The Mach3 USB controller can only output pulses and direction signals (5V logic signals).
To connect your Mach3 USB controller RNR controller with a servo AC that has a 24V open collector, you will need to use a level shifter circuit to convert the 5V pulses from the controller to 24V pulses that the servo can accept.
One way to do this is to use a simple transistor-based level shifter circuit. Here are the steps to connect your Mach3 USB controller RNR controller with a servo AC using a level shifter circuit:
Connect the 5V output signals from the Mach3 USB controller RNR controller to the base of the NPN transistor in the level shifter circuit.
Connect the collector of the NPN transistor to the 24V power supply.
Connect the open collector output of the servo AC to the emitter of the NPN transistor.
Finally, connect the ground of the Mach3 USB controller RNR controller and the servo AC to the ground of the 24V power supply.
The level shifter circuit will act as a switch, allowing the 24V power to flow to the servo AC when the 5V signal from the controller is present.
Remember that the MAch3 USB controller only outputs pulses for steps per rotation of a motor. If the servo requires a different method of motor rotation, this will not work.
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 Hello. I have rnr controller. My problem is connection with servo ac. My servopack have logic Voltage 24v open collector. How Connect and what i need to Connect rnr with servo if rnr have 5v logic. Thx