Home > Information > News

Maintenance special | injection molding machine heating system abnormal temperature rise? please quickly check these few areas!!

Sumitomo Injection Molding Machine 2025-09-30 14:07:26

The heating system of an injection molding machine is mainly used to heat the barrel and injection nozzle, allowing the plastic material to reach a molten state, and providing the necessary heat source for injection molding.

The heating system is one of the important components of an injection molding machine. The stability and accuracy of the heating system have a significant impact on production efficiency and product quality. To ensure the normal operation of the injection molding machine, the heating system requires regular inspection and maintenance.

1Temperature Screen and Content Description

No.	Screen content
1	Heating mode	Forming, clearing, and insulation modes
2	Actual value	Actual monitored temperature
3	Main setting	When the operation mode is set to [Molding], control the temperature of each section.
4	Surveillance scope	Set the monitoring range after the temperature increase in each section.
5	Actual value	Display the current measurements of each section heater.
6	Disconnected setting	Set the monitoring range for the disconnection of each section heater.
7	Heater disconnected ON	The breakpoint value can be changed after opening.

2Temperature control component composition and function

No.	Screen content
1	Temperature Control Substrate	Heater temperature control
2	Electromagnetic Contactor	Leakage protection of the main circuit of the heater
3	Solid state relay	Receive the output signal from the temperature control board to control the on/off state of the current heater.
4	Current transformer	Detect the current during heating
5	Fuse	By using a fuse, other components in the heater circuit can be protected.

No.	Screen content
6	Heater	Heat the corresponding barrel or nozzle.
7	Thermocouple	Sensor for temperature detection

3Troubleshooting Methods for Temperature Anomalies

● Confirm whether the installation positions of the heater and thermocouple are accurate.

Please tighten the terminals and plugs of the corresponding heaters and thermocouples.

● Measure the relevant components and replace defective parts. (Take the heater 220V-1450W as an example)

Use a multimeter set to AC mode to measure whether the three-phase voltage is around AC 200V.

Measure whether the solid-state relay drive voltage is DC24V and its conduction status.

Check if the fuse is blown.

Calculate the resistance based on the power marked on the heater, and measure it with a multimeter to see if it matches.

If all the above checks are fine, further investigation is required.

【Copyright and Disclaimer】The above information is collected and organized by PlastMatch. The copyright belongs to the original author. This article is reprinted for the purpose of providing more information, and it does not imply that PlastMatch endorses the views expressed in the article or guarantees its accuracy. If there are any errors in the source attribution or if your legitimate rights have been infringed, please contact us, and we will promptly correct or remove the content. If other media, websites, or individuals use the aforementioned content, they must clearly indicate the original source and origin of the work and assume legal responsibility on their own.

Maintenance special | injection molding machine heating system abnormal temperature rise? please quickly check these few areas!!

Most Popular