Allen Bradley's product industry returns to rational development

2023-01-19

No SF6 load switch and fuse protection, in line with the concept of energy conservation and emission reduction, in line with the requirements of social green development. Allen Bradley's product industry returns to rational development.

● It is used in the whole network, because the protection range of the three motors is 100 meters, and the current ratio 3KA should be installed to withstand both impact and impact.

● Short circuit protection is an important link for connecting power supply. Generally, one motor is sent to multiple motors at the same time, which has certain protection purpose for common faults of multiple motors. Therefore, in case of short circuit jamming, it can be displayed by the ammeter. In case of short circuit, the wires will be arranged (such as live and short circuit).

● In case of short circuit load fault, the first thing to be observed is that the brake air is opened or turned on, and there is an emergency value. If the resistance of the electric braking system is too high, the performance and service life of the electric braking components will be affected, that is, the heating will be too fast or too slow. In this case, the brake air can be covered properly during maintenance to avoid thermal runaway and long installation time of brake air.

● Open the protective cover of the reduction motor and check the guide hole of the positioning shaft of the gear box. If there is a sharp edge or a rubber locator is scratched, a good prompt will be given to prevent the failure.

● If there is no buffer gas in the brake gas base, it may also be the buffer gas of the frequency converter. Find a professional decelerator brand to see if there is any fault.

● At this time, open the cover plate of the distribution box. If the internal components are too large, they will also trip. The quality of motor replacement is poor, which will cause the frequency converter to trip.

● Let the frequency converter be grounded (grounded). Although it is not grounded, the shaft handle of the motor is used for grounding and preventing grounding.

● Install overvoltage protector at the water inlet end of the frequency converter. When the capacity reaches a certain voltage (13ms per minute), conduct internal detection first and then detection. 3. Check whether the output voltage of the frequency converter reaches the maximum voltage (it is the output voltage).

● No damage to the rectifier module is detected, but the rectifier module is damaged. The static damage of IGBT can be known from the above tests. Because the static contact resistance of the DC drive board is low, the voltage drop on the resistance occurs on the varistor during discharge.

● The rectifier module is generally damaged with the following disadvantages: 1 wire connection fault; 2. It cannot be solved by increasing the trigger circuit voltage.

● Connection, drilling and installation of amorphous alloy transformer and thin silicon metal oxide conductor 4. Annealing 5. Oil tank, water tunnel grinding and polishing and other difficult operating conditions.

With the rapid development of technology and chemical industry, the demand for dry-type transformers is growing. The same energy-saving and environmental protection equipment is also regarded as occupational kowtow, dislocation, abnormal conditions, etc.

The oil tank structure of European transformer, with the capacity of oil tank and box generally below 100kVA, varies from one for use to one for standby. The transformer can be dedusted and vacuum baked without organic process, but vacuum drying can also be used to avoid aging of some insulating oil and penetration of cloth bags. If the oil tank leaks, replace the sealing ring.

In order to prevent shell collision caused by cavitation bulge explosion and sealing form, especially the withstand voltage test of casing, high-temperature resistant epoxy resin shall be selected and vacuum pump box shall be added. The medium shall pass the high-pressure vacuum pump and withstand voltage test. For contact safety, the leakage point and leakage shall be considered, and materials with different temperature resistance shall be selected for testing.

● When the gas leaks to a certain extent (except for the leakage point and leakage point), the transformer of the component shall be reported immediately and coordinated with the component.

● The internal, external and arc gaps of the relay are uneven. At this time, the insulation terminals (such as arc contacts) of the controlled electrical equipment are not vertical.

● Air trip and relay are voltage relays, which do not directly contact the surface. Its interior is the core of the transformer excitation system, so there is a high magnetic flux density. When the voltage level of the transformer excitation system reaches low voltage, the relay acts to switch the power supply voltage on or off.

● The voltage relay is a voltage relay, which connects the power circuit continuously when the primary winding of the transformer passes through.

When the voltage relay does not act, but the transformer is connected, the relay returns. When the transformer cannot be cut off at one time due to unstable voltage, the relay returns and operates normally again after returning.

● The voltage relay cuts off the power supply of the motor at one time. Compared with the low-voltage transformer, the action time and time base of the current relay have been significantly improved.

● Relative to the primary circuit, the voltage value of the voltage relay remains unchanged within a certain voltage range (± 5%), that is, when the rated current is below 1A, the action time is microseconds.

● Classification according to action characteristics: DC contact contactor, two normally open contacts, normally closed contacts, etc.

● Classification by contact form: DC contact contactor, DC relay, micro signal contact, 1-circuit action NPN/PNP.

● Classification by connecting wires: single layer 2, multi-layer 3, star code (SEN), multi-layer 4, star code (Low).

● It can be divided into silver ash (silver ash), silicon ash (low grade Al) and silicon carbide (APD) according to the color of connecting wires.

Due to the different connection methods with other power grids to a large extent, the plug connection in China can be divided into: crimping type, lug type, flange type (except plug-in type), bus type and flange type (except plug-in type) according to different voltages.