1. Determine the type and maintenance situation of Schneider circuit breaker according to the maintenance requirements of the line, and determine the selection of frame type, device type or current limiting type. Generally speaking, the short-circuit current breaking ability of Schneider frame circuit breaker is larger and larger than that of device type. Generally, non-selective two-stage maintenance (overload delay and short-circuit instantaneous maintenance) is used for branch lines, and device-type circuit breakers are mostly selected; The branch line selects overload delay and short-circuit short-delay maintenance, and can choose non-selective two-stage or selective three-stage maintenance, depending on the requirements of its level cooperation; The maintenance of the trunk line (power supply head) is the main maintenance, and the main circuit breaker should be selected in line with the criteria of reducing the scale of failure and maintaining reliable maintenance.
2. The additional voltage of the Schneider circuit breaker should be equal to or greater than the additional voltage of the line to be maintained.
3. The additional voltage of Schneider circuit breaker and undervoltage tripper should be equal to the additional voltage of the line to be maintained.
4. The additional current of Schneider circuit breaker and overcurrent tripper should be greater than or equal to the accounting current of the line to be maintained.
5. The limit segmentation of the circuit breaker should be greater than the effective value of the maximum short-circuit current of the line.
6. The maintenance characteristics of the upper and lower circuit breakers in the distribution line should be coordinated and cooperated, and the maintenance characteristics of the lower level should be located below the upper maintenance characteristics and do not intersect.
7. The long-delay trip current of the circuit breaker should be less than the allowable continuation current of the wire.
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Fault check steps for frequency converters - Schneider frequency converters
1. Check whether the appearance of the inverter is in good condition, including whether the indicator light is running normally, whether the task control function of the operation panel is complete, and carefully observe the appearance of the inverter in the operating state, and do the corresponding recording work; When repairing the inverter, check whether the voltage value and current value exceed the allowable ...
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AC-DC inverter composition and function - Schneider
The AC-DC inverter main circuit consists of three components: the rectifier main circuit, the center circuit and the inverter circuit.
1. The main circuit is the power replacement part that provides voltage regulation and frequency regulation power supply for the asynchronous motor, and the main circuit of the inverter can be roughly divided into two categories: the voltage type is the voltage source ...
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Key points of operation of Schneider disconnectors
Features of Schneider Barrier Switch: First of all, Schneider Barrier Switch can be used to block the power supply, it can disconnect the live equipment from the high-voltage maintenance equipment, and can also see the obvious disconnection point on it. Secondly, Schneider barrier switches can cooperate with circuit breakers to change the operation of the system.
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Is there a restriction on the installation direction when Schneider installs the inverter?
It should be basically stored in the plate, the problem is that the plate with a fully enclosed structure is large, takes up a lot of space, and the cost is relatively high. This can be done by:
(1) The planning of the disc should be based on the heat dissipation required by the actual device;
(2) Profit ...
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Circuit breaker failure protection - Schneider
Circuit breaker failure maintenance refers to the relay maintenance action of faulty electrical equipment when the trip command is announced and the circuit breaker refuses, the maintenance action information of the faulty equipment and the current information of the rejected circuit breaker constitute the judgment of circuit breaker failure, and other related problems in the same plant and station are cut off in a shorter time limit.
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Schneider UPS power supply common fault analysis
1. When there is mains power, the UPS output is normal, and when there is no mains power, the buzzer beeps for a long time and there is no output
Fault analysis: From the phenomenon to identify some problems of the battery and inverter, you can view it according to the following procedures:
1. Check the battery voltage to see if the battery is undercharged.
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Safety PLC is different from ordinary PLC
A safety PLC differs from conventional PLCs in that it needs to be certified for safety by a third-party professional organization and meet stringent international standards for safety and reliability. There is a need for a thorough systematic approach to the planning and testing of safety PLCs. TUV*** in Germany and FM*** in United States ...
