How To Adjust The Overvoltage Protection Of The Voltage Regulator

The overvoltage light of Dynamic Voltage Regulator (DVR) is on because the input voltage is too high and exceeds the input range of the voltage regulator, causing the overvoltage light of the voltage regulator to light up. You can use a multimeter to measure the output voltage of the voltage regulator between 250 volts and 245 volts when the red light is on, proving that the voltage regulator has an overvoltage alarm and no protection function. How to adjust the overvoltage protection of the voltage regulator? Generally, there is a main control circuit board in the voltage regulator. There is an overvoltage adjustable resistor on the circuit board. The specific one needs to be determined and found. The overvoltage protection of the voltage regulator will cause the overvoltage light of the voltage regulator main control board to light up. At this time, try to adjust an adjustable resistor close to the voltage regulator overvoltage light. Try clockwise. If it doesn't work, adjust it back to the position counterclockwise and adjust it a little more until the light goes out. At this point, the overvoltage protection adjustment of the voltage regulator is completed.

Working principle of voltage stabilizer: Since some electrical appliances contain coil components, eddy currents that hinder current will be generated at the beginning of power-on. The generation of eddy currents will not only weaken the instantaneous voltage when the appliance starts, resulting in slow startup, but also strengthen the instantaneous voltage generated after the circuit is broken, which may cause sparks and damage the circuit. At this time, a voltage stabilizer is needed to protect the normal operation of the circuit. The voltage stabilizer consists of a voltage regulating circuit, a control circuit, and a servo motor. When the input voltage or load changes, the control circuit samples, compares, and amplifies, and then drives the servo motor to rotate, so that the position of the voltage regulator carbon brush changes, and the output voltage is stabilized by automatically adjusting the coil turns ratio. Larger capacity voltage stabilizers also work on the principle of voltage compensation.

The voltage stabilizer consists of the following parts: adjustment circuit, sampling circuit, sampling amplifier, and reference circuit. In the voltage stabilization process, it is assumed that the output voltage has reached the preset voltage. When the output voltage changes, the sampling circuit obtains the sample, samples it amplifies and compares it with the reference circuit to determine whether the output voltage changes to a higher or lower level, and determines the amount of change, thereby controlling the adjustment circuit to work and prompting the adjustment circuit to adjust the output voltage to a lower or higher level until the output reaches the preset voltage.

Special reminder: If the voltage regulator trips due to overvoltage protection, it does not necessarily mean that the machine has a quality problem, nor is it the only reason. It is also possible that the grid line voltage is indeed very high, or the overvoltage protection value is improperly set. Regardless of the reason, please do not panic and call the after-sales technicians in time to provide you with professional technical services.