pipe welding machine
Malfunctions of electrical units
malfunction: Abnormal temperature increasing
malfunction analyzes:
1. The temperature controller switch is open
2. The sensor （pt100）is abnormal. The resistance value of4 and 5 of heating plate socket should be within 100~183Ω
3. The heating stick inside heating plate is abnormal. The resistances between 2and 3 should be within23Ω. Insulation resistance between head of heating stick and outside shell must be more than 1MΩ
4. Should the temperature controller readings be more than 300℃, which suggest he sensor may be damaged or the connection is loosen. Should the temperature controller indicate LL, which suggests the sensor have a short circuit. Should the temperature controller indicate HH, which suggests the circuit of sensor is open.
5. Correct the temperature by button located on the temperature controller.
6. The temperature fluctuate abnormally
Solutions :
1. Check the connection of contactors
2. Replace the sensor
3. Replace the heating plate
4. Replace the temperature controller
5. Refer to the methods to set the temperature
6. Check and replace the contactors if necessary
