Sanjin Elevator: Elevator inverter plays what role in the elevator

Sanjin Elevator: Elevator inverter plays what role in the elevator: If the given acceleration time is too short, the elevator inverter output frequency changes much more than speed (electrical angular freque...

Elevator inverter plays what role in the elevator

If the given acceleration time is too short, the elevator inverter output frequency changes much more than speed (electrical angular frequency) change, the drive will overcurrent flows due to trip, running stop, which is called stall. In order to prevent stalling of the motor continues to run, it is necessary for detection of the current size of the frequency control. When the acceleration current is too large appropriate to slow down the acceleration rate. Deceleration as well. Combine the two is the stall function.
Acceleration and deceleration can be respectively given model, for quick acceleration, slow deceleration occasions, or for a small machine requires strict tact time given occasion is appropriate, but for the fan drive and other occasions, acceleration and deceleration time longer acceleration time and deceleration time can be given together.
If you lower the motor during operation command frequency, the motor becomes non-state synchronous generator running, while working as a stopper, which is called regenerative (electric) braking.
Regenerative energy from the motor out of the piling in the elevator inverter filter capacitor, the capacitance of the capacitor and the voltage relationship between the general frequency of the rated torque of the regenerative braking force of 10% -20%. If using the optional parts brake unit, can reach 50% -100%.
Automatic control system signal can be set freely by the elevator inverter flexible frequency change command and control process indicators, such as in the tobacco industry, sugar, spices process, known by the belt drive traffic signals to control the frequency of the rotational speed of the pump with the flow signal changes automatically adjust feeding amount evenly add flavor, sugar. Production line can also use start-stop signal through the positive and negative terminals of the elevator inverter control starting and stopping and positive, reverse and become a part of automatic assembly line. In addition, in the assembly line, the current device is faulty rear side equipment should be automatically shut down. elevator inverter emergency stop client can achieve this functionality. In SANKEN, MF, FUT and FVT series elevator inverter can be pre-set three or four or even up to seven frequencies, some devices can be set accordingly automated production processes. Set frequency and time, the drive motor can sequentially at different times with different speed operation, to form an automated production process.

Sanjin Elevator: Elevator inverter plays what role in the elevator ...

Sanjin Elevator: Elevator inverter plays what role in the elevator ...: Frequency down (low), if the same power output, the current increases, but under certain conditions, the torque current is almost constant....

Elevator inverter plays what role in the elevator (b)

Frequency down (low), if the same power output, the current increases, but under certain conditions, the torque current is almost constant.
Using elevator inverter operation, with a corresponding increase in the acceleration of the motor frequency and voltage, the starting current is limited to 150% of rated current (according to different models, 125% -200%). Labor-frequency power directly when starting current of 6-7 times, therefore, will have an impact on the mechanical and electrical. With elevator inverter drive can smoothly start (start time becomes longer). Starting current of 1.2-1.5 times the rated current, starting torque of 70% -120% of the rated torque; For enhanced functionality with automatic torque converter, the starting torque of 100% or more, you can start with a full load .
Frequency drops voltage V is also proportional to the decline, the question has been answered four instructions. The ratio between V and F are considered characteristic of the motor determined in advance, usually in the controller memory means (ROM) in that there are several features that can switch or the dial to select.
Down completely when the frequency is reduced proportionally to the voltage, the impedance becomes smaller as the DC resistance constant, would result in a low torque is generated under a reduced tendency to. Therefore, given the low frequency V / F, the output voltage is increased to make some manner so as to obtain a starting torque, this compensation called enhanced start. Variety of methods can be used, a method of automatically select V / F mode or adjusting potentiometer and other methods.
In 6Hz still output power, but according to the temperature rise and motor starting torque of the size of the other conditions, the lowest frequency of use to take 6Hz, at which point the motor rated torque can be output without causing severe heat problems. Actual elevator inverter output frequency (starting frequency) based on models for the 0.5-3Hz.
Normally when not. Above 60Hz (50Hz or more modes also) voltage constant, a substantially constant power characteristics, require the same torque at high speed, we must pay attention to the choice of motor and elevator inverter capacity.
Motor means to be used for speed detection device (PG), the actual speed back to the control means controls, called "closed loop", without PG operation is called "open loop." Universal Converter, mostly open-loop mode, and some models can be use PG feedback option.
Open-loop, the elevator inverter even if the output for a given frequency, the motor with a load operation, the motor speed in the range of the rated slip (1% -5%) change. For applications requiring speed accuracy is relatively high, even if the load change also requires close to a given speed operation of the occasion, PG feedback function can be used with the drive (optional part).
With PG feedback function of the elevator inverter, the accuracy improves. But the speed depends on the accuracy of implant PG itself elevator inverter output frequency accuracy and resolution.

