• DRIVERS ARE OPTICALLY ISOLATED AND INTERNALLY BIASED

• PROGRAMMABLE LINEAR ACCELERATION/DECELERATION TIME AND
  MOTOR SPEED

• MANUAL AND REMOTE MODE OF OPERATION

• PAUSE MODE

• HALF STEP MODE FOR IMPROVED RESOLUTION

• HIGH CURRENT DRIVE IN EXCESS OF SIX AMPS

The JOERGER ENTERPRISES, INC., MODEL SMC24B is a self-contained stepping motor controller and optically isolated driver packaged in a single width CAMAC module. It's features provide the ability to satisfy most stepping motor applications. The standard unit has adjustable linear acceleration and deceleration to provide an efficient method of driving high torque loads at their maximum speed. The standard speed range is 50pps to 5000pps with other ranges available if required. The four drivers are capable of switching up to four amps per phase at 24 volts, with an optional capability of over six amps. To simplify installation, the drivers are biased internally. Three external inputs are used to test the status of the clockwise limit, counterclockwise limit, and a signal that indicates power is being applied to the motor. The number of steps is determined by a 24 bit command word that is in 2's compliment. An interrupt structure is provided to improve system integration. A LAM will be set by either a CW or CCW limit or when the counter reaches zero, indicating the end of a cycle. The drive sequence can be programmably selected to be either two phase, wave drive or half step when improved resolution is required. A pause mode is also available which will allow the motor to be stopped during an operation. This feature utilizes the acceleration/deceleration ability of the module to insure no missing steps. In an emergency situation there is also an abort command which stops the motor abruptly and resets the module. The motor may be clocked with external signals using the modules drivers and can also be driven manually by means of a front panel switch. To provide the ability to drive motors that require more than 6 amps, two types of output signals are provided that can be used by an external motor driver. CW and CCW pulse trains are available and also a clock signal and a direction bit. These signals contain the acceleration time and speed information generated by the module. Acceleration time and motor speed are normally set by front panel pots. As an option, they can be set programmably.