Troubleshooting and Solutions for the Fault: The Material Storage Solenoid Valve Indicator Light of Horizontal Injection Molding Machine Is On, but the Screw Does Not Store Material
In after-sales maintenance of horizontal injection molding machines, a typical fault is frequently encountered: when the material charging (melting) action is triggered, the indicator light of the material charging (plasticizing) solenoid valve lights up normally and the PLC output signal is valid, yet the screw fails to rotate and no charging back-off action occurs. A lit indicator only means the solenoid coil receives an electrical signal; it does not guarantee the hydraulic circuit has shifted properly or built up driving pressure. Following the troubleshooting principle of **from simple to complex, external checks before internal disassembly**, this article sorts out all potential fault causes, judgment methods and corresponding solutions to help on-site technicians and workshop maintenance personnel locate faults quickly and carry out maintenance safely.