In the realm of industrial machinery, inverters play a crucial role in converting direct current (DC) to alternating current (AC), enabling the efficient operation of various electrical devices. However, like any complex electronic system, they are susceptible to faults, especially after encountering events such as lightning strikes. This article delves into the diagnostic process and subsequent repair of a TECO…
Month: December 2023
Troubleshooting and Repairing a Switch Power Supply Malfunction in the Jialing VSD JP6C-9 Model
When dealing with complex electronic devices like the Jialing VSD JP6C-9, encountering issues such as a malfunctioning switch power supply can be both frustrating and challenging. This article details a step-by-step diagnostic and repair process for a specific case where the operation panel failed to display any information upon powering on, despite the input and output terminals of the main…
Maintenance of Switch Power Supply Fault in Taian N2-1013 VSD
Upon powering on, there was an OC fault. It was detected that the inverter output module was not damaged, and most of the six inverter drive ICs were damaged. Further inspection revealed a peculiar phenomenon in the switch mode power supply: when the CPU motherboard was disconnected for power supply,+5V was measured to be normal, but the power supply of…
Troubleshooting Guide for CVF-G1 Switching Power Supplies in CONVO Frequency Converters
Title: Troubleshooting Guide for CVF-G1 Switching Power Supplies in CONVO Frequency Converters Introduction:We recently received three CVF-G1 frequency converters from Kangwo, all exhibiting identical issues: no output from the switching power supply and no screen display. Given that the power supply IC in these machines is a 3844B, and considering the rarity of this IC causing failures in multiple units simultaneously,…
Repair Guide for INVT G9 Series Frequency Converter “Crash” Fault
Repair Guide for INVT G9 Series Frequency Converter “Crash” Fault When dealing with a reported “crash” fault in an INVT G9 series frequency converter, a systematic approach to diagnosis and repair is crucial. This article outlines a step-by-step process based on user feedback, detailed inspection, and successful repair. User Feedback and Initial Observations The user reported that the frequency converter…
Handling Method for SC Jumping Fault of GS Series INVT VSD
SC: Refers to a short circuit in the output load of the frequency converter. In the state of power outage, there is no short circuit between U, V, W and between U, V, W and DC P, N. To distinguish whether it is a current detection circuit fault on the CPU motherboard or a signal returned by the driving IC,…
Special situation of Alpha VFD tripping OC fault
Generally speaking, there are two sources of OC faults: When the operating current of the inverter module is too high, reaching more than three times the rated current, and the voltage drop of the IGBT tube rises to more than 7V, the driving IC returns an overload OC signal to notify the CPU and implement fast shutdown protection; After collecting…
A Hidden Cause of Alpha Inverter OC Fault Tripping and Shutdown
During the maintenance of the Alpha low-power inverter, it was discovered that the inverter has a common problem – it is prone to OC failure. It manifests as: often jumping faults during start and stop operations, but sometimes also jumping faults during operation; Sometimes it inexplicably improves and can run for varying lengths of time. When I thought there was…
Repairing Two Delta VFD-A Frequency Converters: A Detailed Guide
In the realm of industrial equipment maintenance, frequency converters play a crucial role in controlling motor speed and efficiency. Recently, I encountered two Delta VFD-A frequency converters that required extensive repairs due to severe damage in their output modules and driving circuits. This article documents the step-by-step process of diagnosing, repairing, and testing these converters, highlighting key lessons learned. Initial…
n-depth Analysis and Maintenance Guide for Mitsubishi F1S Switching Power Supply
In-depth Analysis and Maintenance Guide for Mitsubishi F1S Switching Power Supply In the field of modern industrial automation, the application of Mitsubishi PLCs (Programmable Logic Controllers) is extensive. As a critical component of PLCs, the stability and reliability of the switching power supply directly determine the operating efficiency of the entire system. This article takes the Mitsubishi F1S switching power…