The low-voltage fuse cannot be used as an overload maintenance for the motor.
It is necessary that the additional voltage of the fuse is greater than or equal to the operating voltage of the distribution line.
The additional current of the fuse must be greater than or equal to the additional current of the melt.
The breaking ability of the fuse is necessary to be greater than the large short-circuit current that may occur in the distribution line.
For the selection of the additional current of the melt, it is necessary to satisfy the normal operating current of the line and the starting current of the motor.
For short-circuit maintenance of loads such as electric furnaces and lighting, the additional current of the melt is equal to or slightly greater than the additional current of the load.
For a single motor, the melt extra current ≥ (1.5-2.5) motor extra current.
The melt extra current is in the distribution system, and the upper and lower levels should work together in harmony to accomplish the selective maintenance intent. The next level should be smaller than the previous level.
The porcelain plug-in fuse should be a straight device, and it is necessary to use a qualified fuse, and other copper wires should not be used instead of fuses.
The power inlet of the spiral fuse should be connected to the center terminal block of the base, and the outlet wire of the load should be connected to the terminal block of the threaded housing.
When replacing the melt, it is necessary to disconnect the electrical equipment first to prevent arcing.
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The specific operation method of Delta inverter
(1) When the speed of the motor is controlled by the Delta inverter, the noise and temperature rise of the motor are higher than that of the frequency of the motor. When the motor is working at low speed, due to the low speed of the motor blades, the temperature rise of the motor becomes high.
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The key point to pay attention to when choosing a UPS power supply - Delta
(1) About the synchronous switching function. Now, in addition to the off-line UPS power supply with an additional output power of less than 500VA, the off-line UPS power supply with square wave output is still selected for conversion control without mains synchronization function, and all UPS power supplies with an output power of 1KVA and above are performing the conversion operation of mains power supply to inverter power supply.
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Analysis of communication problems of Delta inverters
Problem Clarification:
Communication Transmission Timeout: The Modbus transmission between the VFD and the Keypad times out
Solution:
VFD does not respond to Keypad's communication commands.
1. Confirm the communication quality of the communication wiring and contacts.
2. Please use the RESET key to clear the Fault ...
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Touch screen controls the inverter step – Delta
1. The touch screen is controlled by PLC inverter
1. At present, the general control of the inverter needs to choose PLC to communicate with the inverter, read the information of the inverter, and then the touch screen communicates with the PLC to complete the control of the inverter to start, stop, and monitor the operation of the inverter.
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Introduction to the features of Delta's power modules
1) Brief planning. Only one battery module, paired with several discrete components, is able to obtain a battery.
2) Shorten the development cycle. It is generally equipped with a variety of input, output, and battery module options. Users are also able to repeat or cross-stack, combined with modular batteries, to complete multi-channel ...
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Delta inverter failure and maintenance
Delta's inverter problem 1: Communicate with the motor driver to explore the formation of overvoltage conditions on the internal DC high-voltage power supply side
Check whether the keyed operating voltage is in the field of the additional value of the communication motor driver keying operating voltage, and detect whether there is a surge operating voltage formation
If it is due to ...
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Detection methods for Delta circuit breakers, AC contactors and frequency converters
1. Circuit breaker
A circuit breaker is a device that can be manually or automatically controlled, and is used to control the on/off of the system power supply in the equipment circuit system. When there is a suspicion that there is a defect in the electrical system of the equipment, the primary functional part of the power supply should be checked.
Under normal circumstances, when in the ON state, the input input ...
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Workarounds for industrial tablet PC disk failures
After the long-term operation of the industrial tablet, there is a lot of dust in the chassis and the temperature of the chassis is high. At this time, it is very simple to cause the disk failure of the industrial tablet computer, the product quality problems of the hard disk itself and the failure problems caused by the working environment.
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Ways to reduce the failure rate of Delta drives
If you want to reduce the fault rate of Delta inverter, it is necessary to check it daily, and what are the detailed items?
Delta inverter fault repair ...
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Introduction of incoming reactor for inverter - Delta
Reactors are also called inductors, and when a conductor is energized, a magnetic field will be generated in a certain space scale occupied by it, so all electrical conductors that can carry current have inductance in a general sense. However, the inductance of the energized long straight conductor is small, and the magnetic field generated is not strong, so the actual reactor is conductive.
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The inverter sets the characteristic parameters of the motor
1. Parameters to be set for the motor
When the inverter (hereafter referred to as the -VFD) is operating in the "vector control" (F0-03=1) mode, it is highly dependent on accurate motor parameters, which is one of the important differences from the "VF controlled" (F0-03=2) mode. In order for the VFD to have outstanding driving ...
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Introduction to common models and parameters of Delta touch screens
There are many types of Delta contact screens, of course, the parameters of different types are different, and the most important product is DOP-B03S201. This product is a 4.3-inch screen, its aspect ratio is 16:9, the screen is made of TFT raw materials, and its resolution can reach 480X ...
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What are the series of Delta inverters?
1:VFD-EL,VFD-S,VFD-L,VFD-C200
Voltage 220V, 380V, power scale 100W-7.5kw
The above series are Delta's simple inverters, commonly known as economical inverters, which are used for small fans and pumps, conveyor belts on food and pharmaceutical machinery, etc., and are used for abbreviated ...
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Characteristics of common models of Delta inverters
Delta MS300 Inverter Series: Delta's compact standard vector-operated inverter MS300 combines the advantages of miniaturization, high functionality, high trust, and simple installation, transforming every investment in industrial resources into abundant results. Optimized structure with lock-free screw terminals to plan the supply of bento ...
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EMC Filter Installation Considerations – Delta
All electronic equipment (including frequency converters) will generate some high-frequency or low-frequency noise during normal operation, and disturb the peripheral equipment through conduction or radiation. If the right EMC filter can be configured and the correct device method can be used, the disturbance can be reduced to a minimum. ...
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The basic control loop of Delta's inverter
There are two fundamental circuits for communicating with external signals: analog and digital:
1. 4-20mA current signal loop (imitation); 1 - 5V/0 - 5V voltage signal loop (imitation).
2. Switch signal circuit, inverter start and stop command, forward rotation command, etc.
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New and old models of Delta drives
Delta's VFD series of inverters has established a wide brand awareness in the industrial automation market. Each series of products is designed for different operation needs such as torque, loss, overload, overspeed work, etc., and is adjusted according to different industrial machinery attributes; It can provide customers with the most diversified choices ...
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Excessive inverter capacity poses a hazard to electrical equipment – Delta
(1) The harmonic current will directly cause the additional heating of the motor, so that the stator of the motor will exceed the rated temperature rise of the motor itself, so that the rated output capacity of the motor will be greatly reduced.
(2) The current wave output of the inverter ...
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Delta's Ultron NT series UPS escorts flight safety at international airports
The rapid development of the national economy has opened up a broad shopping mall space for the growth of the civil aviation industry. In order to meet the surge in the number of flights, an international airport in Northwest China has invested in the third phase of the expansion project, and has been listed as the "number one project" for civil aviation development and the "benchmark demonstration project" for national civil aviation.
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Advantages of sensorless vector control - Delta inverter
Excellent open-loop speed control without slip compensation
There is high torque at low degree, so there is no need to supply too much torque to enhance c. Lower loss, higher power
Higher power echoes – especially for stepped loads
Big...
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