Common faults and solutions of high-temperature box type resistance furnace

During long-term use, high-temperature box type resistance furnaces may encounter some common faults. Here are some common faults and their solutions:

1. Abnormal temperature indication (over temperature, over low)
Reason for malfunction:
The thermocouple is damaged.
Heating elements (such as electric furnace wires) are broken or loose.
resolvent:
Check the thermocouple and repair or replace it if it is damaged.
Check the heating element and tighten or replace it if there is any breakage or looseness.

2. The resistance wire part is not heated
Reason for malfunction:
The solid-state relay is damaged.
Loose terminals or broken fuses.
resolvent:
Carefully inspect the cause of the circuit damage and replace the damaged parts of the solid-state relay.
Tighten the terminal, replace the fuse, and connect the resistance wire.

3. Not heating up or heating up slowly
Reason for malfunction:
Power supply failure, such as low voltage and unbalanced three-phase current.
The ammeter does not display, it may be due to a broken circuit in the electric furnace wire.
The controller is not working, which may be due to internal switch, fuse or furnace door travel switch malfunction.
The power of the electric heating element decreases, the resistance value does not meet the requirements, or there is a short circuit phenomenon.
Too much material is loaded into the furnace, resulting in poor performance of the insulation screen or lining.
resolvent:
Check the voltage of the power grid to ensure normal power supply.
Use a multimeter to check if the electric furnace wire is broken and replace it with an electric furnace wire of the same specification.
Inspect the switches, fuses, and travel switches inside the controller to ensure proper operation of the controller.
Replace the electric heating element with insufficient power or damage, adjust the resistance value and connection method of the electric heating element.
Reduce the loading amount, replace the insulation layer, or decrease the heat dissipation.

4. Abnormal lifting of furnace door
Reason for malfunction:
Shift or damage of the motor travel switch.
resolvent:
Check the proximity switch. If the travel switch shifts, repair it. If it is damaged, replace it.

5.Trip fault
Reason for malfunction:
The switch is damaged.
The resistance furnace is leaking electricity, and the protective switch is functioning.
Overload of switch current.
resolvent:
Replace the damaged switch.
Check if there is any leakage in the resistance furnace and repair it.
Check and adjust the circuit load to avoid current overload.

6. Poor temperature uniformity
Reason for malfunction:
Unreasonable power allocation.
Uneven distribution or open circuit of electric heating elements.
The furnace has poor sealing and excessive local heat dissipation.
resolvent:
Recalculate and improve power configuration.
Replace the disconnected electric heating element and adjust the distribution of the electric heating element.
Check the sealing condition of the furnace and eliminate any factors that may cause poor sealing.

7. Low or unstable temperature display value
Reason for malfunction:
The reference temperature of the thermocouple is too high or there is electrode leakage.
The compensation wire does not match the thermocouple or its polarity is reversed.
Poor contact or constantly changing position of thermocouple electrodes.
resolvent:
Check the reference temperature of the thermocouple and ensure it meets the requirements, inspect the electrode connection, and replace the thermocouple with leakage current.
Replace the matching compensation wire and connect the polarity correctly.
Reconnect the thermocouple and secure its position.

In summary, common faults in high-temperature box type resistance furnaces involve multiple aspects such as temperature indication, heating elements, controllers, furnace door lifting, circuit protection, and temperature uniformity. By carefully examining the cause of the malfunction and taking corresponding solutions, the normal operation of the high-temperature box type resistance furnace and the smooth progress of the experiment can be ensured.