Cncelegroup Troubleshooting "Resist" faulty judgment and handling

Happen "Resist" The situation is basically the closing operation and reclosing process. The dangers of such a large failure, for example, in case of an accident requires emergency backup power input, if the standby power switch on the circuit breaker to refuse, it will expand the accident. Judgment CNC Electric‍ circuit breaker "Resist" the causes and treatment generally three steps.

1) Check before closing time refused whether caused by improper operation (such as control switches let go too fast, etc.), and then combined with a control switch once again.

2) If the closing is still not successful, check the electrical circuits of each part, so as to determine whether faulty electrical circuit. Check the project are: closing control power supply is normal; closing closing loop control circuit fuse and the fuse is good; closing of the contactor contacts is normal; the control switch to the "switch on" position, look at closing core action is normal.

3) If the normal electrical circuit breaker is still not closing, then to mechanical failure, should be discontinued breakers, report scheduling maintenance treatment.

After more than a preliminary examination can determine electrical connection, or mechanical failure. Common faults and mechanical failures of electrical circuits are described as follows.

A common fault electrically

If the closing operation before the red, green not lit, AC Contactors‍ no power or control loop control has broken phenomenon. You can check whether the power and control of the entire control loop of the normal component, such as: operating voltage is normal, the fuse is blown, anti-hop relay is normal, the breaker auxiliary contact is good contact and so on.

When the operation switch on the green light flashes, and the red light does not shine, instrument no indication, horn sound, mechanical breaker points, closing position indicator is still in the OFF position, then the position of the operating handle position and the circuit breaker does not correspond breaker is not closed. The common causes are: closing the loop blown fuse or bad; closing the contactor is not activated; closing coil failure.

When the operation after closing the circuit breaker, the green light is off, the red light goes off after momentary bright, green light flashes and there is also the horn sound, indicating that the circuit breaker is closed and then automatically tripped. The reason may be caused by a circuit breaker protection combined current transformer‍ mechanical failure or circuit breaker tripping the circuit breaker can not be maintained in the closing state on the fault line.

If the green light flashes when the operation switch on or off, the red light does not shine, but there is indication meter, mechanical points, closing position indicator in the closing position, indicating the circuit breaker is closed. Possible causes are poor contact breaker auxiliary contacts, such as normally closed contact is not disconnected, normally open contact not closed, resulting in green and red light does not flash light; also may be electri calmete‍ closing or closing red burn circuit break .

Circuit breaker Maintenance

In order to make the main circuit breaker is in good working condition, maintenance and management must be strengthened.

1. Keep the air moist or dirty, do not clean electri calmete‍ the pipeline, are likely to cause the consequences:

(1) wet gas under the arc decomposed into a gas mixture of hydrogen and oxygen, destroy the main contact points between the insulation fractured fracture is difficult or arc reignition, can cause severe interrupter burst.

Breaker

(2) support insulator and arc interior cavity insulation strength decreases, resulting in surface discharge.

(3) in the pipeline patent leather, rust residue and other foreign objects that may block air intakes, the main circuit breaker operation failure occurs niche phenomenon.

(4) If the foreign body into the arc chamber, the main contact may cause a bad connection, due to long-term power nonlinear resistance and burning, can cause severe nonlinear resistance porcelain burst.

Therefore, in the intake manifold of the main circuit breaker equipped with air storage tank water separator, the lower part of the release valve, should be used to maintain current transformer‍ regular road drainage to maintain clean air.

2. Regular replacement of rubber parts

Main circuit breaker is a complex structure of pneumatic electrical, sealing performance of the components are higher, in order to ensure good sealing performance, rubber parts should be changed regularly.

3. Regularly check the main components

Main components should be checked regularly to maintain good technical condition.

(1) interrupter

Main contact on a regular basis to detect and moving contacts overtravel spring recovery state, dynamic and static contact due to open, close frequently due to friction and wear, resulting in over-travel is reduced, the contact pressure is reduced. When overtravel is reduced to a certain extent, to replace the dynamic and static contact. Moving contact spring deformation recovery exceeds a certain limit, must be replaced.

(2) non-linear resistance

Maintain internal nonlinear resistance porcelain clean, circuit breakers‍ sealed, regular replacement of non-linear resistance porcelain desiccant. Varistor detect the resistance exceeds a certain limit, the resistance changes must be replaced.

