IDEC VF1A Doesa variable-frequency drives

IDEC VF1A Doesa VFDs are suitable for speed control in variable and constant torque applications ranging from fans and pumps to specialised equipment. The VFD is capable of driving an induction motor (IM) or a PM synchronous motor (PMSM). IMs can be driven in open loop or closed loop, while PMSMs can be driven in open loop only.

The range features a compact form factor in a UL open construction, with nickel- and tin-plated bus bars and conformal coatings for corrosion protection.

Electrical input is nominally rated as three-phase low-voltage 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 — so users can minimise the number of models needed to handle a wide range of applications.

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 means the VFD fulfils functional safety standard requirements while eliminating the need for external circuit breakers.

Logic programming with 55 functions, different calculations and sequences lets designers adapt the VFD to meet special requirements. The VFD also includes seven digital inputs, two analog inputs, three digital outputs and two analog outputs for added control functionality. A standard option port and RS-485 terminals are included, and the VFD accepts removable terminal cards or optional communication cards for integration with PLCs and other devices.