Mitsubishi’s Simple Motions reduces cutter control costs.

The MELSEC-L Series Simple Motion module LD77MS enables advanced motion control functions such as positioning, speed control, torque control, cam control, synchronous control and mark detection to be realised easily with just simple parameter settings, and ideal for reducing cutter control costs.

Rotary knife application

Rotary knife applications involve 2 axes of servo to continually or intermittently perform a cut, labeling procedure, or stamping process where the servo axis 1 aligns itself to move at the same speed as a feed axis 2 that drives a material to be cut/stamped/labeled. The servo axis 1 (or slave axis) moves according to the feedback of the axis 2 driving the belt (master axis) so that it can coordinate its movement with speed changes.

Mark sensor compensation

In a typical rotary knife application, the servo motor continually moves. If the distance between cuts is small (smaller than the circumference of the cutter), the motor speed during the non-cut compensation region is faster than the conveyor speed and vice versa. In this type of application, the cut length, label or stamp location may change and it is possible that the feed material may slip, stretch, or bind up, causing the operation’s accuracy to change. The addition of a mark sensor before the servo axis can help to compensate for these fluctuations.

High-speed registration

The LD77MS provides a simple solution rotary knife application. With high speed registration capability, Auto-cam-generation, and electronic pulse compensation functionality during non-cut regions, the LD77MS can accurately respond to input pulses from an external encoder or a servo master axis.

A variety of controls including homing, positioning control, speed control, torque control, cam control and synchronous control can all be achieved with the 39 certified Function blocks. The LD77MH4 is suitable for linear interpolation up to 4 axes and circular interpolation of 2 axes.  The LD77MH16 is suitable for 16 axes of control.

Simple motion is part of the L Series PLC range from Mitsubishi Electric at 999 Automation

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