Sanjin Elevator: Elevator inverter plays what role in the elevator ...

Sanjin Elevator: Elevator inverter plays what role in the elevator ...: The main role of the elevator inverter by changing the frequency of alternating current, energy efficiency and speed, and to achieve automa...

Elevator inverter plays what role in the elevator (a)

The main role of the elevator inverter by changing the frequency of alternating current, energy efficiency and speed, and to achieve automatic control and precision control.
The elevator inverter is the use of power semiconductor devices will be the role-off frequency to another frequency power conversion power control devices. Can be divided into AC - AC elevator inverter, AC - DC - AC elevator inverter. AC - AC elevator inverter alternating current into direct are variable frequency and voltage AC; AC - DC - AC elevator inverter is first rectified alternating current into direct current by the rectifier first, and then through the elevator inverter to the DC current and voltage can be changed into a frequency of alternating current.
PWM is the English Pulse Width Modulation (Pulse Width Modulation) acronym, according to certain rules to change the pulse width of the pulse train to adjust the output volume and a tone waveform by value. PAM is the English Pulse Amplitude Modulation (pulse amplitude modulation) acronym is changed according to certain rules pulse amplitude pulse train, to regulate the output value and a modulation waveform.
elevator inverter main circuit can be divided into two categories: voltage is converted to DC voltage source elevator inverter AC and DC circuit filter is a capacitive; Current DC current source is converted to AC elevator inverter, its stone DC circuit filter inductor.
Asynchronous motor torque and the rotor flux of the motor a current flows resulting from the interaction between the rated frequency, if the voltage is fixed and only reduce the frequency, then the magnetic flux will be too large, the magnetic circuit saturation, severe when burning motor. Therefore, the frequency and voltage proportional to a change, that is to change the frequency converter output voltage while controlling the motor to maintain a certain flux, to avoid weakening and magnetic saturation phenomenon. This control method is used for fan and pump energy-saving elevator inverter.

Sanjin Elevator: Routine maintenance of the elevator inverter

Sanjin Elevator: Routine maintenance of the elevator inverter: Application has been common drive fans, pumps, etc. to expand into the food, beverage, logistics, elevator drive internal structure buildin...

Routine maintenance of the elevator inverter

Application has been common drive fans, pumps, etc. to expand into the food, beverage, logistics, elevator drive internal structure building, and constantly open new energy field, and its function has also been improved and diversified, one is all-digital, fully functional, able to compensate for load changes adaptive, self-tuning technology, especially distributed communications, networking and integration of PLC-end elevator inverter; hand is simple or industry-specific mechatronic drive as well as small and medium of elevator inverter. In addition, new high-voltage power electronic devices because the advent of high and medium voltage elevator inverter also has made ​​great progress.
If they do maintenance work on the drive, you can greatly decrease the failure rate of the drive:
An elevator electrical room temperature is not too high, otherwise the drive components easy to aging, the best air-conditioned, the consequences quite good;
2, to prevent rain water, usually in a typhoon, the windows broken by the wind leaving the elevator inverter shower to rain;
3, lightning, this would relate to the whole building or all of the district mine facilities, so she was struck by lightning individual elevator inverter severe damage;
4, the drive's cooling fan to regularly dust cleared, the elevator inverter repair method using DC resistance line voltage detection and measurement are two methods and found that there was a noise or exchange will not run;
5, elevator motors unusual noise is usually drive problems, such as motor phase current is not balanced, then the best we must repair the damage is not complete until the elevator inverter may be more severe.

