SMC-301 Kollmorgen
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The Kollmorgen SMC-301 is a board-level bipolar chopper driver from the SMC Motion Stepper Drives series. It features built-in chopper logic, adjustable speed output, and uses a single power supply. The drive supports TTL input logic level and offers ramp selection via DIP switch and current limit adjustment with a potentiometer.
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Product Description:
The SMC-301 is a stepper-motor control card produced by Kollmorgen for the SMC Motion Stepper Drives series. Offered as a compact motion controller, it translates digital step-and-direction commands from a PLC into the current waveforms required by a two-phase stepper motor. Within automated pick-and-place stations or indexing tables, the board governs speed profiles and positioning without requiring external sequencing hardware. By integrating power regulation, chopping circuitry, and ramp profiling on a single board, it reduces panel space and simplifies axis installation.
Drive output is generated by a bipolar chopper driver, so phase current is switched at high frequency to minimize motor heating while sustaining torque. The switching action is managed by built-in chopper logic, eliminating the need for auxiliary gate drivers. The current limit is set with a front-edge potentiometer, allowing the setting to be matched to the motor winding rating without software changes. Control signals are accepted at TTL logic levels, enabling direct connection to standard 5 V controllers. All power for the board is derived from a single supply, simplifying backplane wiring and eliminating dual-rail power requirements. This power arrangement also reduces the number of supply connections needed between the card and the host control system.
The board-level form factor allows the card to mount on standoffs next to the host CPU and share the same ground plane. Acceleration and deceleration curves are chosen with a DIP switch, and the selected profile is executed by an adjustable ramp generator that shapes velocity and reduces mechanical shock. The onboard sequencer handles homing and microstep ordering through integrated logic, while an input pulse-rate buffer smooths burst traffic from high-speed indexers. Status is reported through a dedicated Busy output, allowing the host controller to determine when a commanded movement remains in progress. The speed-reference voltage can be trimmed to adjust the speed output for the connected motor and load. Supported I/O connections include step, direction, home, and a winding-current reduction line for lowering current when full holding torque is unnecessary.
