Archives

In PWM & Direction mode, the input PWM signal directly controls the output PWM power devices. Typically the PWM input duty cycle will control the drive’s output current level. Direct PWM uses only rudimentary current limiting, while Torque Mode PWM uses current feedback to close the current loop. Benefits Direct PWM gives the fastest possible … PWM & Direction

Current Mode Control allows for precise torque control, making it suitable for applications that require high accuracy and responsiveness, such as robotics, CNC (Computer Numerical Control) machines, automation systems and more. In Current Mode, the input command controls the output current. Only the current loop is active in this mode, and the velocity loop and … Current Mode Control for Servo Drives

In the context of servo drives, velocity mode refers to a control mode where the servo drive turns the motor at a velocity that is proportional to the command. Small commands will generate small velocities and large commands will generate large velocities. Velocity Mode requires the use of a velocity feedback device, such as an … Velocity Mode Control for Servo Drives

The position loop regulates the position of the motor or system. In Position mode control, feedback such as an encoder or resolver ensures that the actual position is equal to the commanded position. The servo drive’s position loop compensates for position errors by applying more torque to push the system back into position. If an … Position Mode Control for Servo Drives

In a profile mode of operation, the trajectory is limited by the drive. Profile modes use the command limiter values to limit the maximum command rate. Cyclic Synchronous modes give responsibility of trajectory control to the host. The drive interpolates between command points, defining the rate by dividing the change in command by the interpolation … Profile / Cyclic Synchronous Modes

For brushed motors only, IR Compensation is a “pseudo-velocity” mode because the actual motor velocity is not measured. The velocity loop is closed by estimating motor velocity by using the motor terminal voltage and the motor current. An increase in the motor current is interpreted as the motor slowing down because of a system disturbance, … IR Compensation

In Duty Cycle Mode (also called Open Loop Mode), the output duty cycle of the switching devices is directly proportional to the input command. Benefits Duty Cycle Mode offers similar performance to Voltage Mode ADVANCED Motion Controls’ Capabilities Some analog brushless drives can operate in Duty Cycle (Open Loop) Mode Industries, Technologies, and Products related … Duty Cycle (Open Loop)

Excessive acceleration and deceleration can damage parts, products, or the machine itself if not actively controlled. Benefits Acceleration and deceleration limits set by the drive will smooth out sudden movements Accel / decel rates are fully configurable ADVANCED Motion Controls’ Capabilities DriveWare® is used to set accel / decel rates for DigiFlex® Performance™ drives Some AxCent™ drives use potentiometers … Accel / Decel Control