The SEEZOL load moment indicator (LMI) for articulated boom cranes monitors parameters such as load, boom length, and angle in real time, accurately calculating actual load moment and comparing it to rated values. It provides multi-level audible and visual warnings to indicate risks, automatically shuts off dangerous movements when limits are exceeded, and implements safety interlocks. Equipped with data display, it is a key safety device for preventing overload and overturning.

This load moment indicator is easy to install and boasts an IP65 protection rating, effectively withstanding typical environmental influences. However, system malfunctions may occur due to complex external environments or human intervention. Common faults with articulated boom crane load moment indicator (LMI) are often related to sensors, wiring, or controllers. To facilitate customer self-diagnosis, the following common non-technical faults and solutions are listed below to help quickly restore equipment operation, save repair time, and improve operational efficiency.

• Abnormal Display

1. Inaccurate load display

Cause: Sensor zero point drift, surface oil, loose wiring, or miscalibration.

Solution: Clean the sensor with alcohol; tighten the terminal block plug; enter calibration mode and perform a zero point calibration. If the deviation is large, perform a full-scale calibration with a standard weight.

2. No change or jumps in arm length/angle

Cause: The arm length sensor is stuck, the angle sensor is worn, or the wiring is squeezed or broken.

Solution: Clean the sensor and add grease; use a multimeter to check the angle sensor signal; replace it if abnormal; check for damaged wiring and rewire or replace the wiring.

3. Tilt in the horizontal display (actually leveled)

Cause: The sensor is pressed by foreign objects, loosely mounted, or has internal damage.

Solution: Remove foreign objects from the bottom; tighten the fixing screws; replace the sensor after confirming damage.

• Alarm Function Failure

1. No Warning

Cause: Damaged buzzer/indicator, incorrect threshold settings, or program malfunction.

Solution: Replace the alarm component; reset the threshold to the factory default (80% of rated torque); if restarting the controller does not work, contact the manufacturer to refresh the program.

2. No Interlock After Limit Exceeded

Cause: Relay failure, shorted circuit, or communication interruption.

Solution: Check the relay energization status and replace if damaged; remove any illegal shorting wires; use a diagnostic tool to test the communication between the controller and the hydraulic valve; and repair the interface or communication cable.

• Power-On Failure

Black Screen

Cause: Power failure, damaged display, or power supply module failure.

Solution: Check the supply voltage and replace a blown fuse; test an external backup display and replace it if damaged; repair or replace the controller power supply module.

• Other Failures

1. Blurred/Flickering display: Wipe the surface and reconnect the backlight module.

2. Sudden data reset: Replace the backup battery; if frequent resets occur, replace the memory chip.

• Handling Precautions

· Before troubleshooting, lower the suspended object to the ground and disconnect the power supply to avoid misoperation.

· Do not short-circuit the interlock circuit. For complex issues, contact a professional.

· Regular maintenance can reduce malfunctions. Repeated malfunctions require inspection of the equipment for mechanical damage.