There is no current in the heat treatment vacuum furnace

09-11-2025       Author: KJ technology

The lack of current in the heat treatment vacuum furnace may be caused by the temperature control instrument not outputting a signal, power regulator failure, circuit connection problems, damaged heating elements, or control system failures. The following is a specific analysis and solution:

1. The temperature control instrument is not outputting a signal

Possible reasons: Hardware abnormalities in the internal circuit board of the temperature control instrument, abnormal control parameters, or poor contact in the output module.

Inspection method:

Observe the temperature control instrument display and confirm if there is an output signal indication.

Check the instrument parameter settings to ensure that the output module is displaying properly.

Measure the control signal current at the input of the power controller to confirm the presence of an output signal.

Solution:

If the hardware of the internal circuit board of the instrument is abnormal, a new temperature control instrument needs to be replaced.

If the control parameters are abnormal, they need to be recalibrated or adjusted.

If the output module has poor contact, it is necessary to tighten the wiring terminals or replace the output module.

2. Power regulator malfunction

Possible reasons: The startup conditions of the power regulator are not met, the power regulator is damaged, or the control mode is set incorrectly.

Inspection method:

Check the control mode of the power regulator to confirm if the starting conditions are met (such as connecting terminals K1 and K3 in automatic control mode).

Measure the input voltage and current of the power regulator to confirm if they are normal.

Disconnect the load for testing and observe whether the power regulator has voltage output.

Solution:

If the starting conditions of the power regulator are not met, the control mode needs to be adjusted or the corresponding terminal needs to be connected.

If the power regulator is damaged, it needs to be replaced with a new one.

If the control mode is set incorrectly, the control mode needs to be reset.

3. Line connection issues

Possible reasons: Loose, oxidized, or disconnected wiring connections.

Inspection method:

Visually inspect whether the wiring connections are securely fastened without any looseness.

Measure the resistance of the circuit with a multimeter to confirm if there is an open or short circuit.

Solution:

Tighten the circuit connection terminals to ensure good contact.

Remove the oxide layer from the circuit and restore its conductivity.

Repair or replace broken or short circuited circuits.

4. Heating element damaged

Possible reasons: Heating element aging, breakage, or poor contact.

Inspection method:

Measure the resistance value of the heating element and confirm whether it is consistent with the nominal value.

Observe the appearance of the heating element for any signs of breakage or erosion.

Solution:

Replace the heating element with the same specifications to ensure normal heating performance.

Adjust the spacing or increase the number of heating elements to ensure even distribution of heat.

5. Control system malfunction

Possible reasons: Abnormal control system software, hardware damage, or incorrect parameter settings.

Inspection method:

Observe the control system display and confirm if there are any abnormal alarms or error prompts.

Check the hardware connections of the control system to confirm if there is any looseness or damage.

Check the parameter settings of the control system to ensure they are consistent with the process requirements.

Solution:

Restart the control system software, restore default settings or reload the program.

Tighten or replace the hardware connection components of the control system to ensure good contact.

Adjust the parameter settings of the control system to ensure consistency with the process requirements.