I. Preparatory Work
Import previously backed-up RC reference parameters, PID parameters, and temperature setpoints for each segment to restore basic process parameters.
Prepare an oscilloscope and a standard signal generator for calibrating RC filter performance. Ensure the hot runner is in a safe, room-temperature condition.
Confirm the temperature controller has completed its restart self-test, with no hardware fault alarms, and the system is operating normally.
II. RC Parameter Recalibration
Use the standard signal generator to input standard sine waves of different frequencies to the temperature controller input. Measure the current factory default RC network's filter cutoff frequency and interference attenuation.
Based on the actual interference frequency in the workshop, adjust the RC setting, setting the filter cutoff frequency to 1/5 to 1/10 of the target interference frequency, ensuring interference attenuation ≥20dB.
Verify the total RC time constant is ≤200ms and the temperature measurement signal delay is ≤200ms, confirming all performance indicators meet the current injection molding process requirements.
III. Performing Parameter Locking Operation
Enter the temperature controller's main menu, locate the "Signal Filtering Settings" sub-option, and select the "Dynamic RC Filtering Mode" configuration item.
Switch the default factory "Automatic Adaptation" mode to "Manual Locking" mode, and enter the final RC reference parameters after calibration.
After submitting the parameters, select "Enable Hardware Latching." The analog switch of the dynamic RC network will be hardware-forced to be fixed at the current position, preventing the system from automatically switching parameters from the ground up.
Set a dedicated administrator password, allowing only authorized process personnel to modify the lock status, preventing unauthorized personnel from misoperating.
Return to the main interface and confirm that the status bar displays the "RC Hardware Lock" icon, indicating that the locking operation has officially taken effect.
IV. Verifying Closed-Loop Operation After Locking
Continuously observe the temperature readings for 30 minutes to confirm that there are no jumps or oscillations, and the temperature control accuracy meets process requirements.
Simulate the maximum interference conditions in the field to confirm that the RC lock status has not been triggered or changed, and the filtering performance is stable and meets the standards.
Enter the RC parameters and operation time of this re-locking into the process file and update it synchronously for subsequent calibration cycles.
