What Are Maintenance Taboos of Hot Runner Temperature Control Systems

Many informal operation habits may shorten the service life of accessories, cause various electrical faults and temperature control failures, and directly harm heating components, thermocouple sensors, and intelligent control hosts when hot runner temperature control systems are used and maintained on a daily basis. By making common maintenance taboos clear, workshop operation standards can be standardized and the entire set of temperature control equipment may be properly protected.

Random wiring and mixed connections of thermocouple signal lines are the first big taboo. Different kinds of hot runner thermocouples differ in their exclusive signal line characteristics and positive and negative polarity. The temperature controller's internal signal acquisition modules may potentially burn out as a result of random reversing wiring and the combined use of K-type and J-type thermocouple lines, which would immediately cause severely distorted temperature measurement data and temperature display deviation. Additionally, thermocouple high-temperature cables cannot be spliced or lengthened on-site. Unstable temperature feedback can be caused by inadequate contact and signal interference at random joints.

Second, disassembling and reassembling thermocouples and heating components in a live high-temperature state is prohibited. The interior metal components are in a state of thermal expansion when the hot runner is operating at a high temperature. Forced disassembly can result in permanent damage to fitting surfaces, thread slippage of heating rings, deformation of thermocouple probes, and scald safety mishaps. To guaranty the correctness of the assembly and the integrity of the accessories, all maintenance, repair, and disassembly procedures must be performed after the power has completely cooled to room temperature.

Increasing the set temperature mindlessly to address material feeding issues is frowned upon. Many operators immediately increase the hot runner temperature when they experience uneven filling and slow glue feeding without first determining the true cause. Thermal degradation of raw materials, carbon deposition, and severe aging burnout of heaters and thermocouples are all easily caused by blind over-temperature regulation. Instead of depending on excessive temperature for improvement, the proper approach is to first determine whether there are flow channel blockages, thermocouple temperature deviation, and process parameter mismatches, and then address issues in a targeted manner.

Temperature control equipment must be cleaned of dust and oil residue. Plastic dust, cooling water mist, and mold oil filth can easily build up on the surfaces of temperature controller hosts, wiring terminals, and thermocouple plugs over an extended period of time. Poor contact, circuit short circuits, and signal blockages brought on by these contaminants will result in frequent false alarms and control failure. Dry maintenance and routine surface cleaning need to be done correctly. Furthermore, it is prohibited to randomly swap out different power heaters and thermocouples with different specifications without matching parameters. The initial steady temperature control logic will be broken by mismatched accessories, leading to a number of uncontrollable production failures. Temperature control system failure rates can be significantly decreased and long-term steady and effective output can be maintained by adhering to maintenance operation taboos.333