(3) the main valve

Periodically check with the size of the piston and the valve between the size does not meet the requirements should be replaced.

Appropriately adjusting the drive air cylinder buffer, to ensure good isolation switch operation. Periodically check the accuracy of the piston and the cylinder between tie by trimming or replacement parts to ensure its good operational performance. (4) Transmission air cylinder

(5) Ventilation cock

Must be replaced periodically door filler plug, plug detect CNC Electric‍ ventilation doors, be adjusted to within the allowable range.

electric transformer Energy units of measurement

Watthour meter kW · h (commonly known as the 6 th degree on the numerical representation of the use of electrical power 1kw power consumed by work 1h 1kw.h = 3.6 × 10's)

Reactive power meter kvar · h

Word round counters and window Air circuit breaker‍ (LCD window):

Different colors and decimal integer bit in the middle of the decimal point; each word wheel has a multiplication factor (no decimal point) LCD multi-function table bit integer and two decimal places

Accuracy:

Relative error, with placed Circled numbers represent

Calibration current and rated maximum current:

Rated current: indicated in the above table is electri calmete‍ calculated as the base load current value: I b. Usually calibrated current meter shall be 0.005 times the starting current. A calibrated current meter is larger, the smaller the error when electricity metering.

The maximum rated current: meter long term work, errors and temperature to fully meet the requirements of the maximum current value: Imax Rated voltage:

Single-phase energy meter mark: 220V

There are three three-phase meter mark law:

. a direct access to the three-phase three-wire: 3 × 380V

. b direct access to three-phase current transformer‍ four-wire: 3 × 380 / 220V

Proportional relationship between the number of wheel revolutions or power and energy meter records the number of pulses:: meter constant r / kWh; imp / kWh

Rated frequency: 50Hz‍

Circuit breaker Linear Regulator

LDO is a linear regulator. Linear regulator used in its operation within the linear region of the transistor or FET, the excess is subtracted from the Power Transformer‍ application of the voltage in the input voltage to generate a regulated output voltage. The so-called drop voltage regulator means that the output voltage is maintained within the minimum input voltage and output voltage difference between the upper and lower its rating required 100mV. Positive output voltage LDO (circuit breaker ) regulator typically use power transistors (also referred to as pass-through device) as the PNP. This allows the transistor is saturated, so the regulator can have a very low dropout voltage, typically about 200mV; In contrast, the use of composite NPN power transistor traditional linear regulator drop of about 2V. Negative output LDO use NPN as its transfer equipment, its operation mode and the positive output of the LDO PNP devices similar.

Updates development using CMOS p‍ower transistors, Electric transformer‍ which can provide the lowest dropout voltage. Using CMOS, only by the regulator power supply voltage drop is the load current ON resistance caused. If the load is small, the pressure drop generated in this manner only a few tens of millivolts.

Laser cutting machine with regulator

According to the requirements of high-power laser cutting machine, should be strictly in line with the regulator to develop a laser cutting machine, designed to stabilize the AC voltage and developed energy-saving products. When the power distribution network voltage fluctuations or load changes, can automatically ensure a stable output voltage. Must have a large capacity, high efficiency, wide voltage range, no additional waveform distortion and phase shift, the strain time fast, smooth and so on. Short circuit, mechanical failure, such as improving police protection, Inverter Power Supply‍ while the volume as much as possible to be compact and easy to use.

electric transformer Regulators Product structure

Regulators picture a typical switched-capacitor converter comprises four large MOS switch, which switches the order of a typical switch, doubling or halving the input supply voltage. Air circuit breaker‍ Energy transfer and storage provided by an external capacitor, for example with the Chinese company isolation transformer products on the market environment, production management, import and export products, industry investment environment and sustainable development issues on the basis of industry trends and make the analysis and prediction of qualitative and quantitative. In transformers, electric transformer, voltage regulators and other low-voltage products supporting the production, development, sales, "adhere to corporate innovation, the main products are: SBW power compensation for electricity regulator, SBW-F sub-tone regulator, SVC precision automatic exchange regulator, sophisticated purification regulator, the microcomputer non-contact voltage regulator, SG \ SBK isolation transformer, OSG \ QZB autotransformer, ZSG \ ZDG rectifier transformer, SSG servo transformer, DN resistance welding cooled transformers, reactors, contact auto voltage regulator, voltage regulators and other high-power electric pillar electrical equipment. product design, small size, attractive appearance, with electric energy meter‍ a low loss, low noise, impact resistance, etc. Widely used All applications need to guarantee the normal voltage in the mining industry, textile machinery, printing and packaging, petrochemicals, schools, shopping malls, elevators, telecommunications, and medical equipment.

