HeKang power unitDebugging is a key link to ensure its stable operation and accurate output. It is necessary to follow the principle of "basic inspection first, step-by-step debugging, and linkage verification later". The following are 7 core debugging points for easy and quick mastery:

Basic checks before debugging

Electrical connection inspection: Confirm that the input and output cables and control signal lines of the power unit are firmly connected without looseness or virtual connections; Check whether the positive and negative poles/phase sequence of the power cord are correct to avoid equipment burning out due to wiring errors.

Insulation performance test: Use a megohmmeter to test the insulation resistance between the unit casing and internal circuit, with a requirement of ≥ 2M Ω. At the same time, check whether the cooling fan, cabinet protection and other components are intact and free of foreign objects blocking.

Parameter pre check: Confirm that the rated voltage, current, power and other parameters of the unit match the system design requirements, and enter the basic operating parameters in advance (such as overcurrent protection threshold, start-up delay, etc.).

Pre commissioning of no-load before power on

Disconnect the power unit from the load first, power on only the control circuit, check if the control panel indicator lights and display screens of the unit are lit up normally, and whether the communication module can establish a connection with the upper computer.

Test the local/remote control switching function of the testing unit, verify the effectiveness of safety devices such as emergency stop button and fault reset button, and ensure the normal control logic.

Low voltage power on and module self-test

Using a voltage regulator to input low voltage (such as 30% of the rated voltage) to the power unit, start the unit and observe the working status of internal IGBT modules, rectifier bridges, and other core components, without abnormal heating or noise.

Trigger the self check program of the unit to check whether the overvoltage, overcurrent, overheating and other protection functions can be accurately triggered, whether the protection threshold is consistent with the set value, and to avoid protection failure or misoperation.

Step by step debugging with load

Light load debugging: Connect 20% -30% of the rated load, gradually increase the input voltage to the rated value, monitor whether the output voltage and current waveforms of the unit are stable, and whether there are problems such as harmonic exceedance and voltage distortion.

Rated load debugging: Switch to the rated load condition, run continuously for 1-2 hours, record key data such as unit operating temperature, power factor, output efficiency, etc., to ensure that all indicators meet technical requirements.

Overload test: Conduct short-term overload debugging according to specifications (such as running at 110% rated load for 10 minutes), verify the overload capacity and protection response speed of the unit, and check whether the components are damaged after overload.

Communication and linkage debugging

If the power unit is connected to a multi unit parallel or complete system, it is necessary to debug the current sharing and synchronization control functions between the units to ensure that the output power of each unit is balanced and there are no circulating current abnormalities.

Verify the communication stability between the verification unit and the upper computer and PLC, test the functions of parameter reading, instruction issuance, fault reporting, etc., to ensure that there is no delay or packet loss in data transmission.

Fault simulation debugging

Artificially simulate common faults (such as input voltage fluctuations, load short circuits, cooling fan faults, etc.), observe whether the fault alarm and protection actions of the unit are timely and accurate, and test the recovery ability after fault reset.

Record the triggering conditions and disposal results of various faults, form a fault investigation ledger, and provide reference for later operation and maintenance.

Data retention and acceptance after debugging

Organize all data during the debugging process (such as voltage and current curves, protection thresholds, operating efficiency, etc.), form a complete debugging report, and keep a comparison record between the factory parameters of the equipment and the actual debugging parameters.

Acceptance testing shall be conducted in accordance with industry standards to confirm that the unit meets all performance standards before it can be put into formal operation.