X
Electric hoists represent their own machinery, strength, and toughness, while the stage is elegant, flowing, and soft, with conflicts and collisions between the two.
How can electric hoists operate safely under undervoltage?
Category : V7 Stage Electric Series
Get a Quote
Product Details
How can electric hoists operate safely under undervoltage?
In practical life, the voltage fluctuation of power grids in many regions is significant, and even 380V voltage sometimes drops to 300V or even 260V. This has a serious impact on the electric hoist motor. Once the power supply voltage is unstable, it directly weakens the magnetic field of the contactor, greatly reduces the reliability of suction, and often causes the iron core of the contactor to vibrate continuously. The circuit also breaks with time, and the contactor contacts are very easy to burn out. It can take a few days to replace the contactor, or even directly burn out the motor. On the other hand, electric hoists controlled by contactors are prone to accidents.
In fact, as long as the number of turns of the original contactor coil is removed, for example, the 380V40A contactor coil was originally 3600 turns, and 720 turns can be removed (other working voltages and capacities can be extrapolated). The author has made the above modifications to four electric hoists, some of which have been operating safely for over five years, and the contactors can reliably close when the power supply voltage drops from 380V to 260V; When the voltage rises to 480V, the contactor still operates safely. This is because the electric hoist is always in a short-term intermittent use environment, with six strokes of east, south, west, north, up and down, and each working time will not exceed 5 minutes.
As for contactors that operate under long-term working conditions and motors that use contactors for undervoltage protection, the excitation current will increase significantly due to a decrease in coil turns. This method cannot be used to prevent equipment damage
Previous: European Motor Electric Chain Hoist
RELATED PRODUCTS .
Powerful Stage Truss Hoist can provide convenience and support for the construction of facilities in large conferences, seminars and other meeting activities, meet the requirements of venue layout for
Flexible stage truss motors are typically made of lightweight and high-strength materials such as aluminum alloy, which not only facilitates transportation and installation but also can bear heavy loa
Stage light manual chain hoists, with their low cost, ease of operation, and non-reliance on electricity, have become an ideal choice for small and medium-sized stages, emergency scenarios, and requir
Truss slings for lifting are widely used in the hoisting of stage lighting trusses and outdoor performance equipment, especially in scenarios requiring frequent disassembly and assembly or exposure to
2025-02-28
创始人
0
The participation of Tianjin Kemei in the Guangzho...
Tianjin Kemei made a remarkable and eye-catching appearance at the Guangzhou (International) Performing Arts Equipment, Intelligent Acoustic, Optical and Electrical Products...
2025-02-27
创始人
0
Guangzhou (International) Performing Arts Equipmen...
In the era of the rapid development of stage lifting equipment and intelligent acousto - optic technology, every industry event serves as a crucial opportunity for innovatio...
2025-02-27
创始人
0
GET show Guangzhou (International) Performing Arts...
Tianjin Kemei Machinery Manufacturing Co., Ltd. has been deeply engaged in the stage equipment manufacturing field for many years and has developed into a modern benchmark e...
2024-09-24
admin
0
Tianjin Kemei Machinery Manufacturing Co., Ltd. Ne...
Tianjin Kemei Machinery Manufacturing Co., Ltd.: New Starting Point, New Journey - New Factory Relocation Record
