Single-phase current transmitter is a kind of electric power test substation developed for the power measurement of single-phase communication in motor experiments on the basis of motor experiment and testing technology research, in accordance with IEC and relevant national specifications for motor experiments. The advanced filtering technology and reasonable software algorithm are used to solve the problem of low measurement accuracy and unstable measurement data of general appearance. The single-phase current power transmitter has low power consumption, high precision, light weight, and selects personalized planning, digitizes the front-end of measurement, and the output signal is digital, and the serial optical fiber bus method is used for transmission, and is assembled and handled by the distributed measurement and control master station, which has excellent voltage barrier ability and electromagnetic compatibility, and strong anti-interference. It is suitable for front-end power collection of distributed measurement and control test system.
Single-phase current transducers are characterized by:
1. High accuracy (typical: 0.2% zui is good and 0.05%);
2. The whole range has extremely high linearity;
3. High degree of integration, simple structure, excellent temperature characteristics and long-term operation stability, so that the transmitter is exempt from timing calibration.
The single-phase current transmitter converts the measured signal into a voltage, which is directly converted into a voltage that has an excellent linear relationship with the measured signal and is completely blocked by the HCNR200/201 linear optocoupler, and then passes through the constant voltage (flow) to the output. It has the advantages of very simple principle, concise line planning, high reliability, and convenient installation.
The single-phase current transmitter can directly convert the communication current in the main circuit of the test into a linear share output of DC 4-20mA (converted into DC 1-5V through 250Ω resistance or DC 2-10V through 500Ω resistance) constant current loop specification signal, which is continuously transmitted to the receiving device (computer or display appearance).
The primary and secondary sides of the single-phase current transmitter are highly insulated, and there are two-wire and three-wire output wiring methods. The three-wire transmitter has a positive end, a negative end and a signal output end of +24V auxiliary operation power supply;
The single-phase current transmitter has the characteristics of high precision, small size, low power consumption, wide frequency response, and anti-interference. The two-wire port has strong anti-induction lightning ability, and has the advantages of lightning wave and surge protection ability. It is especially suitable for intelligent monitoring systems for load currents such as generators, motors, intelligent low-voltage distribution cabinets, air conditioners, fans, street lights, etc.
The single-phase current converter has ultra-low power consumption, 0.096W when a single one is quiescent, 0.48W at full scale, and 0.6W with internally constrained output current.
|
More on that
|
Wiring of Reynolds frequency converters
1 Main circuit wiring
(1) Reynolds inverter three-phase AC input terminal (R, S, T)
The power input terminal is connected to the three-phase AC power supply through the circuit breaker of the circuit breaker for line protection, regardless of the connection phase sequence. It should be noted here that the three-phase AC power supply is not ...
|
|
Analysis and repair of inverter failure cases - Reynolds
1. The inverter can not speed up the frequency increase when it starts with load
The 1366S-BR 040 inverter carries a load of 37 kW fan motors. During the trial operation, it was found that the inverter could not speed up the frequency increase normally, and the HIM display was speeding up. The inverter only swings at 1-4 Hz, and the motor emits a buzzing ...
|
|
The object of protection of frequency converters in overload protection - Reynolds
Inverters are mainly divided into two categories according to the frequency conversion method: communication/DC/communication and communication/communication inverters. Here we take the widely used general "communication/DC/communication" as an example to briefly talk about its structure and operating principle. As can be clearly seen from the above diagram, the communication/...
|
|
Soft start uses common faults and solutions - Reynolds
In the process of daily use of soft starters, it is inevitable to encounter some improper use or failure of soft starters in the process of use
1. The user starts ...
|
|
Safety standards for AC drives – Reynolds
International electrical safety standards: The requirements are in line with international electrical safety standards, such as CE standards in Europe and UL specifications in United States. These specifications specify the requirements for electrical safety functions, mechanical safety functions, EMC functions, etc.