Sanjin Elevator: Elevator use the elevator inverter issues

Sanjin Elevator: Elevator use the elevator inverter issues:     With the power thyristor (SCR) power transistor (GTR) and the new field-effect transistor (IGBT) have come out, frequency conversion te...

Elevator use the elevator inverter issues

    With the power thyristor (SCR) power transistor (GTR) and the new field-effect transistor (IGBT) have come out, frequency conversion technology from the 1960s appeared so far has matured universal use in various electric fields. Elevators and other special mechanical and electrical equipment is no exception, the drive also makes the technical content, performance is leaps and bounds, with the traditional way of comparing the effect of speed is fresh obviousness see. It makes the elevator efficiency, smooth running, extend equipment life, combined with a PLC or computer control, but also demonstrate the superiority of non-contact control: Line simplified, flexible control, reliable operation, easy maintenance and fault monitoring. Seen by the elevator inverter works, the installation must meet certain requirements in order to work properly, the elevator inverter itself inevitably produce harmonic interference and electromagnetic radiation and other common problems, but the elevator power is larger, poor working environment, the safety factor requirements high, therefore, led to the elevator inverter in the installation and maintenance of a number of issues.

1, harmonic interference problems
1.1 Interference of the mechanism
    elevator inverter main circuit is generally cross - straight - cross forms, namely rectifier (AC / DC) and an elevator inverter section (DC / AC) component, the first three-phase bridge rectifier power supply, and then by power transistor switching element for DC / AC converter.
    In the input section, the input voltage is a sine wave, nonlinear three-phase bridge rectifier diodes and discrete diode parameters will cause a non-sinusoidal input current waveform. In the output section, the output line voltage is SPWM pulse width modulated square wave, the phase voltage is a step wave, are nonlinear. The output current is nearly sinusoidal with a burr. Since it is a non-linear sine wave, then he will produce harmonics. Theoretically, harmonics multiple of 3 does not contain harmonics and even harmonics, the Fourier series decomposition according to the fundamental and harmonic, and generally contains 6n +1 (n = l, 2,3 ... .) harmonics. Harmonic frequency elevator inverter modulation frequency, which were 5, 7, 11, 13th harmonic current dominant.
1.2 Interference hazards
    Input current harmonic distortion causes the grid voltage, causing the impact on other electrical equipment, such as the transformer temperature rise, resulting in vibration noise; cause protection of electrical malfunction; cause measuring instrument error; insulation damage, affecting the electrical work and reduce life expectancy and so on.
    According to GB12668-90 requirements management standards of higher harmonic voltage integrated grid voltage harmonic distortion is THD% ≤ 10%, odd harmonics THD% ≤ 5%, even harmonics THD% ≤ 2%.
    Both output voltage and current harmonics, the modulation frequency is low, the human ear could hear high harmonic frequencies generated electromagnetic noise (screams), harmonic heat and vibration caused by the motor, the peak voltage or insulation breakdown , reactive big loss, cosφ reduction. Modulation frequency higher harmonics impact should be small, but no matter the level of the modulation frequency, harmonic electromagnetic coupling are formed through the wire inductive interference, and through the cable to the space launch high-frequency electromagnetic radiation interference on the surrounding lines, electrical equipment and other adverse effects, such as interference with the elevator door control signal so that it is not working properly, the computer board LCD error, computer clocks stop working. Under normal circumstances, the elevator inverter output harmonic voltage THD% of total synthesis should be controlled at between 5% to 7%.
1.3 Interference suppression
