Common faults and troubleshooting of the guillotine shear

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 start switch of CNC system is not started
• X-axis, shear angle and clearance are not in place

Solutions

• Press the NC system start switch
• Press the hand wheel control key once, move the cursor to relevant positions respectively, check which of X, a and G is not in place, and analyze the cause.

The X-axis does not work properly #

Causes

• Servo drive alarm
• 1QF3 not closed
• The power line or encoder line or servo motor fails

Solutions

• Check the cause of the alarm (see remarks)
• Close 1QF3
• Check the wiring

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

Causes

The position finding is not accurate when returning to the reference point.

Solutions

• Shut down 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 artificial feeding
• Rear stop movement of machine tool

Solutions

• Refeeding and shearing
• Corrected X reference point

The machine cannot go down #

Causes

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

Solutions

• Check 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 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