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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.
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.
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.
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.
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.
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.
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.
A frequency converter consists of four main parts: rectifier, DC link (intermediate DC circuit), inverter, and control circuit. The rectifier converts the mains AC into DC; the DC link filters and stores energy; the inverter, under the command of the control circuit, converts the DC back into AC with adjustable frequency and voltage for the motor.
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.
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).
