Electric hoist common troubleshooting questions

1, press the start switch  Rope hoist  does not work
Mainly because the  rope hoist  did not turn rated working voltage, which led to not work, generally have the following three conditions:
(1) is not energized. Power supply system for electric hoist power transmission, usually with test pencil tests, such as no power transmission, power transmission, etc. after work.
(2) phase. Hoist the main, the control circuit of electrical damage, the line is disconnected or bad, but also make hoist motor phase does not work, this is the case, the need to repair the main, the control loop, maintenance, in order to prevent the main, the control loop to give Three-phase motor power phase while burning motor, or a sudden was electric hoist motor running, cause harm, be sure to hoist the motor is disconnected from the power line, only to master, control circuit power transmission, and then move the start and stop switch Check electrical and circuit analysis and control of the work, to have electrical problems or line repair or replacement, when the confirmation Lord, control circuit trouble, before re-commissioning.
(3) voltage is low. Hoist motor terminal voltage is lower than the rated voltage of more than 10%, motor starting torque is too small, so do not move goods  lift hoist   and can not work, check with a multimeter or voltage meter and other measuring motor input voltage.
2,  wire rope hoist  abnormal noise when running
Many electric hoist failure, such as control of electrical appliances, motor or reducer failures, often accompanied by abnormal noise, the noise level of the position and not with the cause of the malfunction and sound different and have different, overhaul, to see and hear more, You can use the sound characteristics according to the fault or determine beep location, locate and repair faults.
(1) abnormal noises occur in the control loop, issued a "hum" noise, usually contactor malfunction (such as AC contactor contacts being exposed, the voltage level does not match, the core was stuck, etc.) to deal with fault contact with device for repair, you can not repair must be replaced after processing, self-noise elimination.
(2) motor makes any abnormal noise, immediately stop and check whether the motor running single phase, or bearing damage, coupling axis errors and "sweep chamber" faults, these will make the motor abnormal sound, the sound of a different fault location and the level and tone a difference, single-phase operation, the entire motor makes regular suddenly strong suddenly weak "buzzing" sound; while the bearing is damaged when the bearing near the issue along with the "thump - thump" of the "buzz" sound; while coupling axis errors, or when the motor slight sweep chamber, the entire motor makes high "buzzing" sound, not when accompanied by a shrill voice. In short, the difference should be based on the noise, to find fault, for itemized repair and restore normal performance of the motor when the motor fault untreated, prohibit the use of gourds.
(3) abnormal noises issuing from the reducer, reducer failure (such as lack of lubrication or bearing gearbox, gear wear or damage, bearing damage, etc.), then should stop to check, first determine the reducer gearbox or bearing added prior to use lubricating oil, lubricating oil use is changed regularly, if not required lubrication, reducer will not only generate excessive "buzzing" sound, but also excessive wear or damage to the gears and bearings.
3, fell down when braking distance exceeds requirements
Electric hoist long-term application, the brake ring wear is too large, the brake spring pressure decreases, the braking force is reduced. The workaround is to adjust the brake bolt or replace the brake ring.
4, the motor temperature is too high
Should first check the hoist is overloaded with overloading the motor heat, long-term overload the motor will burn; motor is not overloaded, still hot, you should check whether the motor bearing damage; should also check whether the motor is required duty work, which is caused by the motor heat One of the reasons, should be used in strict accordance with the motor duty work. The motor is running, the brake gap is too small, not fully disengaged, have a great friction, friction heat, while also representing an increase of additional load, the motor speed is reduced, the current becomes large fever, you should stop working, re- Adjust brake clearance.
5, the weight rose to the air, can not re-start after stopping
First check whether the voltage is too low or fluctuating system is too large, the case of such a situation, only the other voltage returns to normal after the start; hand, we should pay attention to the three-phase motor operation phase, after the shutdown can not start, then you need to check Power phase.
6, you can not stop or to limit position remains Parking
Such situation is generally contactor contact welding, press the stop switch when the contactor contacts can not be disconnected, the motor running as usual energized, hoist without stopping; into extreme positions such as limit malfunction, Hulu does not Parking. This happens, immediately cut off the power, the gourd forcibly stop. After stopping, repair contactors or stopper, serious damage can not be repaired and must be replaced.