1、 Circuit malfunction

1. The crane cannot start normally

When the crane cannot be started normally, the first thing to check is whether the power supply of the electrical control box and motor is connected, and whether the main circuit breaker is normal.

If none of the above problems exist, it is possible that the contactor has malfunctioned. You can first press the contactor by hand to see if it works. If it still doesn't work, the contactor needs to be replaced.

2. Abnormal speed of crane motor

When the speed of the crane motor is too fast or too slow, it may be due to a fault in the motor itself or a problem with the electrical control system. You can first check if the connection between the motor and the electrical control system is normal, and then check if there is a short circuit or open circuit in the motor winding.

3. Crane frequency converter malfunction

When using a frequency converter for speed regulation of a crane, it is possible for the frequency converter to malfunction. At this point, it is necessary to check whether the connection between the frequency converter and the motor is normal, whether there are short circuits or other issues, and also to check the fault codes of the frequency converter itself.

2、 Mechanical malfunction

1. Damage to the crane wire rope

After prolonged use, crane wire ropes are prone to wear and tear, breakage, and other issues. At this point, it is necessary to replace the steel wire rope in a timely manner.

2. Crane brake failure

The crane brake is one of the important components of the crane. If the brake fails, it may cause serious accidents such as the sliding of the loaded object or the accidental operation of the crane. At this time, it is necessary to promptly check whether the brake connection is loose, whether the brake spring is normal, whether the brake friction plate is worn, etc., and replace or repair them in a timely manner.

3. Abnormal transmission mechanism of crane

The transmission mechanism of a crane includes components such as reducers, gears, and bearings, which are prone to damage, aging, and other issues after frequent use and need to be inspected and replaced in a timely manner.

3、 Security malfunction

1. Overloading of crane

Overloading of cranes is a very dangerous situation, which may lead to dangerous accidents such as wire rope breakage and flying off. Therefore, before using the crane, it is necessary to operate it according to the specified load capacity to avoid overloading.

2. Crane cable breakage

Crane cable breakage is a common fault that may cause the lifting object to fall, resulting in personal injury or property damage. Therefore, when using a crane, it is essential to ensure the quality and integrity of the cables, and to replace aged and worn cables in a timely manner.