LCD motor protection wiring and connection

Title:ST571M-A-F-100A-V2M1+ST522L+DP motor protectionNanjing Swo 189 Ceramic 5244 Factory 6334 is at your service. For many years, the company has been working withGuojia ElectricShanghai Baosteel Group, PetroChina, Sino French Water Group, Volkswagen, Wengfu Chemical, Zhonglian Cement, Mongolia Electric Power ABB、 Schneider, Siemens and other well-known manufacturers have established good cooperation, and our products have also been tested and recognized by the State Grid Electric Power Research Institute and the East China National Metrology and Testing Center.

1、 Development Status of Domestic Motor Protectors

In electric machinery and equipment used in industrial and agricultural production, there are often long-term "big horse pulling small car" and long-term no-load operation of electric motors during variable load operation, resulting in serious loss of active and reactive power of electrical energy.

The UL-E2 type and multifunctional energy-saving motor protector (motor protector) produced by our company are based on the principle that reducing the terminal voltage of the motor under light (empty) load can improve its power factor and working efficiency. By automatically tracking and detecting the phase of the motor's operating voltage and current, analyzing the motor's load status based on the phase, and automatically adjusting the motor's operating voltage, the motor's magnetic flux effectively matches the motor's load torque, effectively reducing the motor's reactive power loss, active power loss, and excitation loss, improving the motor's working efficiency, and achieving the goal of energy conservation and consumption reduction. By using Y - △ conversion, the terminal voltage of the motor under light (empty) load is reduced to 3/3 of its original value, and the iron loss of the motor is also reduced to 1/3 of the principle (because the iron loss of the motor is proportional to the square of the terminal voltage). At the same time, the current of the motor also decreases. As the copper loss is proportional to the square of the current, the copper loss also decreases, achieving the goal of energy conservation.

For example, the relevant numbers for the JO2-52-4 three-phase asynchronous motor are as follows:

Pe=10KWVe=380Vne=1452 revolutions per minute Mfz=0.1Me. If the stator winding is changed from a "△" shape to a "Y" connection during operation, the COS psi increases from 0.2996 to 0.634, and the efficiency μ increases from 66.7% to 79.7%. The input power of the stator will increase from 1514W to 1255W

If the load is light for 20 hours per day and 300 working days per year, the energy savings per year will be:

A=(1.514-1.255) × 20 × 300=1554 degrees

This device has a good energy-saving effect. When unloaded, it can reduce the starting current by more than 70%, reduce the input power by about 70%, reduce the operating power by 47.6%, and save more than 50% of electricity when unloadedtallIt can reach 68%, especially for motors that are often under low load and have frequent load changes, with an average power saving rate of (16-40)%. It improves the power factor, reduces grid line loss and transformer copper loss, and is an ideal comprehensive device for motor energy-saving starting.

Therefore, motor protectors not only ensure normal production in industry and agriculture, improve production efficiency and economic benefits, but also have important significance in energy conservation.

More model options: ST571MAL2E, CDP-M10-1C, M60-1SV2, TM101-A/100A, CDP-M10, PMAC802-6.3

WDH-31-213A-2A、ST573-63A

2、 Functional Features

The maintenance management function has the ability to record the cumulative running time of the electric motor and the cumulative operation times of the contactor;

Can query event records with time stamps, including restart records, start records, and stop records;

Equipped with remote control function, it can achieve network remote control and input external remote control position selection;

Analog input, switch input, and output modules with complete electrical safety isolation inside;

Standard communication interface, Modbus RTU protocol, ProfiBus DP protocol, DeviceNet protocol optional;

The restart device has online maintenance function, which can modify the running program and engineering data online;

The CPU adopts an embedded low-power microprocessor, which is more reliable and stable;

Can control the restart of 128 electric motors (zui)bigQuantity)

3、 Precautions for use:

1. In terms of motors, it is necessary to first understand the model specifications, motor functional characteristics, protection situation, rated voltage, rated current, rated power, power frequency, insulation level, etc. These contents can provide users with reference on how to correctly use, maintain, and select protectors.

2. Environmental conditions: mainly refer to normal temperature, high temperature, high cold, corrosion degree, vibration degree, sandstorm, altitude, electromagnetic pollution, etc.

3. The purpose of electric motors: mainly refers to the characteristics required for dragging mechanical equipment, such as fans, water pumps, air compressors, lathes, oil field pumping units, and other mechanical characteristics with different loads.

4. In terms of control system, the control modes include manual, automatic, local control, remote control, independent operation of a single machine, and centralized control of the production line. The starting methods include direct, voltage reduction, star delta, frequency sensitive variable resistor, frequency converter, soft start, etc.

4、 Classification of motor faults

For electric motors, their fault forms can be divided into two aspects from a mechanical perspective: winding damage and bearing damage. The main reasons for winding damage are:

(1) Under long-term electrical, thermal, mechanical, and chemical reactions, the insulation of the winding ages and is damaged, resulting in inter turn short circuits or ground short circuits in the stator and rotor windings.

(2) Poor power supply quality in the power grid, unbalanced three-phase power supply voltage, large voltage fluctuations, distorted power grid voltage waveforms, severe harmonic distortion in the design of high-order microcontroller based motor protectors, or motor phase failure operation.

(3) The low power supply voltage results in insufficient starting torque for the motor, causing it to fail to start smoothly or repeat starting in a short period of time. Prolonged exposure to excessive starting current can cause the motor to overheat.

ST571M-A-F-100A-V2M1+ST522L+DP motor protectionNanjing Swo 189 Ceramic 5244 Worker 6334 at your service!