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TECO VFD Fault Code List & Troubleshooting (OC/OU/LU/OH/OL/GF)
Customers running TECO VFDs (TECO VFD series such as JNI, K, etc.) most often ask one thing: "what does the code on the screen mean?" We ranked the high-frequency alarms by how often they show up, and paired each with on-site troubleshooting steps you can follow directly. Bookmark this page—next time a fault pops up, don't rush to call service; you can clear more than half of them yourself.
2026/10/14 TECO-ELEC
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TECO VFD ND vs HD: What's the Difference & How to Choose
When reading the TECO VFD selection manual, many people get stuck on the two letters ND / HD—same power, yet the ND-rated and HD-rated models differ in both price and load capacity. The TECO VFD ND and HD difference is essentially the "overload rating." Choose wrong and you either get frequent OL trips or overspend. This article explains it in one read.
2026/10/14 TECO-ELEC
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Relationship Between TECO Inverter V/f Curve Settings and Low-Speed Overcurrent
TECO inverters provide multiple V/f curve selections. The default F0 or F1 is suitable for most general-purpose loads. When the load characteristics deviate from the default curve—for example, a constant-torque load that requires higher torque at low speed—it is necessary to switch to the corresponding curve or manually adjust the torque boost parameter.
2026/09/18 TECO-ELEC
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How to Adjust the Acceleration Time Parameters on a TECO Inverter
For TECO inverters, the acceleration time parameter codes are Bn-01 (Acceleration Time 1) and Bn-03 (Acceleration Time 2); the corresponding deceleration times are Bn-02 and Bn-04. Some series also use 00-09 as Acceleration Time 1. The setting range is 0.1–3600.0 s, and the factory default is usually 10.0 s.
2026/09/18 TECO-ELEC
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Troubleshooting High‑Voltage Motor Cooling System Failures
Complete guide to troubleshooting high-voltage motor cooling system failures. Covers temperature anomalies, water/air cooling checks, leak & blockage fixes, and daily maintenance to prevent overheating.
2026/09/04 TECO-ELEC
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What permanent magnet materials are commonly used in permanent magnet motors?
The most commonly used material in permanent magnet motors today is Neodymium Iron Boron (NdFeB). It has a very high energy product, which allows for strong magnetic fields, making motors smaller and more powerful. Ferrite permanent magnets are cheaper, but their magnetic performance is lower, so they are often used in low‑power or cost‑sensitive applications.
2026/08/15 TECO-ELEC
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Why are permanent magnet motors more energy-efficient than traditional motors?
Traditional induction motors need to draw current from the power grid to generate a magnetic field. This current is called "excitation current" and it consumes electrical energy without doing useful work. In contrast, a permanent magnet motor has its own built-in permanent magnets on the rotor, so the magnetic field is provided by the magnets and no excitation current is required.
2026/08/14 TECO-ELEC
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On the Matching Relationship Between Frequency Converters and Motors
Driving motors with frequency converters has become an irreversible trend. In practice, however, improper matching between the converter and the motor often leads to various issues.
2026/07/17 TECO-ELEC
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Composition and Working Principle of a Frequency Converter
A frequency converter (also called a variable frequency drive, VFD) is a power control device that converts a fixed‑frequency AC supply into an AC output with adjustable frequency and voltage. Most converters in use today adopt the AC‑DC‑AC conversion method (VVVF or vector control).
2026/07/16 TECO-ELEC
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High-Voltage Motor Current Calculation
In industrial power distribution and equipment selection, calculating the rated current of a high‑voltage motor is a fundamental yet crucial task. Many engineers new to high‑voltage systems may think it is complicated, but in fact its core principle is the same as that for low‑voltage motors – it all comes down to power, voltage, and power factor.
2026/07/10 TECO-ELEC
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CE, ATEX, IECEx – Not the Same Thing! So What Are They?
In short, CE marking is the “passport” for products to enter the EU market; ATEX is one of the specific regulations that explosive‑atmosphere equipment must satisfy to obtain that CE marking; and IECEx is an “international passport” designed for global mutual recognition.
2026/06/30 TECO-ELEC
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Common faults and countermeasures of reducers
Since a reducer is a transmission device, many faults often occur during its operation due to external working conditions (e.g., bearing heavy loads) and internal factors.
2026/06/12 TECO-ELEC
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Relationship between Motor Torque and Motor Volume
It can be stated boldly – and accurately – that the overall volume of a motor is determined by the torque it must produce: the larger the volume, the greater the torque. Of course, there may be exceptions to this rule, but as a general guideline for motor selection, it is very useful.
2026/06/11 TECO-ELEC
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What conditions need to be met for exporting motors to Taiwan?
Low-voltage motors are subject to mandatory BSMI inspection and control, while high-voltage motors are not subject to this restriction. Currently, high-voltage motors have no mandatory energy efficiency regulations and do not require registration in any official system; they only need to comply with relevant specifications for high-voltage electrical equipment.
2026/05/26 TECO-ELEC
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What is the Korean KC certification?
KC Certification (Korea Certification) is a mandatory certification implemented by the Korean government to ensure the safety of electronic products and consumer goods. The Korean market has strict requirements for product safety and quality, and obtaining KC Certification is crucial for products to enter the Korean market.
2026/05/11 TECO-ELEC
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Overview of Mexico's NOM and FIDE Certifications
For Chinese companies planning to export products to Mexico, understanding the local compliance certification system is the first critical step to successfully entering the market. Among the various certifications in Mexico, NOM and FIDE are the two most relevant for electronic and electrical products. The former is a mandatory market access standard, while the latter is a voluntary energy efficiency label. This article provides a systematic overview of the key aspects of both certifications, offering practical compliance guidance for exporters.
2026/04/23 TECO-ELEC
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What is the difference between the routine test and the type test for high-voltage three-phase asynchronous motors?
The core difference between the routine test (factory test) and the type test for high-voltage three-phase asynchronous motors is:
The routine test is a "factory pass certificate" performed on every motor to verify the manufacturing quality of each unit. The type test is a "design validation report" performed on a sample from the same specification to verify the design and performance compliance of the entire series.2026/04/16 TECO-ELEC
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Insulation Class of High-Voltage Three-Phase Asynchronous Motors
The insulation class of high-voltage three-phase asynchronous motors is a core technical indicator defined based on the maximum allowable operating temperature of the insulation materials.
2026/04/10 TECO-ELEC
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Factors Affecting the Efficiency of High-Voltage Motors
There are many factors that affect the efficiency of high-voltage motors, including motor body losses, operating conditions, design and structural factors, as well as installation, maintenance, and environment. A detailed analysis is provided below.
2026/03/27 TECO-ELEC
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Five core performance parameters of electric motors
The five core performance parameters of a motor are key indicators for evaluating its performance, suitability for application scenarios, and selection criteria. They directly determine the operating state and effectiveness of the motor, including rated power, rated voltage, rated current, rated speed, and rated frequency.
2026/02/11 TECO-ELEC