How to Adjust RC Parameter Calibration Cycles for Different Process Scenarios

I. Basic Cycle Adjustment According to Process Accuracy Level

General Injection Moulding Processes for Ordinary Structural Parts (PP/PE/ABS): The baseline calibration period is 12 months once the RC parameters are locked. This approach is based on the precise temperature of ≤ ±2℃, has excellent tolerance for RC drift and does not need high-frequency calibration.

Injection Moulding Processes for Medium Precision Engineering Parts (PC/PA6/PA66) Baseline calibration period is 8 months. This process has increased demands for temperature stability. The anti-interference effectiveness of RC filters should be checked regularly to avoid the damage of materials due to heat.

High-Precision Optical-Grade Injection Moulding Processes (Optical-Grade PC/PMMA): The baseline calibration cycle is 4 months. This method requires the whole runner to have a temperature differential of ≤ ±1℃. Even a small RC drift might cause signal delay and temperature oscillation and hence a more frequent calibration.

Injection moulding processes for highly degradable and sensitive materials (PVC/POM/PET) The basic calibration cycle is 3 months. Here overheating is not tolerated at all. Temperature jumps generated due to RC filter failure will immediately cause material decomposition, high frequency calibration and verification.

II. Dynamic Adjustment Rules in Terms of Production Load and Operating Condition

Scenario for 24-hour continuous full-load production: The calibration cycle of each process is shortened by 30% across the board. Long term continuous usage accelerates the ageing of RC hardware and increases greatly the parameters drift.

High Electromagnetic Interference Workshop Scenario: Several high-power injection moulding machines are grouped together, and the power lines and temperature measurement lines are laid on the same cable tray. The calibration cycle of all the processes is uniformly shortened by 50% to avoid the performance degradation of locked RC parameters caused by the change of interference characteristics.

Cleanroom Low-Interference Scenario: Standardised wiring and exceptionally low electromagnetic interference enable 50% calibration cycle extension for all processes, saving unnecessary maintenance expenses and maintaining accuracy.

III. Conditions of Forced Adjustment That Trigger Immediate Calibration

RC calibration is performed right after the annual comprehensive maintenance of the hot runner system and rewiring of temperature measurement lines, so that the new signal connection impedance characteristics are matched.

When high power frequency converters, servo motors or other powerful interference sources are put into the workshop, greatly changing the electromagnetic environment on-site, RC parameters are promptly calibrated to adapt to the new interference characteristics.

Thus we have seen faults like spikes in temperature readings and overshoot in temperature growth. Once the defects are fixed, RC calibration is done right away, avoiding any chance of parameter drift.