The drive is developed for controlled ON-OFF driving and direction change of a DC-brushed motors. The drive has advanced current limit features. It limits the motor current in start-up and jam situations and that way protects the motor and mechanics from over torque. The drive also has an error output to indicate error / over current situations.,The acceleration ramp time for start-up is adjustable to suit different applications. In other word the motor voltage is slowly raised to give a smooth start-up. When the control is set to off, the motor is dynamically braked utilising short-circuit braking. The reverse and forward commands can be set for positive or negative control. The free-wheel command sets motor to run free. Free-wheel overrides both the forward and backward commands.,The current protection is double acting. First there is a continuous and adjustable current limit which decreases the motor voltage if the current exceeds the adjusted value. Second there is settable trip feature that cuts the motor voltage if the current limit value is exceeded (after trip delay 2ms). After trip the motor starts only to the opposite direction. Additionally the driver doubles the adjusted current value for 0.3 seconds in start-up to ensure sufficient power to overcome the start-up friction.

Fast change of direction
Soft start-up, acceleration ramp
Settable current limit
Trip or continuous current limit
Dynamic braking

The EM-318 is a micro stepping stepper motor controller using bipolar-chopper control. The bipolar operation principle suits most stepper motors and provides the best torque control.The micro stepping function also enables great performance at low rpm,stepping and current regulation is synchronized giving a smooth and quiet operation.

High efficiency drive with low RF emissions
Soft start-up, acceleration ramp
Adjustable current limits (continuous and trip levels)
Freewheel option
Dynamic braking
Start-up kick feature to overcome inertia