1. Overview
Its primary purpose is to prevent Overcurrent Alarms and subsequent motor shutdowns that can occur when the servo motor maintains high torque for an extended period during tonnage build-up. By automatically managing the movement to the Zero Tonnage Point, the system eliminates the risk of a “Free-run” situation—where the mold opens uncontrollably due to stored mechanical energy after a motor power-off.
2. Operational Logic
- Safe Toggle Release
- During Tonnage Build-up: If the button is released while clamping force is increasing, the system will not hold the current high-pressure state. Instead, it will automatically Retract to the Zero Tonnage Point to safely dissipate the stored tension.
- During Tonnage Release: Even if the button is released while clamping force is releasing, the machine ensures a minimum movement to at least the Zero Tonnage Point, guaranteeing that the toggle is fully released from its high-tension state.
- The system executes the release at a fixed speed of 100 mm/s, utilizing up to the motor’s Maximum Torque to ensure a reliable return to the Zero Tonnage Point.
- Soft startup from released position
- To ensure seamless operation after a release, the system manages the restart acceleration:
- Reduced Acceleration: When resuming “Mold Open” or “Mold Close” from an intermediate position, the system starts at 20% of the standard Mold Open acceleration.
- Alarm Prevention: This prevents the Acceleration Torque from exceeding the Mold Protection Alarm threshold. It ensures that the machine can resume motion safely without triggering false alarms caused by sudden torque spikes.
