FAQs

Injection Moulding Machine

  1. Motor Does Not Start ?
    • Low Voltage.
    • Over-load relay trip.
    • Fuse of Motor Protection off.
    • Fuse of control voltage blown off.
    • Loose contract at motor ON push button.
    • Loose contact at contactor.
    • Loose contact at circuit connections.
    • Defective coil of contactor.
  2. Motor starts but stops when push button released ?
    • Self holding circuit loose.
    • Check connections of self holding circuit.
    • Poor contact of contactor. Clean contacts of contactor.
  3. Heater band failure ?
    • Heater band not fixed securely.
    • Fix the heater band in proper position.
    • Tighten the clamping screw of heater band.
    • Suddenly increase in voltage too high Check voltage (220 V 240V)
    • Any joints cuts with heater band. Check continuity. Join the joints properly.
  4. Mold does not close ?
    • Check out put signal of 'MOLD CLOSE' (in HAND operation)
    • Defect of loose connection of solenoid valve coil.
    • Check solenoid valve coil connection if loose, tightened it. Check continuity of solenoid valve coil if burnout replace it. Disconnect solenoid valve coil. Join the Connection.
    • Check the circuit according to the electrical circuit diagram.
    • Safety gate open (in semi/fully automatic operation)
    • Close the safety gate properly.
    • Defective cycle timer (in semi/fully automatic operation) Replace cycle timer.
    • Low hydraulic pressure. Increase to required level.
  5. Mould does not open ?
    • Check out put signal of 'MOLD OPEN' (in HAND operation)
    • Defect of loose connection of solenoid valve coil.
    • Poor contact or loose connection of proxy switch.( in semi /fully automatic operation)
    • Join the connection properly. Replace if necessary.
    • Increase hydraulic pressure (in all operation)
    • Check hydraulic pressure if it is below the required pressure, increase the hydraulic pressure.
    • Defect or loose connection of solenoid valve coil. Defective coil of solenoid valve.
  6. Injection not effected ?
    • Check out put signal of 'INJECTION' (in HAND operation)
    • Check circuit according to circuit diagram.
    • Defect or loose connection of solenoid valve coil. Defective coil of solenoid valve.
    • Join the connection properly. If Coil is defective than replace.
    • Low temperature (In all operation) Check heater connection and condition. Increase temperature as per requirement. Replace the better heater band if necessary.
    • Defective torpido. Replace if necessary.
    • Injection pressure is too low (in all operation) Check injection pressure. Increase injection pressure as per requirement.
    • For PLC based control refer operator instructional manual.
  7. Screw does not rotate or refilling is not effected ?
    • Check out put signal of 'REFILLING' (in HAND operation)
    • Check circuit according to circuit diagram.
    • Defect or loose connection of solenoid valve coil. Defective coil of solenoid valve.
    • Join the connection properly. If Coil is defective than replace.
    • Low temperature (In all operation) Check heater connection and condition. Increase temperature as per requirement.
    • Back pressure too high Decrease backpressure as per requirement.
    • Loose contact, connection or defective proxy/limit switch. Check continuity. Join the connection properly. Adjust proxy/limit switch . Replace proxy/limit switch if required.
    • For PLC based controller refer the operator instructional manual.
  8. Temperature control out of order ?
    • Reading of temperature value too high or too low than heated portion. Check loose connection of thermocouple. Join connection properly Thermocouple seats not proper. Fix thermocouple with proper spring tension. Thermocouple connection (negative and positive) are open or short. Join the connection of negative and positive properly. Defective thermocouple, replace with new thermocouple, if necessary.
    • Check the OUT PUT SIGNAL of heating.
    • Check the loose contact or connection of heating contactor. Replace the contact or contactor if necessary.