    Regardless of the input or output harmonic interference caused by nothing more than its mode of transmission line conduction, inductive coupling and air radiation in three ways, so the interference suppression measures we have from several aspects:
    (1) connected reactors and filters. Input access to AC reactor ACL, it 5-9 harmonics suppression effect is very significant, cosφ also be increased to 75% to 85%, the output is generally not connected to the reactor, the reactor when choosing the best drop controlled at 5% or less. Connected in series between the rectifier bridge and filter capacitor DC reactor DCL also markedly inhibited the harmonic currents and improve power factor. Then the power filter should pay attention to: the output side of the filter capacitor connected to the motor side only, and should be connected resistors to prevent the elevator inverter due to capacitor charging and discharging by shock, filter reactor phase connection cable must be in the same direction around the In the same magnetic core to no effect on the fundamental current. Capacity greater than 22KW generally used in parallel when the power supply filter.
2) reasonable shielded cabling and wiring. Use separate transformer elevator inverter power elevator inverter simultaneously use two more to be away from each other; Other equipment and control lines in the layout as far away from the elevator inverter input and output lines (minimum is also more than 10cm), and do not run in parallel with line, the best vertical cross; signal control lines twisted inhibit phase differential mode interference signal; reasonable ground wiring devices harmonic interference suppression also one of the ways, according to state regulations in addition to grounding wire with a grounding wire to ensure sufficient grounding resistance of less than 5Ω, the elevator inverter should be grounded separately, grounding point as close to the elevator inverter, ground wire away from power lines can not be connected and the power of the zero line; pair of main circuit (elevator inverter to the motor cable) for wear metal tube shield, and as short as possible, control signal lines can also be used shielded cable, shielded cable should be close to the side of the elevator inverter control circuit is connected to the COM terminal, while the shield grounded at one end only.
    (3) Other equipment interfere with isolation transformer on the grid for power supply isolation, with photocoupler isolation disturbed signal.
    (4) may also reduce the carrier frequency relative to eliminate the interference, but the noise might be a little bigger, the current waveform smoothness to be satisfactory, the specific site commissioning OK. I encountered appeared in the elevator debug the door harmonic interference signal error, the carrier frequency between 8 ~ 10K reduction in the value of the appropriate troubleshooting.
    (5) can also be used when necessary, zero-phase-sequence reactance, surge absorber and surge suppressors.

Sanjin Elevator: Elevator inverter principle (c)

Sanjin Elevator: Elevator inverter principle (c): We repair a lot of the elevator elevator inverter schematic elevator inverter for elevator and found a lot of trouble because of their work...

Elevator inverter principle (c)

We repair a lot of the elevator elevator inverter schematic elevator inverter for elevator and found a lot of trouble because of their work environment through high temperature components likely caused by aging, elevator elevator inverter installed in the building's topmost control room, often in the summer by sun exposure, coupled with the drive itself and the braking resistor heating, the electrical room temperature is very high, the working environment temperature will shorten the life of electronic components! Drive more obvious in this regard, the elevator electrical room ventilation problems in the design in addition to also pay attention to insulation, such as walls with hollow bricks, chamber top multi-layer design, if accompanied by an air conditioner, the drive's lifespan considerably longer !

Sanjin Elevator: Elevator inverter principle (b)

Sanjin Elevator: Elevator inverter principle (b): Typically, the voltage and frequency fixed frequency alternating current is converted to a variable frequency AC voltage or a device called...

