This article only discusses the inverter module made of a single or double IGBT tube, as well as the methods for measuring and judging its quality. The IPM module is not within the scope of this article’s discussion.Field effect transistors have the advantages of fast switching speed and voltage control, but they also have the disadvantages of large conduction voltage…
Year: 2023
Maintenance and Fault Shielding Tips for Senlan Inverter SB40-S11-11KW Drive Circuit
Maintenance and Fault Shielding Tips for Senlan Inverter SB40-S11-11KW Drive Circuit When dealing with the repair of a Senlan SB40-S11-11KW frequency converter, it’s crucial to approach the process methodically to identify and resolve issues effectively. This article provides detailed insights and step-by-step guidance on troubleshooting and maintaining the drive circuit of this specific inverter model. Initial Diagnosis Upon inspecting a…
Analysis of PLC-Based Variable Frequency Constant Pressure Water Supply System with One-to-Two Drive
Introduction Variable frequency constant pressure water supply systems are essential for maintaining stable water pressure in pipeline networks. This article delves into a specific system configuration that employs a Programmable Logic Controller (PLC) and a frequency converter to control two water pumps in a one-to-two drive setup. The system ensures continuous and stable water supply by automatically adjusting the pump…
Repairing the Stubborn GF Fault in Yaskawa 616G3 55kW Frequency Converter
Repairing a frequency converter, especially one that reports a stubborn ground fault (GF), can be a challenging and frustrating task. Recently, I encountered such an issue with a Yaskawa 616G3 55kW frequency converter. Despite the common advice to replace the board, I delved deeper into the problem, determined to find a logical solution. This article outlines the step-by-step process I…
Omron PLC Switch Power Supply: Understanding and Maintenance Guide
Omron, a leading Japanese brand in the field of Programmable Logic Controllers (PLCs), holds a significant market share in mainland China. Given its widespread application in industrial control systems, understanding the maintenance of Omron PLCs, particularly their switching power supplies, is crucial for ensuring operational efficiency and minimizing downtime. This article delves into the maintenance process of Omron PLC switch…
Mitsubishi VSD F700-A700 Power Driver Board Circuit Diagram and MCU and Optocoupler Specification Confirmation
There is a separate MCU and six communication optocouplers OI1~OI6 on the power drive board of Mitsubishi F700 (F740, F720) and A700 (A740, A720) frequency converters. Their specifications look a bit mysterious and may cause confusion during maintenance. The relevant circuit diagram will be drawn below, and a simple functional analysis of the MCU and optocoupler will be conducted to…
How to handle the password lock of VFD-E Delta VFD converter?
I helped a friend debug a Delta VFD-E frequency converter on site, but due to a damaged panel, I couldn’t operate it after purchasing a panel provided by a friend. This friend went to the site and adjusted it all morning, but the frequency converter still couldn’t run. When I arrived at the site, I found that the parameters couldn’t…
Simplified Debugging Guide for Siemens 400 Series (420/430/440) VFD Drives
Simplified Debugging Guide for Siemens 400 Series (420/430/440) VFD Drives Debugging a Siemens 400 series Variable Frequency Drive (VFD), specifically models 420, 430, and 440, can initially seem daunting due to the multitude of parameters and unfamiliar symbols on the operation panel. However, with a structured approach, even newcomers can quickly master the basics and get these drives running efficiently.…
Different scenarios of “GF” ground fault are reflected in the maintenance of Yaskawa 616G3 VSD drive
The power on display is normal. Start the operation, that is, jump “GF” fault, but it does not run or shows no signs of running. I quickly jumped over the ground fault. The “GF” fault at this time is equivalent to the “OC” fault of other frequency converters, and the fault is located in the inverter module or driving circuit.…
Key Considerations for Selecting and Using Variable Frequency Drives (VFDs)
Variable Frequency Drives (VFDs), also known as frequency converters, are essential devices in modern industrial and commercial applications, providing precise control over motor speed and torque. However, their effective utilization requires a thorough understanding of their operational nuances and precautions. This article delves into the critical aspects of selecting and using VFDs to ensure optimal performance and longevity. Operational Modes…