Product Description

The SMC242B is a self–contained stepping motor controller and optically–isolated driver packaged in a single–width CAMAC module. The standard unit has screwdriver–set linear acceleration/deceleration with a standard speed range of 50 to 5000pps, again screwdriver–set; other ranges are available if required, and there is an option where both of these functions are programmable.

The four phase drivers can switch up to 4A at 24V, and there is a high–power option which drives at over 6A per phase; drivers are biased internally. Combining the high–power and programmable speed/acceleration functions changes this to a two–width unit. Three inputs bring in clockwise and anticlockwise limits and a ’power applied’ signal, and the number and direction of steps is programmed in a 24 bit 2’s complement register. A LAM is set if either limit is reached or on the register counting down to zero.

The phase sequence can be software set to be two–phase, wave–drive or half–step, and there is a ’pause’ mode which allows the motor to be stopped when running without any steps being lost, and there is an ’abort’ command to stop the motor in an emergency.

The module’s drivers may be clocked by external signals, and there is a front–panel manual control switch, while for motors that need more than 6A drive there are step–and–direction O/P available for use with an external driver.

Indicators are provided for N, Active, Pause, Ext. Pwr. and CW and CCW limits.