Meaning
The time interval between the trigger event on an injection molding machine and the execution of the command by the hydraulic or electric actuators determines process repeatability. This time gap, defined as machine controller latency, governs the accuracy of the transitions from high-pressure injection to pack-and-hold stages. The measurement applies to high-speed molding machines and stops being a critical factor in slow extrusion processes where flow rates remain constant over long periods.
Signal Delay
Industrial computers process signals through analog-to-digital converters and bus systems before executing physical movements. Machine controller latency represents the sum of these processing delays and valve response times. Newer controllers use real-time Ethernet buses to minimize this electronic lag.
Switchover Precision
Delay in the switchover from velocity control to pressure control causes the screw to travel further than the setpoint allows. This uncontrolled movement leads to overfilling of the mold cavities. A highly repeatable process requires this electronic delay to remain below one millisecond.
Quality Impact
Variations in this control lag cause shot-to-shot weight differences and flash defects on thin-walled molded items. Precise control over this parameter enables the machine to execute consistent velocity transitions. Thin-wall packaging applications rely on this electronic speed to prevent part damage.