Elevator inverter principle (b)

Typically, the voltage and frequency fixed frequency alternating current is converted to a variable frequency AC voltage or a device called a "drive." In order to generate a variable voltage and frequency, the device is first necessary to convert AC power to DC (DC), this process is called rectification. The direct current (DC) is converted into alternating current (AC) of the device, its scientific term for the "elevator inverter" (elevator inverter). General elevator inverter is the DC power elevator inverter is a certain fixed frequency and constant voltage power elevator inverter. For the adjustable frequency elevator inverter, voltage adjustable frequency elevator inverter we called. elevator inverter output waveform is an analog sine wave, is mainly used in three-phase induction motor drive with, also known as elevator inverter. Mainly used in the instrumentation for the detection devices require a higher variable frequency wave elevator inverter, to sort out the waveform, you can output standard sine wave, called the variable frequency power supply. Frequency power elevator inverter prices are generally 15 - 20 times. Since the elevator inverter device generates a voltage or frequency changes in the primary device called "elevator inverter", so the product itself is named "elevator inverter", namely: elevator inverter. elevator inverter can also be used in home appliances products. Use the elevator inverter home appliances products, not only motor (such as air conditioning, etc.), as well as fluorescent lamps and other products. elevator inverter for motor control, either change the voltage, but also can change the frequency. But are used primarily for regulating fluorescent lamp elevator inverter power supply frequency. Used car battery (DC) to produce alternating current devices "elevator inverter" name for sale. The working principle of the elevator inverter has been widely used in various fields. Such as computer power supply, in the application, the drive for inhibiting reverse voltage, frequency fluctuations and power of instantaneous power.

Sanjin Elevator: Elevator inverter principle (a)

Sanjin Elevator: Elevator inverter principle (a): Now elevators are used to control the frequency converter, the fault when the elevator inverter will cause inconvenience to many people, i...

Elevator inverter principle (a)

Now elevators are used to control the frequency converter, the fault when the elevator inverter will cause inconvenience to many people, if maintenance personnel can correctly understand the principle of elevator drive, then you have easy maintenance. Here by us Hui Bo Times Technology Co., Ltd. was telling you about this knowledge.
VVVF Variable Voltage and Variable Frequency is the acronym meaning changing the voltage and frequency of change, that is, they say, VVVF.
CVCF is Constant Voltage and Constant Frequency acronym, meaning constant voltage, constant frequency, that is, they say, constant voltage constant frequency.
We use the power into AC power and DC power, DC power supply generally mostly through the transformer from the AC power source transformer, rectifier obtained. AC power using the power of the people accounted for 95% of the power used. Whether for home or for factories, single-phase and three-phase AC power supply, the voltage and frequency according national regulations have certain criteria, such as mainland China provides direct user single-phase AC power is 220V, three-phase AC wire voltage 380V, frequency of 50Hz, other countries may be in supply voltage and frequency of the voltage and frequency are different, if single-phase 100V/60Hz, three phase 200V/60Hz, etc., the standard voltage and frequency of the AC power supply called frequency alternating current.

Sanjin Elevator: Elevator inverter basics (b)

Sanjin Elevator: Elevator inverter basics (b): 1, was written in the manual speed range 60 ~ 6Hz, namely 10:1, then the following 6Hz no output power do? In 6Hz still output power, but ...

Elevator inverter basics (b)

