Based on your previous understanding that reversing the positive and negative terminals of hot runner temperature sensing wires can cause reverse drift, overheating, and other faults, and that this can be quickly diagnosed through visual inspection and heating verification, the repair operation after reversal is simple and efficient, requiring no replacement of any parts:
Safe Operation After Power Disconnection: First, disconnect the power supply to the hot runner temperature control box to avoid short circuits and electric shock risks from operating with the power on.
Verify and Reconnect: Locate the positive and negative terminals of the temperature sensing wires. Swap the two reversed wires, strictly following the specification of "positive terminal to the positive terminal of the temperature controller, negative terminal to the negative terminal of the temperature controller," and tighten the terminals.
Power-On Verification: After reconnecting the power, slightly increase the temperature of the hot runner. Observe that the temperature displayed on the temperature controller rises synchronously with the heating, without reverse drift. The repair is complete.
Secondary verification and confirmation: After the hot runner reaches the set operating temperature, use a handheld temperature gun to measure the actual temperature of the runner. Confirm that the deviation between the displayed value and the measured value is within the normal range of ±2℃, thus completely eliminating potential hazards.
The entire repair process takes only about 10 minutes, requires no disassembly of the hot runner, and incurs no additional material costs.
