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High voltage liquid rheostat soft starter repair motor

Jan 08, 2021

High voltage liquid rheostat soft starter repair motor

The high-voltage liquid rheostat soft starter repairs the motor. The current limit multiple: 3.0 times; 15 seconds to start. 20) Application of soft starter in hydraulic pump station equipment. There are also literature reports on the application of soft starter in hydraulic pump station equipment. A domestic hydraulic pump station has 4 sets of 110KW hydraulic motor soft starters, which require three use and one backup, and one Three 3RW22 soft starters were used to start the motor soft starters in turn. In order to improve the reliability of the scheme, a soft starter was added later. 21) The application of soft starters in concrete pumps. With the rapid development of urbanization, the number of high-rise buildings is increasing, and the construction machinery is becoming more and more universities and large-scale. For example, the power of soft starters of large quantities of electric concrete pump motors has reached or exceeded Above 10KW, affected by the fluctuation of the grid voltage, the traditional step-down starting method can easily cause the motor soft starter to block, and it is often difficult to start at the construction site. 22) The application of soft starters in centrifuges. Various types of centrifuges are used in industries such as chemical industry, grain deep processing, water treatment, casting, and coking.


High-voltage liquid rheostat soft starter repair motor can not get up


Some reasons for SCR short circuit in soft starter:


The line side three-phase power connection of the PCS / PF / PCE controller is loose or the conductor is damaged


The wire on the load side of the PCS/PF/PCE controller is damaged to the motor


The internal winding of the motor is damaged


The PCS / PF / PCE control module caused continuous physical damage to the control circuit board components


Surges, spikes, interferences, and overvoltages in three-phase power distribution circuits may cause SCR breakdown and short circuit


Excessive voltage and current in the three-phase power supply of the PCS/PF/PCE soft starter will cause SCR breakdown and short circuit


Focus on eliminating and reducing the harm of water hammer. When the liquid is suddenly accelerated or decelerated by external force in the pipeline system, or changes the flow direction, it will cause water hammer. Water hammer is very harmful, from the slightest it causes the pipeline system to vibrate and emit noise, and the serious is to cause damage or even the pump room. Flooded. The soft starter with general functions cannot completely eliminate the water hammer phenomenon, but it can basically reduce the water hammer hazard. If you want to completely eliminate the water hammer hazard, you need a soft starter with a special pump stop function. The actual application of various brands of soft starters shows that the soft stop time of general function soft starters can not be set too long to prevent water hammer, generally 4~6 seconds (similar to the effect of a micro-resistance quick-closing check valve). If the time is too long, it is easy to damage the soft starter. The specific reason has not been reported yet. 2) The application of soft starters in fire pump control. Hydrant pumps and sprinkler pumps are important fire-fighting equipment for fire-fighting facilities in industrial and civil buildings. Their operational reliability is extremely important. With the construction of large and medium-sized construction projects.


High-voltage liquid rheostat soft starter repair motor can not get up


Steps to troubleshoot and repair and solve these soft starter faults:


1. Confirm that the PCE dial switch 15 or PF motor connection selection is set to the correct motor connection type. Set it to the line connection of the three-head motor (PCE's DIP switch 15 Up); set it to the Delta Connection of the six-lead Wye Start Delta motor (for PCE, set the DIP switch 15 down).


2. Verify that the three-phase power connection on the line side of the PCS / PF / PCE controller is firm; the conductor cable is properly damaged.


3. Make sure the wire connecting the load side of the PCS/PF/PCE controller to the motor is fastened; the conductor cable is properly damaged.


4. Shake the motor to ensure that the motor windings are not damaged. Before using the megohmmeter to measure and test the motor windings, remove the motor leads from the PCS/PF/PCE controller.


5. If the SCR of the PCS/PF/PCE soft starter is short-circuited by mistake, please check the resistance on each power pole (L1 to T1, L2 to T2, L3 to T3).


6. If the SCR is normal and not short-circuited, the resistance check of all three phases should be 10,000 ohms or more. The short-circuited SCR resistance will be much smaller than the normal 10,000 ohm reading. Before performing these checks, please do the following: remove the motor wires from the bottom of the PCS / PF / PCE soft starter; disconnect the three-phase and control power from the PCS / PF / PCE soft starter


High-voltage liquid rheostat soft starter repair motor can not get up


The asynchronous motor soft starter filters out the sine waveform from the PWM widened carrier, and generates a constant rotating magnetic field required for electric motors; and changes the synchronous speed of the asynchronous motor soft starter by changing the frequency to realize the frequency conversion adjustment of the AC motor soft starter The difference between the two speed objectives is: soft start is trying to cut and destroy the sinusoidal waveform, it is easy, as simple as water flowing to a low place; the frequency converter is to do everything possible to obtain a sinusoidal waveform with adjustable frequency, which is difficult! It's as difficult as water flowing up high. Pay attention to the soft starter information, and pay attention to the Lingke Electric soft starter site. We will sort out more soft starter knowledge for you from time to time! Lingke Electric-Urgent your needs! To buy a soft starter, choose Shanghai Lingke Electric Company! How much do you know about the overheating protection function of the soft starter? Today, the soft starter manufacturer Lingke tells you the following: detect the temperature of the thyristor radiator through the internal thermal relay of the soft starter (1) Selection of soft starter: The common soft starters on the market currently have bypass type and no bypass type , Energy-saving type, etc., and the process of frequency converter starting motor soft starter is frequency conversion speed regulation.


The structure is also much more complicated. Soft starter: Thyristor AC voltage regulating circuit, which is a circuit that obtains AC power with adjustable average voltage by adjusting the conduction angle of the thyristor and cutting the waveform of sinusoidal AC power; this AC voltage regulating circuit is used for automatic heating and temperature control Circuits, stage dimming circuits, and other load circuits that have nothing to do with the AC waveform and only related to the average voltage; but some people and even so-called experts use this thyristor AC voltage regulator circuit for the start of asynchronous AC motor soft starters. Its name is soft start; because the asynchronous AC motor soft starter works under the three-phase symmetrical sinusoidal AC waveform, it has a constant rotating magnetic field; if the conduction angle of the thyristor is adjusted, the sinusoidal AC waveform is cut Alternating current used in asynchronous AC motor soft starter cannot produce a constant rotating magnetic field; this AC waveform used in asynchronous motor soft starter completely destroys the starting performance of asynchronous motor soft starter.


High-voltage liquid rheostat soft starter repair motor can not get up


The high-voltage liquid variable resistance soft starter repairs the motor without impact on the motor soft starter, which improves the reliability of power supply, starts smoothly, reduces the impact torque on the load machinery, and extends the service life of the machine. There is a soft stop function, that is, smooth deceleration and gradual shutdown. It can overcome the shortcomings of instantaneous power failure, reduce the impact on heavy-duty machinery, avoid the water hammer effect of the elevation water supply system, and reduce equipment damage. The starting parameters are adjustable and can be selected according to the load conditions and the characteristics of the grid relay protection, and can be steplessly adjusted to the best starting current. The drawback of the traditional starting method is that the pressure reduction ratio is not adjustable. The contactor is switched. Poor reliability. There is a secondary shock. It can only control the start. The difference between the soft starter and the traditional starting method is highly intelligent. The starting curve is adjustable to meet the requirements of different loads. Non-contact type, similar to solid state relay, with high reliability. The starting curve is continuous without secondary impact. It can control soft start and soft stop.