This document describes the basic functionality and the electrical specifications of StepperOnline's Three Axis TB6600 CNC Driver Board This document describes the basic functionality and the electrical specifications of StepperOnline's Three Axis TB6600 CNC Driver BoardSupports MACH3, KCAM4, EMC2 etc Can drive four channels 4.5A stepper motors, input voltage up to 18V - 40V.Resolution 1, 1/2, 1/4, 1/8, 1/16 micro stepping output. Full DC-DC optical isolation to protect the user's computer and equipment.Four channels of 0.4 - 4.5A adjustable output current for 2/4 phase bipolar stepper driver.Build with 3 ways relay output and 5 ways limit interfaceAutomatic idle-current reduction.Dimension:Approx.18.5cm x 11.2cm x3cmQuantity:1PC Electrical Properties(ambient temperature Tj = 25C)Input VoltageInput Voltage12V-45VDC, Recommend DC24V or DC36VOutput Currentfor Peak Current 5A/phase, 8 Options availableDriving ModeConstant current PWM ControlExciting Mode1, 1/2, 1/4, 1/8, 1/16Current SettingCurrent SettingCurrentCurrent0.4A1.6A2.6A3.2A3.8A4.0A4.3A4.5AS1ONOFFONOFFONOFFONOFFS2ONONOFFOFFONONOFFOFFS3ONONONONOFFOFFOFFOFFSubdivision Setting SubdivisionNCWarning Make sure the power supply voltage dose not exceed the drive's input range. Double check the connections and make sure the power lead polarity is correct. Do not set high current to small stepper motor. It is possible that the motor will be damaged. Disconnect the motor from the load if you are not sure the move direction. Adjust the axis in the middle before trying to run the motor. Never disconnect the motor lead when the power source is energized.