1, was written in the manual speed range 60 ~ 6Hz, namely 10:1, then the following 6Hz no output power do?
In 6Hz still output power, but according to the temperature rise and motor starting torque of the size of the other conditions, the lowest frequency of use to take 6Hz, at which point the motor rated torque can be output without causing severe heat problems. Actual elevator inverter output frequency (starting frequency) based on models for the 0.5 ~ 3Hz.
2, for the general motor combination is above 60Hz also requires a certain torque, can we?
Normally when not. Above 60Hz (50Hz or more modes also) voltage constant, a substantially constant power characteristics, require the same torque at high speed, we must pay attention to the choice of motor and elevator inverter capacity
3, the so-called open-loop What does it mean?
Motor means to be used for speed detection device (PG), the actual speed back to the control means controls, called "closed loop", without PG operation is called "open loop." Universal Converter, mostly open-loop mode, and some models can be use PG feedback option.
4, the actual speed deviation for a given speed on how to do?
Open loop, even if the output for a given frequency of the elevator inverter, the motor with the load operation, the motor speed at the rated slip of the range (1% to 5%) change. For applications requiring speed accuracy is relatively high, even if the load change also requires close to a given speed operation of the occasion, PG feedback function can be used with the drive (optional part).
5, if a motor with PG, feedback can improve speed accuracy after you?
With PG feedback function of the elevator inverter, the accuracy improves. But the speed depends on the accuracy of implant PG itself elevator inverter output frequency accuracy and resolution.
6, stall prevention function is what does this mean?
If the given acceleration time is too short, the elevator inverter output frequency changes much more than speed (electrical angular frequency) change, the drive will overcurrent flows due to trip, running stop, which is called stall. In order to prevent stalling of the motor continues to run, it is necessary for detection of the current size of the frequency control. When the acceleration current is too large appropriate to slow down the acceleration rate. Deceleration as well. Combine the two is the stall function.
7, there is acceleration time and deceleration time can be given, respectively, models, and ramp time together given the aircraft, what's the point?
Acceleration and deceleration can be respectively given model, for quick acceleration, slow deceleration occasions, or for a small machine requires strict tact time given occasion is appropriate, but for the fan drive and other occasions, acceleration and deceleration time longer acceleration time and deceleration time can be given together.
8 What is regenerative braking?
If you lower the motor during operation command frequency, the motor becomes non-state synchronous generator running, while working as a stopper, which is called regenerative (electric) braking.

Sanjin Elevator: Elevator inverrter Basics(a)

Sanjin Elevator: Elevator inverrter Basics(a):    1, what is the frequency? The elevator inverrter is the use of power semiconductor devices will be the role-off frequency to another fr...

Elevator inverrter Basics(a)

   1, what is the frequency?
The elevator inverrter is the use of power semiconductor devices will be the role-off frequency to another frequency power conversion power control devices.
   2, PWM and PAM What is the difference?
PWM is the English Pulse Width Modulation (Pulse Width Modulation) acronym, according to certain rules to change the pulse width of the pulse train to adjust the output volume and a tone waveform by value. PAM is the English Pulse Amplitude Modulation (pulse amplitude modulation) acronym is changed according to certain rules pulse amplitude pulse train, to regulate the output value and a modulation waveform.
   3, voltage-and current-What is the difference?
elevator inverrter main circuit can be divided into two categories: voltage is converted to DC voltage source elevator inverrter AC and DC circuit filter is a capacitive; Current DC current source is converted to AC elevator inverrter, its stone DC circuit filter inductor.
   4, why the elevator inverrter voltage and current proportional to the change?
Induction motor magnetic flux and the torque of the motor and the rotor current flows resulting from the interaction between the rated frequency, if the voltage is fixed and only the lower frequency, then the magnetic flux will be too large, the magnetic circuit saturation, severe The burning motor. Therefore, the frequency and voltage proportional to a change, that is to change the frequency converter output voltage while controlling the motor to maintain a certain flux, to avoid weakening and magnetic saturation phenomenon. This control method is used for fan and pump energy-saving elevator inverrter.
   5, motor drive using frequency power supply, the voltage drop is current increases; For elevator inverrter-driven, if the frequency drops voltage drop, then the current is increased?
Frequency down (low), if the same power output, the current increases, but under certain conditions, the torque current is almost constant.
   6, using the elevator inverrter operation, the motor starting current, starting torque what?
Using elevator inverrter operation, with a corresponding increase in the acceleration of the motor frequency and voltage, the starting current is limited to 150% of rated current (according to different models, 125% to 200%). Labor-frequency power directly when starting current of 6 to 7 times, therefore, will have an impact on the mechanical and electrical. With elevator inverrter drive can smoothly start (start time becomes longer). Starting current for the rated current of 1.2 to 1.5 times the starting torque of 70% to 120% of the rated torque; For enhanced functionality with automatic torque converter, the starting torque of 100% or more, you can start with a full load.
   7, V / f mode What does it mean?
Frequency drops voltage V is also proportional to the decline, the question has been answered four instructions. The ratio between V and f are considered characteristic of the motor determined in advance, usually in the controller memory means (ROM) in that there are several features that can switch or the dial to select.
   8 and proportionate change V and f, the motor torque to change?
Down completely when the frequency is reduced proportionally to the voltage, the impedance becomes smaller as the DC resistance constant, would result in a low torque is generated under a reduced tendency to. Therefore, given the low frequency V / f, the output voltage is increased to make some manner so as to obtain a starting torque, this compensation called enhanced start. Variety of methods can be used, a method of automatically select V / f pattern or adjusting potentiometer and other methods.