...
|
|
Advantages of frequency converters over soft start – Reynolds
(1) The starting torque is large and the power factor is high. Because the power factor of the motor is related to the working frequency, the power factor under the power frequency power supply is much lower than that under the low-frequency power supply when the motor is running at low speed. The inverter can control the motor from low frequencies and ...
|
|
Structural characteristics of Reynolds RHY series inverter governor
1. Advanced technology: (PC or PLC) is used to make the equipment complete the intelligent constant pressure variable supply water supply according to the requirements of water supply and fire protection;
2. High efficiency and energy saving: the system can set the pressure according to the demand, and the system can actively adjust according to the set pressure.
|
|
Key points for the selection of Reynolds servo motors
Each type of servo motor has additional torque, maximum torque and servo motor inertia and other parameters in the standard items, each parameter and load torque and load inertia must have a relevant connection, the output torque of the servo motor should meet the requirements of the movement conditions of the load organization, such as the speed of the acceleration ...
|
|
Features of the unit tandem inverter - Reynolds
(1) The multi-pronged PWM control method is selected, and the output voltage waveform is close to the sine wave.
(2) The rectifier circuit is multiplied, the number of pulses is as high as 36, the power factor is high, and the input harmonic is small.
(3) Modular design, compact structure ...
|
|
Two Reynolds technologies were included in the "2020 Water Conservancy Technology Key Promotion Catalogue"
In May 2020, Reynolds was recommended by relevant departments to apply for the Ministry of Water Resources's "2020 Key Promotion and Guidance Catalogue of Advanced and Practical Water Conservancy Technologies".
|
|
Classification and working principle of Reynolds inverter
Classification of Reynolds frequency converters:
There are many classification methods for Reynolds inverters, which can be divided into voltage-type inverters and current-type inverters according to the classification of the main circuit operation method; According to the classification of switching methods, it can be divided into PAM operation.
|
|
The difference between a soft starter and an inverter – Reynolds
The inverter changes the output frequency and voltage together, that is, changes the n0 on the motor running curve, so that the motor running curve moves parallel downward. Therefore, the inverter can make the motor reach its maximum torque with a small starting current, that is, the inverter can start the heavy-duty load.
|
|
Frequency converter overcurrent problem treatment - Reynolds
General treatment methods for inverter overcurrent problems:
The output side of the inverter is a PWM voltage waveform, and after passing through the motor winding, the output current is approximately a sine wave, and lags behind the voltage by a phase viewpoint, which is determined by the power factor of the motor. The output current of the inverter passes through ...
|
|
Applicable mode of inverter maintenance - Reynolds inverter
CNC cutting machine
1. Gradual reduction method
The so-called gradual reduction method is to narrow the scope of shortcomings step by step by elaborating the shortcomings and judging the measurement parameters.
|
|
The way to set the parameters of the inverter - Reynolds
There are many setting parameters of the inverter, and each parameter has a certain range of choice, and the inverter can not work normally due to the improper setting of a single parameter in use, therefore, the relevant parameters must be set correctly.
...
|
|
Frequency characteristics of Reynolds frequency converters
a. Output frequency scale. The output frequency scale that can be controlled by the general inverter, the lowest starting frequency is generally 0.1Hz, and the highest frequency is different according to the functional indicators of the inverter, generally 400Hz, and some models are 650Hz. No matter how high the output frequency is, it depends on the scale of the high-frequency inverter.
...
|
|
The main failure mode of mechanical parts – Reynolds
The top failure modes of mechanical parts:
Failure: The mechanical part cannot complete its normal function within the planning and booking period and under the regular conditions.
Ways in which mechanical parts fail: overall cracking, plastic deformation, corrosion, abrasion, gluing, and touch exhaustion
General ...
|
|
Inverter maintenance and undervoltage fault handling - Reynolds
In the repair of the inverter, we often hear about overpressure problems, but underpressure problems are also common problems encountered in the use of inverters. The reason is that the main circuit voltage is lower than the lower limit caused by the maintenance action or the damage of a rectifier bridge or the instantaneous power failure of the power grid, and the input is flat. Inverter after-sales ...
|
|
Inverter control method - Reynolds
The output voltage of low-voltage general frequency conversion is 380-650V, the output power is 0.75-400kW, and the operating frequency is 0-400Hz. Its control methods have gone through the following four generations. 1U/f=C Sinusoidal Pulse Width Modulation (SPWM) Manipulation MethodIts Characteristics ...
|
|
The difference between heavy-duty inverter and light-duty inverter
1. The starting time is different: light load generally refers to the small inertia of the equipment load, and the energy storage balance time of the demand for start-up is short, that is, the starting time is short. Heavy load generally refers to the long time of energy storage balance when the equipment load inertia is large and needs to be turned on, that is, the time of start-up.
2. The requirements for working current are not ...
|
|
Contact
working hours
