EM-180

On/Off/Direction Change 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.