RR-CirKits SMD-8 8-Output Stall Motor Driver Board

RR-CirKits SMD-8 8-Output Stall Motor Driver Board

LCC sample mode compatible. This 8 output, optically isolated, low current "H" bridge driver is designed for control of 8 stall motor switch machines. (E.g. Tortoises®) It can drive up to 100ma. per line, speed regulated output 6 to 12VDC. (PTC fuse limited to 200ma total per board for safety).

All RR-CirKits Tower Controller I/O modules are designed to either be plugged directly into the TC-64, or else mounted in Tyco 3-1/4" Snap-Track® mounted to the bench work and connected with short ribbon cables. (Snap-Track® is a plastic channel designed to mount PC cards to a chassis, not something to run trains on.) Each I/O module is equipped with two connectors to facilitate these connection options.

SMD-8 (Stall Motor Driver - 8 line)

The SMD-8 board contains 8 individual, optically isolated, HBridge drivers. This allows the board to be powered from any supply between 9 Volts and 18 Volts. It is primarily designed to drive stall motor turnout machines. Do not exceed 15VAC or 24VDC at the power input. This board includes an adjustable regulator to allow you to control the speed of your switch machine motors. This regulator will draw 100ma. plus your load current, and the board normally runs warm even with no load. If it runs too hot, reduce the input voltage.

The SMD-8 drivers do not include clamp diodes and should not be used to directly drive inductive loads such as relays or solenoid coils unless external clamps are used. The outputs are wired in an "H" bridge configuration but may be used single ended for On-Off control. Both + and - return lines are provided for single ended (continuous) operation.

The SMD-8 outputs are rated at 100ma. per line, not to exceed 200ma. The board includes an auto reset fuse that will prevent extended operation in excess of 200ma. continuous output current per board, but it will NOT protect it from from direct short circuit currents.Short circuits on any output line may damage the board, so be careful of your wiring.

The SMD-8 input lines are active low so the TC-64 should be configured as "Driver" for any port that is connected to a SMD-8. This inverted input mode matches most types of driver outputs, and the drive polarity may be easily switched either in the TC-64 setup or by simply reversing the SMD-8 output lines.

Speed Control

The SMD-8 includes a speed control adjustment to allow you to adjust the motor speed from a crawl suited for crossing gates and semaphores, to a brisk movement for Turnouts.