastly, if I bench tune won't I have to retune under load?Well, maybe. Tim Goldstein (I think) has worked out a way to simulate a load on the bench to set the dampening that gets around having to retune on the machine. Check his website about tuning Gecko's
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John Craddock
You also can get made-up differential receiver /transmitters from Rutex. See . Differential transmission can save a lot of headaches.
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HTH Regards John C -----Original Message-----
From: caudlet [mailto:thom@...] Sent: Tuesday, 29 July 2003 9:16 AM To: mach1mach2cnc@... Subject: [mach1mach2cnc] Re: converting to servo --- In mach1mach2cnc@..., "carlcnc" <carlcnc@y...> wrote: I need to convert the x axis on my big router from stepper to servoa differential to TTL "translator? The encoders are Renco 800 ppr You can just use one set of signals and disregard the differential outputs. It doesn't matter which set but they need to be the same. Differential encoders have two leads that respond to each pulse, one goes from low to high and the other goes from high to low at the same time. You should be able to get specs on those motors. I don't know what your gearing is to the leadscrew but with a 800 ppr encoder (3200 in quadrature) you may get into pulse count issues. If your leadscrews/gearing adds X 5 then you are already at 16,000 pulses per inch so a rapid of 120IPM requires 32,000 pps. MACH2 will do that but not on all computers. Also, these motors have a 24v normally on brake, do I have toDON'T disassemble the motors. You may very well ruin the motor. I was thinking of a second set of switches NC and wired in series with 24v ?If you have a contactor on the DC side of things with a spare set of contacts you could wire the brakes to that. What I am talking about is a contactor (big relay) that pulls in and latches on when you hit the manual Start button and turns off under any condition where the machine needs to stop quickly (limits, e-stop, safety switches, etc). The brakes are made to be active on power failure which is the best way. Lastly, if I bench tune won't I have to retune under load?Well, maybe. Tim Goldstein (I think) has worked out a way to simulate a load on the bench to set the dampening that gets around having to retune on the machine. Check his website about tuning Gecko's
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