Kollmorgen AKD-B00306-NBAN-0000 Drive bus motor

Description

Kollmorgen AKD-B00306-NBAN-0000 Drive bus motor

Kollmorgen AKD-B00306-NBAN-0000 Drive bus motor

Dynamic braking is a method to slow down a servo system by dissipating the mechanical energy driven by the motor back EMF. The AKD has a built in advanced (patent pending) dynamic braking mode which operates fully in hardware. When activated, the drive shorts the motor terminals in phase with the back EMF (q axis) but continues to operate the non-force producing current loop (d-axis) with 0 current.

This forces all of the dynamic braking current to be stopping current and insures the fastest stopping/amp of motor terminal current. l When current is not being limited, the mechanical energy is being dissipated in the motor resistance. l When current is being limited, energy is returned to the drive bus capacitors. l The drive also limits the maximum dynamic braking motor terminal current via the DRV.DBILIMIT parameter to insure that the drive, motor, and customer load do not see excessive currents/forces. Whether and how the AKD uses dynamic braking depends on the disable mode (DRV.DISMODE).

Drives with an enabled holding brake function have a special timing for switching on and off the output stage (=> p. 93). Events that remove the DRV.ACTIVE signal trigger the holding brake to apply. As with all electronic circuits, the general rule applies that there is a possibility of the internal holding brake module failing. Personnel safety, e.g. with hanging load (vertical axes), requires an additional mechanical brake which must be safely operated, for example by a safety control. If velocity drops below threshold CS.VTHRESH or timeout occurs during a stop procedure, the brake is applied.

Every closed servo system normally requires at least one feedback device for sending actual values from the motor to the drive. Depending on the type of feedback device used, information will be fed back to the drive using digital or analog means. AKD supports the most common types of feedback device. Two feedback devices can be used at the same time, and all feedbacks are connected to X10. Feedback functions are assigned with parameters in WorkBench, the setup software. Scaling and other settings are also performed in WorkBench. For a detailed description of the parameters, please refer to the WorkBench online help. The table below provides an overview of the supported feedback types, their corresponding parameters, and a reference to the relevant connection diagram in each case.