Sanjin Elevator: elevator inverter selection principles

Sanjin Elevator: elevator inverter selection principles: Elevator inverter output power and current selection must be equal to or greater than the induction motor driven power and current      Be...

elevator inverter selection principles

Elevator inverter output power and current selection must be equal to or greater than the induction motor driven power and current
     Because elevator inverter overload no motor overload, once the motor overload, damage first elevator inverter (if the elevator inverter protective function is imperfect words); Also if the device has been selected motor power is greater than the actual mechanical load power, but users will be possible to achieve the mechanical power regulator motor output power, at this time, the drive must be competent, that the power of the elevator inverter selection must be equal to or greater than the motor power.
     Individual motor rated current value rather special, and not near the common standard, but also the motor rated voltage, rated current is too large, then the requirements of the elevator inverter rated current must be equal to or greater than the motor rated current.

Sanjin Elevator: Universal Converter Fundamentals

Sanjin Elevator: Universal Converter Fundamentals: This information refers to the universal elevator inverter for industrial and general elevator inverter motor universal motor by the genera...

Universal Converter Fundamentals

This information refers to the universal elevator inverter for industrial and general elevator inverter motor universal motor by the general power grid (single-phase 220V, three phase 380V 50Hz), elevator inverter for speed control. Such elevator inverter widely used in the industrial areas of the elevator inverter has become mainstream. The basic principle of speed based on the formula:
 
Formula (1): n1-synchronous speed (r / min);
f1-Stator frequency power supply (Hz);
       P-number of pole pairs.
General induction motor speed n and synchronization speed n1 exists a relationship between the slip
 
Formula (2) in: n-induction motor speed (r / min);
S-induction motor slip.
By the (2), we know that the method can change the speed f1, P, S which either reached the asynchronous motor is the best way to change the frequency f1, to achieve speed control.
By the motor theory, three-phase asynchronous motors rms per phase electric potential related with the following formula.
   
Formula (3): E1-Stator RMS per phase electric potential (V);
f1-Stator frequency power supply (Hz);
N1-effective stator winding turns;
Фm-stator flux (Wb).

Sanjin Elevator: Routine maintenance of elevator inverter

Sanjin Elevator: Routine maintenance of elevator inverter: Application has been common elevator inverter fans, pumps, etc. to expand to the food, beverage, logistics, building, and constantly open n...

Routine maintenance of elevator inverter

Application has been common elevator inverter fans, pumps, etc. to expand to the food, beverage, logistics, building, and constantly open new energy field, and its function has also been improved and diversified, one is fully digital, fully functional, able compensate for load changes adaptive, self-tuning technology, especially distributed communications, networking and integration of PLC-end elevator inverter; hand is a simple elevator inverter or industry-specific as well as mechanical and electrical integration, miniaturization lift inverter. In addition, new high-voltage power electronic devices because the advent of high-voltage and medium-voltage drive elevators also have made ​​great progress.

