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Show"N"Tell ( Your Machines) / Re: emco 5pc spindle motor help
« on: September 20, 2007, 05:57:18 PM »
Hutchison,
I didn't mean to sound too techie. I just figured anyone who would breakout the soldering iron and have a go at their machine would be an Electronics guru.
regeneration stops the motor by turning it into a generator and driving the kinetic energy back into the controller, the end result is if you spin the 3/4 turn speed pot on my lathe's regen motor controller from full speed to zero the motor is stopped before you take your hand off the pot. Nice feature for safety but can be stressful on machine or parts. Not required.
IR comp is a feedback feature, kind of like a closed loop speed controller where you call for a speed, actual speed feedback is sent to the controller and the controller will boost output if speed drops to maintain it at a constant speed. The IR comp is looking at current and resistance to provide the same response and is very close to closed loop, but you don't have to pickup any outside signals because the drive controller already has the IR built in.
Chopper is just a description of how the power is converted from AC to a variable voltage DC, the full AC wave is rectified at the highest speed setting (highest DC voltage) and only part of the full AC wave is rectified at a lower setting, (part of the wave is chopped off).
PWM to V converter, a circuit that takes a pulse (mach3 speed control signal from the parallel port) and converts that pulse signal into a Voltage (a lot of the controllers will accept a 0-10 voltage signal as the speed demand signal) The PWM signal is a fixed frequency with a variable width (on duration).
I took a look at that Fincor drive http://www.saftronics.com/PRODUCTS/DCDRIVES/2330/2330L.htm, it looks like it would work fine, maybe a little pricey but it probably cost $230 usd new. It may not have the option of the 0-10 volt signal input, if you can get the full model number and look at options in the manual.
I didn't mean to sound too techie. I just figured anyone who would breakout the soldering iron and have a go at their machine would be an Electronics guru.
regeneration stops the motor by turning it into a generator and driving the kinetic energy back into the controller, the end result is if you spin the 3/4 turn speed pot on my lathe's regen motor controller from full speed to zero the motor is stopped before you take your hand off the pot. Nice feature for safety but can be stressful on machine or parts. Not required.
IR comp is a feedback feature, kind of like a closed loop speed controller where you call for a speed, actual speed feedback is sent to the controller and the controller will boost output if speed drops to maintain it at a constant speed. The IR comp is looking at current and resistance to provide the same response and is very close to closed loop, but you don't have to pickup any outside signals because the drive controller already has the IR built in.
Chopper is just a description of how the power is converted from AC to a variable voltage DC, the full AC wave is rectified at the highest speed setting (highest DC voltage) and only part of the full AC wave is rectified at a lower setting, (part of the wave is chopped off).
PWM to V converter, a circuit that takes a pulse (mach3 speed control signal from the parallel port) and converts that pulse signal into a Voltage (a lot of the controllers will accept a 0-10 voltage signal as the speed demand signal) The PWM signal is a fixed frequency with a variable width (on duration).
I took a look at that Fincor drive http://www.saftronics.com/PRODUCTS/DCDRIVES/2330/2330L.htm, it looks like it would work fine, maybe a little pricey but it probably cost $230 usd new. It may not have the option of the 0-10 volt signal input, if you can get the full model number and look at options in the manual.