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 .
Stage electric hoist is a common lifting and hoisting machinery on stage, which is easy to operate and not prone to malfunctions. However, even so, there may be errors in operation that can cause prob
The stage electric hoist will make the stage more dazzling. You can hang the sound and lighting equipment on the stage. In order not to affect the stage lighting, the whole body is painted black. So,
The stage electric hoist independently developed by Tianjin Kemei has completely overturned the poor quality and low efficiency of domestically produced electric hoists through practical actions. Our
Auto shows are mainly held by businesses to showcase automotive products and related technologies, promote communication between car manufacturers and consumers, and drive the development of the autom
2024-08-23
admin
0
China Guangzhou Lighting and Sound Exhibition
Tianjin Kemei Machinery Manufacturing Co., Ltd. participated in the lighting and audio exhibition in Guangzhou, China on May 23, 2024
2023-12-19
admin
0
Why should the stage hand hoist work environment b...
The stage hoist often operates in outdoor environments and inevitably comes into contact with a large amount of dust.
2023-12-18
admin
0
Do not use stage gourds in violation of regulation...
Stage gourds are divided into two types: stage electric gourds and stage chain gourds, mainly used for stage construction, prop lifting
2023-12-18
admin
0
The "Invisible Cloak" of Stage Electric Hull
The stage electric hoist is a commonly used lifting tool when building a stage. It has a compact appearance and is easy to use
