Various problems will happen if the electric chain hoist is utilized inappropriately or for an extended period of time. The following typical failures, their causes, and possible solutions have been sorted out for you.
List of Most Common Failures in Electric Hoist
When braking, the sliding distance is greater than what is required
Long-term usage of the electric chain hoist causes the brake ring to wear down too quickly, lowering the pressure on the brake spring and the braking power. Change the brake ring or readjust the brake bolt as a fix.
The heavy object rises to mid-air and cannot continue after stopping
To start, determine if the voltage output is too inadequate or the variation is too great. In such a case, you should merely wait for the voltage to stabilize when starting; on the other hand, you should pay close attention to the three-phase motor’s loss of phase when it is operating because it does not continue after stopping. Consider the number of power stages in this situation.
Can’t stop, or can’t get to the maximum, and yet won’t stop
Usually, the contact welding of the contactor takes place in this sort of situation. When the stop switch is depressed, the motor is activated, the interface of the converter cannot be removed, and the hoist is prevented from stopping.
If the limiter malfunctions, the hoist is also prevented from stopping. parking. In this situation, shut off the power right away to halt the hoist. Inspect the limiter or contractor after parking. It needs to be repaired if it is heavily damaged and can’t be fixed.
If the circuit isn’t really faulty, and the motor cannot start
Even though there is no circuit issue, the motor still won’t start throughout cold weather construction, particularly after snow. The brake ring freezes to death, which is the cause. The motor will quickly catch fire if forced to run at this moment. It can be fixed by prying the motor away with a crowbar after opening the motor cover.
The wire rope or hoisting chain cannot be raised or lowered
The stroke limiter needs a replacement because it is faulty and must be repaired.
The electric hoist motor’s temperature rise is too excessive
Check to see if the HITACHI electric hoist is overburdened first. The motor will become hot if it is overloaded. An ongoing overload will destroy the motor. The motor still gets hot even though it is not overworked.
Look for damage to the motor bearing. Verify that the motor is operating in accordance with the required functional system. This is another reason.
One of the causes of the motor’s heating is the user’s tight adherence to the motor’s functioning system. There is a substantial amount of friction when the motor is operating because the brake spacing is too tiny and not fully disconnected.
Additionally, friction heat is comparable to an increased capacity that intensifies current, decreases motor speed, and produces heat. Stop functioning now, then start again. Maintain the brake gap.
The maintenance department of electric chain hoists can increase the effectiveness of maintenance by knowing where to start inspections when coping with problems thanks to the assessment of typical failures and solutions of electric chain hoists.
At MIT Hoist, we manufacture and supply a wide range of material handling equipment and machinery.
Get Assistance with Your Electric Chain Hoist Problems at MIT Hoist
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