I. Standard Calibration Cycle
General Injection Molding Scenarios: Under continuous production conditions, recalibrate every 6 months after locking RC parameters.
High-Precision/Optical-Grade Injection Molding Scenarios: For temperature control accuracy requirements ≤ ±0.5℃, recalibrate every 3 months.
High-Pollution/Strong Interference Workshop Scenarios: Due to complex surrounding electromagnetic environments and frequent equipment start-ups and shutdowns, recalibrate every 2 months.
II. Special Conditions Triggering Immediate Calibration
Addition of high-power frequency converters, high-frequency welding equipment, or other strong interference sources in the workshop, resulting in significant changes in on-site interference characteristics.
Replacement or rewiring of hot runner temperature measurement lines and connectors, altering signal link impedance.
Experiencing abnormal faults such as temperature reading jumps or overshooting in the temperature controller; calibrate immediately after fault repair.
During the annual comprehensive maintenance of the hot runner system, simultaneously perform calibration and verification of the RC locked parameters.
III. Core Contents of Calibration Verification
1. Measure the actual filter cutoff frequency of the currently locked RC setting, confirming a deviation of ≤10% from the set value.
Verify the attenuation of the target interference signal, confirming a suppression effect of ≥20dB.
Test the temperature measurement signal delay, confirming the total RC time constant remains ≤200ms, with no excessive sampling lag.
Compare the temperature control curves before and after calibration, confirming no overshoot, no oscillation, and that the control accuracy meets process requirements.
IV. Dynamic Adjustment Rules
If the RC parameters show no drift after three consecutive calibrations and the on-site interference environment is stable, the calibration cycle can be extended by 50%, reducing maintenance costs.
If two consecutive calibrations reveal an RC parameter drift exceeding 20%, the calibration cycle must be shortened by 50%, and potential hardware aging issues should be investigated.
