Troubleshooting Guillotine Shear Faults: Expert Tips

The main motor cannot be started

Causes:

• Emergency stop switch off
• 1QF1 switch off
• Lack of phase
• Hydraulic oil cannot be extracted

Solutions:

• Turn on the emergency stop switch
• Close 1QF1 switch
• Check the circuit
• Check whether the filter is blocked

NCRDY is not displayed

Causes

• The CNC system start switch is not activated
• The X-axis, shear angle, and clearance are not properly set

Solutions

• Activate the NC system start switch
• Press the hand wheel control key once and move the cursor to the relevant positions to check which of X, A, and G are not properly set, and analyze the cause.

The X-axis does not work properly

Causes:

• Servo drive alarm
• 1QF3 not closed
• Power line, encoder line or servo motor failure

Solutions:

• Check the cause of the alarm (refer to remarks)
• Close 1QF3
• Check the wiring.

The size of X-axis is 5mm and 10mm larger or smaller than the normal state

Causes:

Inaccurate position finding while returning to the reference point.

Solutions:

• Shutdown and restart.
• Move the reference point sensor 1-2mm or adjust the sensing distance of the sensor.

The blanking size is different from the actual programmed size

Causes:

• Caused by manual feeding
• Rear stop movement of machine tool

Solutions:

• Try feeding and shearing again
• Adjust the X reference point

The machine cannot go down

Causes:

• Down valve stuck
• No signal to downstream valve
• No main pressure

Solutions:

• Check the down valve
• Check the control circuit
• Check the main pressure valve

No main pressure

Causes:

• Main motor not started.
• The main pressure valve is damaged or inoperative.
• PLC control circuit failure.

Solutions:

• Start the main motor.
• Replace or clean the main pressure valve and check the control valve coil circuit.
• Check the PLC controller.

The slider does not drop after the foot switch is depressed

Causes

• The controller has no “ncrdy” signal
• Loose line
• PLC no signal output

Solutions

• Check that there is no “ncrdy” reason
• Check and connect relevant circuits according to the electrical schematic diagram
• Check PLC controller