1. The wires of the inverter control circuit should be strictly distinguished from the main circuit cable (power line) and placed separately. This effectively prevents the inverter's control circuit from being disturbed by harmonics in the inverter's main circuit.
2. The connection of the inverter should be separated from the terminals or contacts of other control circuits, so as to prevent high-voltage breakdown. Due to terminals such as faulty signals and multi-function contact output signals of the inverter, it is very likely to drive high-voltage AC contactors/relays.
3. In order to prevent the wrong operation caused by the disturbance signal, when wiring the low-power control loop of the inverter (such as the wire used by the sensor under the PID control function), the shielded wire and twisted pair with high-quality anti-disturbance ability should be selected. And it should be separated from the main circuit and the strong current circuit (including the 200V relay program circuit).
4. Take the wire length of the inverter control loop of 50m as the reference point (in some cases, the length is 100m, which is related to the decisive factors such as the wire cross-section, raw materials, signal strength and so on), once the wiring interval is higher than the length, the signal should be amplified with a relay circuit or relay.
5. When crimping the inverter to control the circuit wire, it is necessary to pay attention to the polarity of the analog signal to prevent the destruction of the electronic circuit of the inverter's auxiliary control due to the opposite polarity.
6. When the inverter is energized, the digital multimeter with the buzzer function file (the output voltage of this gear is higher than other gears) is disabled to carry out on/off measurement of the control circuit, the reason for this is to prevent the power in the digital multimeter from being transmitted to the inverter control terminal through the meter pen, resulting in malfunction and faults!
7. Because the frequency input signal of the control circuit is a small current, in order to prevent problems caused by poor contact when the node is input, two parallel nodes or twin nodes should be used for the small signal contact.
8. The wiring of the control loop is generally 0.3-0.75 square meters of cable.
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Lightning protection measures for Reynolds frequency converters
The lightning protection measures of the inverter equipment are another important peripheral measure to ensure the safe operation of the inverter, especially in the area where lightning is active or in the lively season, this problem is particularly important.
Today's inverter products are generally equipped with mines.
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Inverter composition and various functions - Reynolds
Rectifier circuit: rectify 50HZ communication power into direct current.
Frequency conversion circuit: The rectified direct current is inverted into a variable frequency communication current.
Control part: control the frequency of communication electricity output by the inverter circuit.
Maintenance circuit: maintenance and blockage of overcurrent and phase loss ...
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The cause of bearing noise in different situations of frequency converters - Reynolds
1. If the bearing is in good continuous rotation condition, it will emit a low whining or humming sound. Sharp hissing, squeaking and other irregular sounds often indicate that the bearing is in a bad continuous rotation condition. The sharp squeaky noise can be due to the formation of an inappropriately smooth ...
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The basic principle of vector control – Reynolds frequency converters
The fundamental principle of vector control is to control the excitation current and torque current of the asynchronous motor according to the principle of magnetic field orientation through the measurement and control of the stator current vector of the asynchronous motor, and then to achieve the purpose of controlling the torque of the asynchronous motor. Specifically, it is to ...
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The difference between "braking" and "parking" of the inverter - Reynolds
There are two types of inverter parking.
One form is called "free parking". As the name suggests, it is to quickly "power off" the motor, so that the motor can slide and park by its own inertial force (OFF2 parking);
The other form is called "brake parking". So this "brake parking ...
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Reynolds drive safety rules and warnings
The high-voltage inverter has been designed with the safety of the user in mind. However, due to the energy storage capacitor installed inside the power unit of the inverter, it may still carry a high voltage after disconnecting the power supply, and some parts generate a lot of heat, so contact is prohibited. When working on or near the inverter, please ...
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The inverter prepares the braking resistance factor – Reynolds
The preparation of the braking resistor of the inverter is mainly to consume part of the energy on the DC bus capacitor through the braking resistor to avoid the capacitor voltage being too high. Theoretically, if the capacitor stores a large amount of energy, it can be used to release it to drive the motor and avoid energy waste. However, the capacitance of the capacitor is ...
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Reynolds inverter control method
The actuator commonly used in the industrial field of Reynolds inverter has good speed regulation performance and simple and convenient operation method. Therefore, it is widely used in the automation system.
Typical wiring method for the main circuit of a Reynolds frequency converter
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Common faults and solutions of vector inverter - Reynolds
The following faults may be encountered during the use of the inverter, please refer to the following methods for simple fault analysis:
1. No manifestation at power-on:
1) Use a multimeter to check whether the input power supply of the inverter is consistent with the rated voltage of the inverter, and check the cleaning problem.
2） ...
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Introduction to soft starters and their relationship with frequency converters - Reynolds
When the high-power motor starts, the current is large, which will cause the grid voltage to be seriously shaken, in order to deal with this problem, the general requirements for speed regulation are not high, and the soft engine can be used to reduce the voltage and start. However, the drop in the starting current when the step-down is started will also make the starting torque drop significantly.
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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.
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The cause of the heating of the inverter of the special machine
1. Problems of the inverter and the motor itself;
After the motor has been used for a long time, it cannot be ruled out that the insulation function is not good, or the bearing is stuck, and it may show a large current and heat. The coupling between the motor and the load may also be worn, or the motor is unbalanced in three phases, and the fixtures of the motor are loose.
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Reynolds inverter code function description
F09 second acceleration time 0.10 - 999.9sec; 5.0sec； △** The acceleration and deceleration parameters and the second acceleration and deceleration parameters are switched by terminal X3 (see F55);
F10 second deceleration time 0.10 - 999.9sec; 5.0sec； △**Acceleration and deceleration parameters and the second acceleration and deceleration parameters are switched ...
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The Reynolds booth was presented at the Industrial Automation Exhibition Center in Parma, Italy
Shanghai Reynolds Technology Co., Ltd. is an enterprise specializing in the design and production of high and low voltage soft starters, high and low voltage variable frequency speed regulation, intelligent electrical, new energy electrical and high and low voltage power transmission and transformation equipment, which are widely used in electric power, metallurgy, petroleum and petrochemical, military, mining, chemical industry, ...
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Inverter selection conditions and precautions - Reynolds
1. When selecting the inverter, select the inverter with the appropriate control method according to the load characteristics
In addition to the inverter manufacturing process, it is also important to choose which control method of the inverter. The control method of the inverter is mainly divided into two types: open-loop control and closed-loop control. In the meantime, the open-loop control method ...
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Inverter speed regulation method - Reynolds
1. Pole change logarithmic speed regulation method
This speed regulation method is to change the number of stator poles of the cage motor by changing the connection method of the stator winding, so as to reach the intention of speed regulation; The wiring is simple, the control is convenient, and the price is low; It can be used in conjunction with pressure and speed regulation, electromagnetic slip clutch to obtain high efficiency ...
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Inverter: The right inverter to use - Reynolds
Low pressure issues
The VFD reports a low voltage issue when the drive's DC link voltage drops below 62% of the nominal level at the high setting (480 Vac) and 50% of the nominal value at the low setting (400 Vac).
The +10% and -15% voltage tolerances in most manuals are the ones that claim to be ...
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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/...
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There will be problems with the inverter left for a long time - Reynolds
Most inverter brand products can rely on the heat generation of internal electrical components to remove moisture during normal use. If you don't have to do it for a long time, it's easy to get wet. The chip pins, penetrating resistors, capacitors, and inductor pins of the DIP package will be severely rusted or desoldered, resulting in on-resistance ...
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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".
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