Phenomenon 1: Output with voltage but no current, or possibly with current but no voltage. In either case, the power supply is functioning normally. Operators should check if their loads are properly grounded, if there's a short circuit or an open circuit, and if the loads meet the standards, etc. In extreme situations, if the power supply outputs voltage (constant voltage condition) but the load wire is broken, the output current naturally equals zero. Similarly, if the power supply outputs current (constant current condition) but the load is short-circuited, the output voltage naturally equals zero.
Phenomenon 2: During voltage adjustment, it was found that the no-load voltage could not be increased. Some operators prefer to turn the "current adjustment" potentiometer all the way to the left, which prevents the power supply from adjusting the no-load voltage. This indicates a lack of substantial understanding of "current adjustment." Since the power supply still consumes a small amount of current even when it is unloaded, turning the "current adjustment" to zero prevents even a tiny current from flowing, thus the no-load voltage cannot be increased. Therefore, the "current adjustment" should generally not be turned to zero (turning it about a quarter of the way to the right will prevent the above situation). Standard operating procedure: When setting the voltage output of a voltage regulator, turn the current adjustment knob clockwise to the bottom and maintain it. The voltage adjustment knob controls the output DC voltage value. When setting the current output of a current regulator, turn the voltage adjustment knob clockwise to the bottom and maintain it. The current adjustment knob controls the output DC current value. 36V aviation power supply, 400HZ frequency conversion power supply, 115/200V power supply, 27V DC power supply, 400HZ power supply, aviation power supply
Issue 3: The power supply outputs both voltage and current, but when trying to adjust the voltage, it cannot be increased anymore. Similarly, if the power supply outputs both voltage and current and you attempt to increase the current further, it cannot be amplified. This is due to the operator's lack of understanding of the "constant voltage" and "constant current" concepts. If the "constant voltage" indicator is lit, it indicates that the power supply is operating in constant voltage mode (which can be considered as voltage taking an automatic position), at which point the output current level is determined by the load, not by the operator's adjustment (the current can be said to take a passive position). If you then turn the "current adjustment" knob clockwise, the current will not increase. However, if you turn the "voltage adjustment" knob clockwise at this point, the output voltage will rise, and the output current will also increase accordingly (voltage is the primary, and current is secondary). Similarly, if the "constant current" indicator is lit, it indicates that the power supply is operating in constant current mode. In this case, the output voltage is not "adjusted" but determined by the load. Only by adjusting the "current adjustment" knob will the output current change, and the output voltage will also change accordingly (here, current is primary, and voltage is secondary). In summary, it is important to clarify the primary and secondary relationships. To change the voltage and current on the load, one must adjust the current when the power supply is in constant current mode and adjust the voltage when it is in constant voltage mode.
