Temperature Control Principle of Temperature Control Cabinet

A temperature control cabinet is a device that continuously maintains the required temperature value. It mainly detects the temperature of heating elements through an intelligent computer chip (MCU) inside the meter core, then processes the data internally through the intelligent computer and outputs a proportional current value to achieve temperature control. The accuracy and stability of temperature control mainly depend on the following important factors:

1》 Temperature Measurement: Sampling cycle parameters and data filtering processing determine the temperature, while temperature compensation of the measurement circuit determines the temperature measurement accuracy;

2》 PID Control: Adjusts the proportional output current, with relevant parameters including proportional band, integral time, and derivative time; 

3》 PIDD Control: Controls through phase angle, with relevant parameters including proportional band, integral time, and derivative time;

4》 Automatic Adjustment: Automatically provides the function of dominant factors by analyzing the capacitance of the heating wire and the thermal constant of the mold (it can accurately control the temperature when latent heat factors and unpredictable heat dissipation factors affect the temperature).

5》 Output Mode: Can be changed according to the environment

PWM (PIDD) Mode: Can achieve precise temperature control, but the power supply noise is much larger than that of SSR mode. SR (PID) Mode: Has small current noise, but its ability to control specific temperatures is worse than PWM mode.

Function Description

1》 Adopts FUZZY PIDD control technology, which can automatically adapt to any heating model without tuning PID parameters, greatly improving work efficiency

2》 Automatic ambient temperature linear compensation makes the temperature value of the controller more accurate

3》 Automatic cold junction compensation of thermocouple avoids relative errors caused by ambient temperature changes

4》 Automatic control function for thermocouple (temperature sensing wire) disconnection: If the temperature sensing wire is disconnected under constant temperature condition, the temperature controller will automatically memorize the constant temperature parameters after alarming, then continue to control. The hot runner of the mold can be repaired after product production is completed, thus avoiding losses caused by production stop due to thermocouple disconnection.

5》 Alarm Protection Functions:

Alarm for missing neutral wire or incorrect power wire connection          

Alarm for hot runner power wire short circuit                 

Alarm for hot runner temperature sensing wire short circuit

Alarm for hot runner power wire open circuit     

Alarm for hot runner temperature sensing wire disconnection

Alarm for incorrect connection position of hot runner power wire and temperature sensing wire                

Alarm for reverse connection of temperature sensing wire positive and negative poles

High temperature alarm

Low temperature alarm

Alarm for thyristor damage

Alarm for excessive power

Alarm for fuse damage

Alarm Information Comparison Table

Fault Information	Fault Cause
	Power supply error
	Heating wire short circuit
	Incorrect connection of heating wire and temperature sensing wire
	Heating wire open circuit
	Temperature sensing wire open circuit
	Abnormal temperature measurement
	Reverse connection of temperature sensing wire
	Thyristor damage
	Test loop break
	Current overload
	Fuse F1 damage
	Fuse F2 damage

Technical Parameter Table

Factory Settings of Functional Parameters