IDEC VF1A Doesa VFDs are designed to be suitable for speed control of variable and constant torque applications ranging from fans and pumps to specialized equipment. The VFD is capable of driving an induction motor (IM) or a permanent magnet synchronous motor (PMSM). IMs can be driven in open loop or closed loop, while PMSMs can be driven in open loop only. The product family features a compact form factor in a UL open-type construction, with nickel- and tin-plated bus bars and conformal coatings for corrosion protection. Electrical input is nominally rated as three-phase low-voltage ac 400 V (with an allowable input voltage range of 380-480 Vac), and the VFDs come in 14 models with a capacity range of up to 139 A. Each VFD is quadruple rated for varying duties—normal or heavy overload, and mild 40 °C or high 50 °C temperatures. Other advanced functionality includes control of mechanical brakes, a built-in braking transistor, regeneration avoidance and low-voltage ride through. Safe torque off (STO) capability ensures the VFD fulfills functional safety standard requirements while eliminating the need for external circuit breakers required by conventional VFDs. Logic programming with 55 functions, different calculations and sequences and fast processing intervals lets designers eliminate other small controllers and adapt the VFD to meet special requirements. The logic is configured via graphical software, enabling users to create customized automation applications of up to 200 steps, including PID control.
