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Sothermal Shock Tester Refrigeration System Power Protection Circuit


sothermal Shock Tester. The following diagram in the circuit T for the transformer, DBI for the full bridge.
Which RP1, LM324 8,9,10 feet and peripheral components constitute the undervoltage protection circuit.
The resistors R5 ~ R8 provide the reference voltage for the comparator. R1 ~ R4, R13 and R14 are the voltage divider resistors. VDl and VD2 are the coupling diodes. The resistors R5 ~ R8 provide the reference voltage for the comparator 12,13,14 and the peripheral components of RP2 and LM324. The
☆ sothermal Shock Tester power supply voltage is normal, RP1 output voltage makes LM324 9 feet potential greater than 10 feet, the 8-pin output low, single-chip to determine the power supply voltage is normal.
☆ When the sothermal Shock Tester power supply voltage is lower than 190V, RPl output voltage makes LM324 9 feet less than 10 feet potential, the 8 feet output high, the VD1, R13, R14 partial pressure into the microcontroller for undervoltage control The
☆ power supply voltage is normal, RP2 output voltage to make LM324 12 feet more than 13 feet potential, the 14-pin output low, single-chip to determine the power supply voltage is normal.
☆ When the sothermal Shock Tester power supply voltage is higher than 245V, RP2 output voltage makes LM324 12 feet less than 13 feet potential, the 14-pin output high, the VD2, R13, R14 partial pressure into the microcontroller over-voltage control The
☆ sothermal Shock Tester Power Over Voltage Undervoltage Protection Circuit Common Fault: Power supply voltage is normal but undervoltage indication or protection, power supply resistance is too high or too low, but not undervoltage protection.
 Power over voltage undervoltage circuit
sothermal Shock Tester refrigeration system three - phase power supply phase protection circuit principle. In the three-phase cabinet sothermal Shock Tester, sothermal Shock Tester refrigeration system compressor coil damage is caused by the lack of 70%, so sothermal Shock Tester refrigeration system compressor phase failure protection circuit is widely used in three-phase cabinet In the model sothermal Shock Tester, the following figure shows the current mutual inductance phase loss protection circuit.
 Current mutual inductance phase failure protection circuit
◇ The circuit consists of two identical current transformers, this circuit will sothermal Shock Tester refrigeration system compressor current through the current transformer into AC voltage, and the diode rectifier for the DC voltage input microcontroller to determine the final control sothermal Shock Tester refrigeration system compressor contactor pull and release.
◇ When the sothermal Shock Tester refrigeration system compressor phase loss operation, will cause no phase of the two-phase current has greatly increased, then the current transformer secondary output AC voltage correspondingly increased by the diode VD rectifier, capacitor C filter The output of the DC voltage is also increased, the voltage through the microcontroller after the internal control, control sothermal Shock Tester refrigeration system compressor contactor coil power.
◇ sothermal Shock Tester Refrigeration System Compressor operating current is too small In contrast to the above control results when the sothermal Shock Tester refrigeration system compressor operating current greater than the rated current of 1.4 times or less than the rated current of 0.3 times, the microcontroller will determine the power shortage Phase, circuit as shown in the figure, where R1 is the load resistance, R2 is the current limiting resistor, R3, R4 is the voltage divider, VD is the rectifier diode, C is the filter capacitor, L is the current transformer,
◇ phase sequence protection circuit, three-phase cabinet type sothermal Shock Tester commonly used scroll sothermal Shock Tester refrigeration system compressor, because the scroll type sothermal Shock Tester refrigeration system compressor is not allowed to reverse, so the increase phase sequence protection circuit.
◇ C1-C5 for the phase shift capacitor, R1, R2 itself is a resistance, because there is no standard value of 72KΩ, so the use of two resistors in series.
◇ R, S, T for the three-phase AC power, A, B, C for the phase sequence relay normally closed and normally open contacts, according to the circuit design, can be used to control the normally open contact or normally closed contact protection sothermal Shock Tester.
 When the three-phase power supply phase sequence is correct, R3 and C5 in series, the two ends will produce 220V voltage, the voltage phase sequence relay pull, thus connected to the single-chip control circuit or sothermal Shock Tester refrigeration system compressor contactor coil circuit The
◇ When the three-phase power supply phase sequence error, R3 and C5 voltage is only about 30V, so phase sequence relay will not pull, so sothermal Shock Tester refrigeration system compressor will not start running.