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Schneider AC inverter usage category
Under the IEC60947-4 standard, the Schneider communication contactor TVR series must be able to turn on and break the current value, and these currents depend on the type of break that the load is turned on, including squirrel cage or slip ring motor, resistor, when the switch or break is generated in the motor abort, start or run...
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How to operate the transformer DC resistance tester – Schneider
1. The instrument test has a total of YN winding three-phase test, YN winding three-phase phase-by-phase test, low-voltage winding magnetization method test of iron-core five-column low-voltage angular transformer, low-voltage winding phase selection test and general four-terminal method of ironcore three-column low-voltage angular transformer.
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The difference between circuit breaker and air opening - Schneider
An air switch, also known as an air circuit breaker, is a type of circuit breaker. It is a switch that only needs the current in the circuit to exceed the rated current will be actively disconnected, and is generally used to avoid circuit overload and short-circuit maintenance (some also have low voltage maintenance functions) can not maintain electric shock, to put it bluntly, it is ...
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How long does a UPS power supply last after a power outage – Schneider
The UPS power supply can supply power for a period of time after the power is cut off, but how long can the UPS power supply be powered after the power outage? UPS power supply manufacturers said that the power supply time of UPS power supply is inconsistent according to the load power, the number of batteries and other factors.
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Schneider XPS safety control module selection method
(1) Evaluate the safety control level that the machinery and equipment need to reach
(2) Confirm the type of input signal to be monitored
and (3) the number of input signals that need to be monitored
(4) The number and type of channels that the module needs to output
(5) Whether it is necessary to control the output device (such as ...
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Schneider circuit breaker maintenance method
1. Insist that the air is moist or unclean, and the pipes are not clean, which may have the following consequences:
(1) The wet gas is decomposed into mixed gases such as hydrogen and oxygen under the effect of arcing, destroying the insulation between the fractures after the main contact is broken, which is difficult to arc or arc re-ignition, and in severe cases, arc extinguishing will be formed.
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Maintenance of multiple models of Schneider inverters
Schneider inverter our most common problem is that the power is not visible, the series of inverter switching power supply uses a UC2842 chip as a waveform generator, the damage of the chip will lead to the switching power supply can not operate, so that it can not be displayed normally, in addition, the operating power supply of the chip is not ...
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Schneider disconnector operation inspection contents
(1) Whether the closing condition of the isolation switch is not defective, and whether there is any failure or dislocation;
(2) The porcelain insulation of the isolation switch should be free of defects, no cracks, no discharge phenomena and flashover traces;
(3) Contact inspection: a. Check the contact ...
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Common analysis method for electrical control line faults - Schneider
1) Survey and research method. The investigation and research method is to understand the obvious problem phenomena through "seeing", "listening", "smelling", "touching" and "asking"; After visiting the operator, understand the cause of the failure; A common way to help find the fault point after asking others or consulting information ...
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Schneider ATV71 selection and letter meaning
The type of Schneider inverter generally reflects the rated voltage, rated power, and load requirements of the inverter (heavy or light load).
Here are two examples:
Example 1:
Schneider Inverter Type: ATV71HD11N ...
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Analysis of common problems of Schneider inverter
1. Use the analog output port to indicate the motor frequency, when the motor frequency is 50Hz, why is the output only 16mA?
Because the maximum output frequency parameter of the inverter is "TFR", the factory default value is 60Hz. So when the inverter output is 50Hz, the analog output is 16mA. At this time, only ...
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Schneider Electric Innovation Summit "The future is digital"
The name of a company's product was mentioned more than anyone could remember, but on the first day of the Schneider Electric North America Innovation Summit in Atlanta on Tuesday, another word appeared even more often ...
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Schneider electrical circuit control fault range
In general, depending on the phenomenon of equipment problems, the scope of the problem can be roughly confirmed as follows:
1) All button functions fail, and there is a high possibility of power supply or fuse problems.
2) Some buttons are invalid, and some of the buttons are functioning normally ...
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