In the first part of the switching cycle, the input voltage applied to a capacitor (C1). In the second part of the switching cycle, the charge transfer from C1 to the second capacitor C2. The most traditional switched capacitor converter is constructed with an anti-converter, which has a ground positive terminal C2, its negative side delivery negative output voltage. After a few cycles, the voltage across C2 will be applied to the input voltage. Assuming there is no load on the C2, there is no loss of the switch and no continuous resistor in a capacitor, the output voltage will coincide with the negative of the input voltage. In reality, the efficiency (and the resulting accuracy of the output voltage) depends on the switching frequency of the charge transfer resistance, the value of resistance of the capacitor and continuous switch. A similar voltage doubler topology using the same switches and capacitors, but changed the ground connection and input voltage. Other more complex variant products using additional switches and capacitors for input voltage and output voltage of other transition rate, and in some cases, to generate fractional relationship (e.g., 3/2) the use of specialized switching sequence. In various simplest form electric transformer‍, a switched-capacitor converter is not provided with the function of the regulator. Some new Power Transformer‍ National Semiconductor switched capacitor converters with automatic adjustment of gain levels to produce a regulated output; other switched-capacitor converters use a built-in low-dropout linear regulator to create unregulated output.

Circuit breaker Error flag

Error flag is an open collector output, when the regulated output voltage is lower than 5% of the rated output voltage (typical), it will send a signal. Initially, the error flag is low until the output voltage Voltage stabilizer‍ reaches 95% of the rated output voltage is reached. In some cases, an error flag appears in the power converter there is a delay. This delay is set by an external capacitor, and can be used as power-reset function to reset the microprocessor to power up. If the display state "error", the output voltage is lower case such that the open collector output is high (Circuit breaker ). When the output voltage is within 5% of rated voltage up and down, this flag output is low.

Switch

"On / Off" or "stop" feature allows the regulator to be able to open or close the case charged. While in "off" or "stop" mode, the regulator supply current because the output is disabled and fell to a lower level, but the internal bias circuitry is still running. By re-enabled when the regulator will shut down than the input Air circuit breaker‍ voltage and opened the case again much faster output voltage regulation. If the display in the "on" state, the logic high voltage regulator is started. Otherwise, a logic low will be started.

Cncelegroup Adjustment

In switching regulators and switched capacitor converters using an internal oscillator to set the switching frequency of the output transistor. The value of the switching air circuit breaker‍ frequency can be determined in some external components used in the converter, to determine the frequency of the noise generated by the converter, and the impact performance of the converter. Some converter allows to adjust the internal oscillator frequency ("frequency adjustment") or by synchronizing oscillator with an external power supply ("sync") to change the switching frequency. Generally, by increasing the switching frequency, with smaller parts (capacitors, inductors) in the converter output stage. This may reduce the efficiency of the converter, because of the increased switching losses, unless while using higher quality components. Good performance higher frequency than the lower frequency converter converter has a faster transient response. Electric transformer‍ If a board has several converters, it is often best to sync them to a common source. It can control the noise generated by the entire batch, and to minimize any "tapping frequency" may arise. This problem is usually very important for high-power converter (e.g. power 5W or higher). In many cases, the switching frequency can increase from its preset value. Product data sheets will mark the frequency range of the function.

Capacity curve

Auto regulator (single-phase 0.5kVA ~ 3kVA, 10k and below the horizontal, three-phase 9kVA and below) when the input voltage drops below 198V, output capacity began to decline; when the input voltage is equal to 160V, down to 50% of the rated capacity of the regulator. Therefore, the lower end of the supply voltage with particular Voltage stabilizer‍ attention to lighten the load derating, so as not to overload the regulator burned;