Quick Troubleshooting of Electrical Failures in Tensile Hydraulic Press
Quick Troubleshooting of Electrical Failures in Tensile Hydraulic Press:
I. Inspection of Buttons: First, disconnect the power supply. Use a multimeter in resistance mode to check for poor contact or inadequate closure of the contacts at both ends of the buttons. If there is poor closure, replace buttons of the same model. Buttons on the tensile hydraulic press are prone to frequent issues and should be the first item to check.
II. Inspection of Contactors: Contactors control the start/stop and forward/reverse feed of the machine. Their opening and closing are frequent, and the accumulation of dust or iron filings can lead to contact erosion and poor contact. Check if the self-locking point of the contactor has poor contact. If it is difficult to determine visually, two methods can be used for testing:
- 1.Apply power and operate the spindle motor of the tensile hydraulic press. If the contactor can engage and the machine automatically stops after releasing the button, it indicates poor contact at the self-locking point.
- 2.Use a multimeter to open the arc cover of the contactor with the power off. Use a screwdriver handle to manually make the contactor perform a closing motion. Check if the self-locking point of the contactor can close. If the closure is not good, use fine sandpaper to polish its auxiliary contacts or replace the contactor with the same model.
III. Inspection of Transformer: Using a multimeter with the hydraulic press disconnected from the power supply, test the resistance of the primary and secondary coils of the control transformer. If the circuit is burnt or the resistance is low, it indicates that the control transformer is damaged and needs replacement with a transformer of the same specifications. If it is challenging to determine whether the transformer is damaged, apply power to measure the transformer voltage. The primary voltage should be 380V, and the secondary control voltage should be 127V or 110V. If there is no voltage or the voltage is abnormal, it indicates that the transformer is burnt. If the transformer leads are burnt or have poor contact, take appropriate measures to continue use. If the winding is burnt, replace the transformer with the same model.