45 kW VFD for HVAC pump and fan duty
The Schneider Electric ATV21WD45N4 is a 45 kW Altivar 21 variable frequency drive designed for asynchronous motors in HVAC applications — pumps, fans, and compressors that run on a 380-480 V 3-phase supply. It delivers 65.9 A line current at 480 V and 83.8 A at 380 V, with an apparent power rating of 61.9 kVA at 380 V. The drive is classified as mature in its lifecycle, meaning it is still available through distribution but is not the current-generation product.
Switching frequency and derating
The switching frequency is adjustable from 6 to 16 kHz, with a derating factor applied above 8 kHz. Running at 16 kHz quiets motor whine but reduces continuous output current — plan the thermal budget around the lower end of the range for full-rated power. Transient overtorque capability is 120% of nominal motor torque for 60 seconds, which handles short-duration load spikes like fan inertia during startup without tripping the drive.
Integrated EMC filter and compliance stack
A Class A EMC filter is integrated, meeting EN 55011 Class A Group 1 and multiple IEC 61800-3 environment categories (C1, C2, C3) for conducted and radiated emissions. The drive carries CE marking and complies with IEC 61800-5-1 for safety. Pollution degree 3 per IEC 61800-5-1 means the drive is rated for industrial environments with conductive pollution or dry non-conductive pollution that becomes conductive due to condensation — typical for non-conditioned plant floors.
Dimensions and mounting
The drive measures 34.6 in (880 mm) high, 11.2 in (284 mm) wide, and 13.5 in (343 mm) deep, with a heat sink for convection cooling. Mount vertically within ±10 degrees of plumb for proper airflow.