As a key equipment for precision machining of saw blade edges, the saw blade forming and grinding machine can be shut down directly due to power failure, which affects the progress and quality of saw blade processing. This type of malfunction is mainly caused by power supply, circuit connection, or damage to core components. It is necessary to follow the principle of "from outside to inside, from simple to complex" to gradually locate the problem and take targeted measures to quickly restore equipment power supply.
1、 Prioritize troubleshooting external power sources and power supply circuits: rapid handling of basic faults
Abnormal external power supply is the most common cause of power failure, and it is necessary to first investigate the external power supply link of the equipment:
Firstly, check the power supply status of the power grid: observe whether other equipment in the workshop is powered on normally. If there is a large-scale power outage, contact the power department to confirm the power grid fault; If only the grinding machine is powered off, it is necessary to check whether there is any physical damage to the equipment power cord (such as cable breakage or plug damage). The damaged area should be temporarily wrapped with insulating tape (the same specification power cord needs to be replaced for a long time), and the plug should be unplugged to ensure that the plug is in close contact with the socket - in some cases, oxidation of the plug or loosening of the socket can cause power interruption.
Next, check the overload protection device: saw blade forming and grinding machines are usually equipped with overload protectors (such as air switches, fuses). If the equipment triggers protection due to short circuits or overload, the protector will automatically disconnect. It is necessary to open the equipment distribution box and check whether the air switch has tripped. After tripping, it is necessary to first investigate whether there is a short circuit hazard (such as line adhesion), confirm safety, and then reset the switch; If the fuse is blown, it is necessary to replace it with a fuse of the same specification (copper wire or other materials should not be used as a substitute to avoid losing its protective function). Before replacement, the cause of the fuse should be confirmed to prevent it from melting again.
2、 Thoroughly inspect the internal circuit connections of the equipment: targeted treatment for poor contact
After ruling out external power supply issues, it is necessary to disassemble the equipment casing (power off operation to avoid electric shock) and check whether the internal circuit connections are abnormal:
Key wiring terminals to be inspected: The power input terminals, contactor terminals, and motor terminals inside the equipment are prone to loosening due to vibration. Use a screwdriver to check the terminal bolts one by one. If any looseness is found, tighten them again. At the same time, clean the oxide layer on the surface of the terminal (which can be lightly sanded with fine sandpaper) to ensure good contact between the wire and the terminal - the oxide layer will increase the contact resistance, causing poor power supply or even power failure.
Next, check the cables and connectors: check whether the internal cables are aged or damaged, especially the cables that are frequently moved (such as those connected to grinding heads). Insulated sleeves should be used to wrap or replace the cables at the aged and damaged areas; Check the plug and socket connectors (such as the connector between the control board and the motor). If there is any looseness, it needs to be plugged and unplugged again. If necessary, apply conductive paste to enhance conductivity and avoid power failure due to poor contact.
3、 Troubleshooting core electrical components: repair and replacement of damaged components
If there are no abnormalities in the external power supply and internal circuit, further inspection is needed to determine if the core electrical components of the equipment are damaged
Firstly, check the control board and button switch: after powering on, use a multimeter to measure the input voltage of the control board. If the voltage is normal but there is no output voltage, it may be that the control board is damaged and the manufacturer needs to be contacted to replace it with a control board of the same model; Check the button switches (such as power switch and emergency stop switch) on the equipment operation panel. If the emergency stop switch is pressed incorrectly, it will cut off the power and needs to be reset by rotating clockwise. If other button switches are stuck or have poor contact, they need to be disassembled and cleaned of internal impurities or replaced.
Next, check the motor and contactor: If the control board output is normal but the motor does not start, measure the resistance of the motor winding. If the resistance value is infinite (open circuit) or close to zero (short circuit), it indicates that the motor is damaged and needs to be replaced with a motor of the same power; Check if the contactor coil is energized. If there is no voltage on the coil, check the control circuit. If there is voltage on the coil but the contactor does not engage, replace the contactor. Contact burnout and coil damage are common causes of motor power failure.
After troubleshooting, it is necessary to first conduct a no-load power on test: after connecting the power supply, observe whether the equipment indicator light is on normally and whether there is any abnormal noise from each component. After confirming that there are no problems, perform a saw blade grinding test to ensure stable operation of the equipment. In daily maintenance, it is necessary to regularly clean the dust inside the equipment and check the circuit connection status to avoid power failure caused by dust accumulation and component aging.