After checking the drive circuit of the 22kW Delta VFD Drive and replacing it with a new module, the OC will jump upon startup. The module is newly replaced, and all six drive pulses are working properly. I don’t think it should be. Still checking the measurement, the six negative pressures driving the IC during shutdown are all normal, and…
Month: December 2023
Repairing a 22kW HC1 Drive Module Malfunction: A Detailed Guide
When dealing with the repair of a 22kW HC1 drive, it’s crucial to approach the process methodically, especially when encountering complex issues such as a blown fuse in the inverter module power supply series connection. This particular case study illustrates the step-by-step diagnosis and resolution of such a problem, highlighting the importance of thorough inspection and precise troubleshooting. Initial Diagnosis…
Repair of EDS1000 ENC VFDV Misleading Current Fault
A ENC EDS1000 11kW Inverter will trip to constant speed overcurrent when accelerating to above 40Hz during operation. But in reality, the operating current is much lower than the rated current, and after switching to other frequency converters, the motor runs normally. Check that the six inverter pulse outputs of the driving circuit are all normal. It is determined that…
Hitachi VFD drive L300P75kW , after repair, installation still jumps “fault”，How to solve ？
A Hitachi L300P75kW Inverter was installed and tested on site after repairing the module fault. When powered on and started, E16.4 or E16.2 jumps. The cause of the fault is a momentary open circuit in the power supply. Stop the machine and measure the three-phase 380V power input. All three phases have 380V and are quite balanced. During operation, when…
15kW WEICHI VSD fault repair due to lightning strike
Taking over a 15kW WEICHI frequency inverter, it was damaged by lightning strikes. The motherboard and driver board were both struck by lightning, but fortunately, the module and CPU were not damaged. Inspection: Control terminal+10V voltage to 0, no output. This voltage is obtained by stabilizing the+15V of the switching power supply through the LM317 (eight pin SMT IC) circuit.…
Troubleshooting and Repairing the Shanghai Rihong CHRH-415AEE 1.5kW Variable Speed Drive (VSD)
Repairing electronic equipment, especially complex devices like variable speed drives (VSDs), often requires a meticulous approach to diagnosing and solving issues. A recent repair case involving the Shanghai Rihong CHRH-415AEE 1.5kW VSD highlights the importance of thorough inspection and the unexpected twists that can arise during the troubleshooting process. The user of the CHRH-415AEE VSD reported experiencing unstable output and…
Exploring the Major Causes of Damage to Inverter Output Modules
Exploring the Major Causes of Damage to Inverter Output Modules In variable speed drive (VSD) systems, damage to the inverter output module is an issue that cannot be ignored. This article delves into several primary reasons behind this failure, analyzing the underlying logic and mechanisms to provide valuable insights for relevant practitioners. I. Damage Caused by Abnormal Loads Despite the…
Siemens MM430 VSD 7.5kW power supply hiccup fault
Repair an imported Siemens 7.5kW frequency converter due to power supply hiccup fault, with no display on the operation panel. Due to its special installation structure, the machine is surrounded by three circuit boards and a heat dissipation plate in a square shape, with an embedded shell. When repairing, it is necessary to disconnect the circuit board and lay the…
Troubleshooting a Convo Frequency Converter: A Case Study
When dealing with complex electronic devices like frequency converters, troubleshooting can often be a challenging task. This article presents a detailed case study of a 5.5kW Convo frequency converter that was sent for repair due to issues with its operation. Despite having output, the converter was unable to operate with a load, the motor couldn’t rotate, and the operating frequency…
Solving Two Unusual Faults in AMB VSD: A Detailed Guide
When dealing with variable speed drives (VSDs), encountering unusual faults can be both perplexing and time-consuming. This article will delve into two unique faults encountered in an Anbang Xin AMB-G9/P9 22kW frequency converter and provide step-by-step solutions to resolve them. Fault A: Mysterious “Fault Characters” A user sent in a domestically produced frequency converter for repair, specifically an Anbang Xin…