tailieunhanh - Unipolar Controller Board Data

This is a simple unipolar stepper board that can control stepper motors rated to 30VDC. The FET drivers are rated at 50A, but in practicality this board should not be used with motors anywhere near that current for several reasons. The power supply voltage, heat sinks and cooling used for the FET’s of your own application play an extremely important part in making that determination. The FET package is designed for 50 Watts of dissipative power. If you’re not wise in electronics, the board should be built in stages and tested during each stage to eliminate problems | 12 5 2005 Unipolar Controller Board Data Introduction This is a simple unipolar stepper board that can control stepper motors rated to 30VDC. The FET drivers are rated at 50A but in practicality this board should not be used with motors anywhere near that current for several reasons. The power supply voltage heat sinks and cooling used for the FET s of your own application play an extremely important part in making that determination. The FET package is designed for 50 Watts of dissipative power. If you re not wise in electronics the board should be built in stages and tested during each stage to eliminate problems. Picture Courtesy of CNCZone s slp_prlzys JP1 Inputs Same orientation as the board layout above. Iga Dir to oi Step o bj Í GND to_OJ EXT 5V b cj Using an external 5VDC Supply Optional By not installing IC2 7805 5VDC on board regulator an external 5 volt DC supply can be used. External 5VDC can be supplied via the E5 connection point. For the highest reliability and noise immunity install IC2. Using the onboard 5VDC By installing IC2 7805 5VDC on board regulator an external DC supply form 8VDC to 30VDC can be used. That power supply is connected via the X4 Wago connector. Observe polarity when connecting. Using the board The board was designed with a high noise immunity environment in mind. Switching heavy currents and inductive loads are prone to noise. For that very reason IC1 is utilized to provide excellent noise rejection. There are two options for IC1. Either a 40106 or 74HC14 Schmitt Trigger Inverter can be installed. The 40106 is older slower technology is preferred for the best noise immunity but can t be relied to be driven directly by a PC s parallel port. If driving from a PC parallel port with no active conditioning logic a 74HC14 must be used. Current Limiting Resistors IMPORTANT Anytime a power supply for the stepper motor is used that is greater than the rated voltage of the motor current limiting resistors are required. This board does .