MSE422 4 Channel 600 mA per Channel Stepper Drive

This 4 axis compact chopped constant current bi-polar drive conforms to the international extended 3U eurocard standard. It is ideally suited for use with the range of permanent magnet and small hybrid instrument motors 1.5 amps per phase. The ability to operate with rail voltages up to 30 Vdc provides excellent high speed performance with a choice of full step or half step phase control when improved low speed and mid range stability is achieved. The design which provides fully independent control of 4 motors on a single Eurocard is therefore ideally suited for use in instrumentation and scientific apparatus requiring a multiple axis drive capability. Matching motors to the drive is simplified by the provision of a 4 position DIL switch to enable motor phase current to be set between 80 & 600 milliamps per phase. An external contact closure enables reduced current for operating the motor in a stationary condition thereby minimising motor temperature rise and system power consumption. Additionally, a 10 K Ohm potentiometer may be used to provide proportional control of motor current thereby providing the exact current setting required to suit the motor operating condition. The units are controlled by clock pulses and direction signals which may either be CMOS compatible for maximum noise immunity or of the TTL open collector type.