What Are the Common Faults and Troubleshooting Methods of The Mixing Plant Control Cabinet?
The mixing plant control system is the central nervous system of the entire equipment, responsible for the start, stop, speed regulation and safety protection of the equipment. Depending on the different scales and needs of the concrete mixing plant, the types of control cabinets are also different, such as fully automatic control systems, PLC automatic control cabinets, centralized control cabinets, etc.
The mixing plant control system may have some faults during operation. Among them, the common faults of the mixing plant control cabinet and their troubleshooting methods mainly include the following aspects:
I. Inability to Start the Mixing Host Motor
Fault Phenomenon: The mixing host motor has difficulty starting or emits abnormal sounds during startup.
Fault Causes:
- Power supply to the grid is phase-lost or voltage is abnormal.
- The contact points of the circuit breaker are poor, resulting in phase-loss.
- Faults within the motor itself (this situation is rare).
Troubleshooting Methods:
- Check the power supply voltage at the motor terminal box to ensure it is normal and not phase-lost.
- Check the output power supply voltage of the circuit breaker in the motor control cabinet and the grid power supply for normality.
- If the motor itself is faulty, contact professional maintenance personnel for repair or replacement.
II. Frequent Activation of the Air Compressor
Fault Phenomenon: The air compressor activates frequently, reducing its service life.
Fault Causes:
- Air leakage due to poor sealing of air pipe connectors.
- Damage to the air compressor's pressure relay.
Troubleshooting Methods:
- Inspect the air path for leaks, especially the storage tank and various connections. Repair any leaks found promptly.
- Adjust or replace the pressure relay to ensure its normal operation.
III. Inability to Open/Close the Mixing Host's Discharge Door
Fault Phenomenon: The discharge door of the mixing host cannot be opened or closed normally.
Fault Causes:
- The motor driving the hydraulic pump is not energized, and the hydraulic system is not functioning properly.
- The solenoid valve coil is not energized, or the solenoid valve spool is stuck.
- Oil leakage (external or internal) in the discharge door cylinder, resulting in insufficient pressure.
- Issues with the control circuit for the discharge door.
Troubleshooting Methods:
- Check if the discharge door cannot be opened and closed due to mechanical failures, and repair mechanical failures promptly.
- Check if the hydraulic system is functioning normally and ensure the motor is running smoothly.
- Check if the solenoid valve coil is energized and if the solenoid valve spool is stuck. Repair or replace the solenoid valve promptly.
- Check if there are issues with the control circuit and repair circuit faults promptly.
IV. Control Section Faults
Fault Phenomenon: Abnormalities in the mixing plant control system, such as the air compressor not starting, the supply air system pressure not reaching the required level, the mixing host's maintenance protection switch not being engaged, the emergency stop switch on the operation panel not being reset, etc.
Fault Causes:
- The air compressor has not started or the supply air system pressure has not reached the required level.
- The maintenance protection switch of the mixing host is not engaged.
- The emergency stop switch on the operation panel is not reset.
Troubleshooting Methods:
- Check if the air compressor has started and if the supply air system pressure has reached the required level. Repair air compressor faults or adjust the supply air system pressure promptly.
- Ensure that the maintenance protection switch of the mixing host is engaged.
- Reset the emergency stop switch on the operation panel.
V. Other Faults
Fault Phenomenon: Such as power supply faults, communication faults, etc.
Troubleshooting Methods:
- Check if the power supply is normal and repair power supply faults promptly.
- Check if the communication line is normal and repair communication faults promptly.
In summary, the common faults and troubleshooting methods of mixing plant control cabinets need to comprehensively consider multiple aspects, including power supply, motors, air compressors, hydraulic systems, control circuits, etc. When troubleshooting, carefully analyze the fault causes and adopt corresponding troubleshooting methods to ensure the normal operation of the mixing plant control system. At the same time, regular maintenance and servicing of the mixing plant control cabinet can reduce the probability of faults and extend the equipment's service life.