1. Capacity safety factor
The AC regulated power supply is based on the output apparent power (kVA) as the nominal rated capacity, and the load is not purely resistive under normal circumstances, that is, the power factor COS¢≠1, and the active power that the regulator can output in practice kW = capacity (kVA) × COS¢. Therefore, in the practice of selection, it is necessary to reasonably select the regulated power supply according to the specific conditions such as the rated power, power factor and load type of the electrical equipment, and the output power should leave an appropriate margin, especially when the impact load is selected, the margin should be larger, and the specific selection safety factor is shown in the following table
Load Nature Device Type Safety Factor Select the regulated power supply capacity
Pure resistive load incandescent lamp, resistance wire, electric furnace and other equipment 1.25 - 1.5 1.25 - 1.5 times the total load power
Rational and capacitive load Fluorescent lamps, fans, motors, pumps, air conditioners, computers, refrigerators, etc. 2 - 3 ≥ 2 - 3 times the total load power
In the environment of large electrorational and capacitive loads (such as motors and computers), the starting current of the load should be considered to be particularly large (up to 5-8 times of the rated current), so the voltage regulator capacity should be 2.5-3 times of the load power when selecting the voltage regulator.
For example, when the three-phase motor is 2.2kW and 5.5kW, when the voltage regulator is selected, the capacity is ≥ (2.2kW+5.5kW) ×2.5=19.25 kVA, that is, at least the voltage regulator of the three-phase SJW-20 kVA or above products should be selected.
2. The output capacity curve of the uncompensated regulated power supply
Auto-coupling voltage regulator (single-phase 0.5kVA - 3kVA, 10k horizontal and below, three-phase 9kVA and below) When the input phase voltage is lower than 198V, the output capacity begins to decrease; When the input phase voltage is equal to 160V, it drops to 50% of the rated capacity of the regulator. Therefore, at the low end of the power supply voltage, special attention should be paid to reducing the load derating, so as not to overload the regulator and burn it;
The auto-coupling regulator is capable of outputting both 220V and 110V voltages simultaneously. However, even when the output is fully 110V, the load on the regulator should not exceed 50% of the rated capacity, otherwise it will be overloaded.
According to most of the current computers 350W,. It is recommended that you choose a voltage regulator above 8000W.
Pay attention! The computer should use a servo regulator or other non-intermittent power supply regulator.
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Precautions for the use of Delta inverters
1. The inverter must be selected correctly.
2. Read the product manual carefully, and wiring, device and application in accordance with the requirements of the manual.
3. The inverter device should be firmly grounded to suppress radio frequency disturbance and avoid electric shock caused by leakage of the inverter.
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Introduction to the internal components of the inverter - Delta inverter
Rectifier circuits
It consists of six rectifier diodes from VD1 to VD6 to form an uncontrollable full-wave rectifier bridge. Regarding the rated power supply of 380V, the reverse withstand voltage value of the diode should be 1200V, and the forward current of the diode is 1.414-2 times of the rated current of the motor.
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The output of the inverter is not short-connected to the power frequency
1. To switch the motor of the power frequency, the parking method is set to free parking, and it is important not to park softly
2. Intercept the contactor of the motor from the output end of the inverter, and the control stop button and the inverter parking button are the same composite button, that is, when the inverter is pressed, the inverter parking will be followed by the contactor line.
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Inverter wiring and parameter setting method - Delta
The inverter used in industry is divided into two types: single-phase and three-phase, which is distinguished from the voltage supplied by the main circuit, which is the main circuit to be connected to RST three-phase 380 volt alternating current, and the output is connected to the UVW three-phase line to the motor; And the single-phase is the main circuit connected to the single-phase 220 volt LN alternating current, the output is the same ...
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Delta's inverter external positive and reverse operation mode
1. The external control panel is rotated and operated
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The inverter has a function – a Delta inverter
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The hard start of the motor will cause a serious impact on the power grid, and it will also require too high the capacity of the power grid, and the large current generated when the motor is started and the sensation will cause great damage to the baffle and valve, and the service life of the equipment and pipeline will be extremely unlucky. And the use of inverter energy-saving devices ...
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The inverter has a built-in PLC function - Delta
PLC progressive scanning standard work preparation.
Abundant programming language: instruction statements; ladder diagram; SFC。
Abundant instruction statements: 45 instruction varieties, including 28 root instructions and 17 usage instructions.
350 step law capacity.
uS-level root directives ...
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Solution to the problem of inverter undervoltage - Delta
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Delta's inverter failure analysis
1. Fault code:
SE1 parameter replication error
Fault Description:
Keypad replication function error correct
Solution:
Keypad replication action errors, including communication delays, communication errors (Keypad received FF86 errors), and parameter value errors
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