If you usually carry out maintenance on the elevator inverter, you can greatly decrease the failure rate of elevator inverter:

An elevator electrical room temperature is not too high, otherwise elevator inverter components easy to aging, preferably air-conditioned, the consequences quite good;

2, to prevent rain water, usually in a typhoon, the windows broken by the wind leaving the elevator inverter shower to rain;

3, lightning, this would relate to the whole building or all of the district mine facilities, so she was struck by lightning elevator inverter individual damage grim;

4, elevator inverter cooling fan to regularly clean the dust, elevator inverter repair method using DC resistance line voltage detection and measurement of both methods and found that there was a noise or exchange will not run;

5, elevator motors unusual noise is usually elevator inverter problems, such as motor phase current is not balanced, then the best will repair, it is not complete until the elevator inverter may be more severe damage.

Sanjin Elevator: How to improve the braking ability of the elevator...

Sanjin Elevator: How to improve the braking ability of the elevator...: In order to use the heat to dissipate regenerative power, you need to install the elevator inverter side of the braking resistor. To impro...

How to improve the braking ability of the elevator?

In order to use the heat to dissipate regenerative power, you need to install the elevator inverter side of the braking resistor.

To improve braking capacity, can not be expected by increasing the capacity of the elevator inverter to solve the problem. Please use the "braking resistor", "brake unit" or "power regeneration converter" and other options to improve the braking capacity of the elevator.

Sanjin Elevator: Elevator work

Sanjin Elevator: Elevator work: Traction rope ends were attached to the car and counterweight , wrapped in traction wheel and guide wheel, traction motor through ...

Elevator work

Traction rope ends were attached to the car and counterweight, wrapped in traction wheel and guide wheel, traction motor through reducer rotating speed rear wheel drive traction, traction rope by friction and traction sheave , to achieve the car and the counterweight lifting movement, to transport purposes. Fixed on the car guide shoe can be installed in the buildings along the hoistway wall fixing rail reciprocating movement at the car in operation to prevent skewed or swing. NC block brake on the motor work loose brakes, operate the elevator inverter in case of loss of power brake, stop the car and landing, and stand on the specified layer to maintain its quiescent state for personnel and cargo access. The car is carrying passengers or other load box member, the counterweight to balance the car load, reducing motor power. Compensation means for compensating movement of the traction rope tension and weight changes, so that the traction motor load stability, the car can be accurately docked. Electrical system to achieve the control of movement of the elevator, and complete layer selection, flat layer, speed, lighting work. Call system displays the car indicating the direction of movement at any time and location where the floor. Safety devices to ensure safe operation of the lift.

Sanjin Elevator: Elevator Safety Instructions

Sanjin Elevator: Elevator Safety Instructions: 1. Use the elevator, I want to go upstairs, please press the up arrow button, I want to go downstairs, please press the down arrow button. ...

Elevator Safety Instructions

1. Use the elevator, I want to go upstairs, please press the up arrow button, I want to go downstairs, please press the down arrow button.
2. Elevator parts - elevator floor, passengers should ascertain the direction of the elevator; when determining the direction of the elevator go in the same direction with their time re-entering the car.
3. Passengers can press the elevator operator panel on the "close button" to close the elevator door; elevator doors will be timed, automatically shut down in the floor and the car passengers not to stay at the seams to avoid being pinched.
4. Passengers from entering the car, the floor layer selection by pressing the OK button stops the elevator floor. Passengers must not rely on the car door.
5. Elevators are rated to carry the number of criteria. When a person is overloaded, the elevator alarm will sound prompt, then passengers should take the initiative attrition, exit the elevator.
6. When the elevator abnormality or malfunction occurs, the passenger should remain calm, you can call the car alarm call for help or wait for rescue. Must not be allowed to breaking, trying to escape from the car.
7. To maintain the cleanliness of the car, not the car smoking, littering anywhere.
8. Passenger elevator to care facilities shall be lightly press the button and the chaos pry the car door.
Management personnel should strictly fulfill their duties, always check the operation of the elevator; regular contact with elevator maintenance, good maintenance records; found fault timely processing and reporting.