The wiring method for a hot runner temperature control box depends mainly on its temperature control card type and connector configuration. Common wiring methods are as follows:
Typical Wiring Points for a Temperature Control Box: Hot runner temperature control boxes typically use plug-in temperature control cards, with each group independently controlling one heating circuit. Wiring mainly includes three categories: power input, heater output, and temperature sensor input.
Heater Output Terminal: Used to connect the hot runner heating rod.
Temperature Sensor Input Terminal: Used to connect a K-type or J-type thermocouple.
Power Input Terminal: Provides power to the temperature control card (usually 220V AC or 380V AC, depending on whether it's a single or multiple groups). Two Common Wiring Methods
According to data released by manufacturer SINCO in March 2026,
11. There are two main wiring methods for a group of temperature control boxes:
Independent Group Wiring (1-12 for heaters, 13-24 for temperature sensors)
Suitable for 12-point temperature control boxes, each group corresponds to 2 points (1 heater + 1 temperature sensor).
For example: Group 1: Heating terminal 1, temperature sensor terminal 13; Group 2: Heating terminal 2, temperature sensor terminal 14, and so on.
Double-Point Multiplexing Wiring (1, 2 for heaters, 3, 4 for temperature sensors, and so on)
Each group uses two consecutive terminal pairs:
Group 1: Terminals 1, 2 → Heater output
Group 1: Terminals 3, 4 → Temperature sensor input
Group 2: Terminals 5, 6 → Heater output
Group 2: Terminals 7, 8 → Temperature sensor input
...and so on.
⚠️ Note: Specific wiring methods must be based on the equipment manual or the wiring diagram on the back of the temperature control card. Different brands may have different wiring methods.
General Wiring Principles (Applicable to most temperature control boxes)
Power Supply Wiring:
Single Group: L (Live), N (Neutral), PE (Ground) connect to 220V AC
Multiple Groups: L1/L2/L3 (Three-phase Live), N (Neutral), PE (Ground) connect to 380V AC
Heater Wiring:
Connect to the SSR (Solid State Relay) output terminal or the bidirectional thyristor output terminal of the temperature control card (usually marked "H+", "H-", or "OUT").
Thermocouple Wiring:
K-type/J-type thermocouple: Red wire connects to "+" (positive), blue or black wire connects to "-" (negative). For three-wire heating resistors (less commonly used in hot runner systems), connect two wires of the same color to the "-" terminal and the other to the "+" terminal.
Relay output (for alarm or indication):
"General" is the common terminal, "High" is normally closed (NC), and "Low" is normally open (NO).
Operating Recommendations:
Confirm the temperature control card model (e.g., HOTWIN, SINCO, etc.).
Refer to the wiring diagram or instruction manual included with the package.
Power off the device before operation. Ensure wiring is secure and avoid short circuits.
For industrial applications, it is recommended that a certified electrician operate the device in accordance with electrical safety regulations.
