37 kW, 380-480 V — HVAC-duty VFD with integrated EMC filter
The ATV21WD37N4C is a 37 kW Altivar 21 AC drive designed for asynchronous motors in HVAC, pumping, and fan applications. It accepts a 380-480 V 3-phase supply and delivers 54.4 A line current at 480 V (68.9 A at 380 V). An integrated Class B EMC filter meets EN 55011 Group 1 Class B, which simplifies panel layout by eliminating the need for an external filter in most commercial installations. The drive carries CE marking and complies with IEC 61800-3 across multiple environment categories (C1, C2, C3), so it fits both residential and industrial EMC zones.
Switching frequency, torque, and speed regulation
Switching frequency is adjustable from 6 to 16 kHz; above 8 kHz a derating factor applies, so plan for reduced continuous current if motor noise suppression is the priority. Transient overtorque reaches 120 % of nominal motor torque for 60 seconds, useful for breakaway loads on conveyors or fans. Speed accuracy is ±10 % of nominal slip from 0.2 Tn to Tn, with an adjustable PI regulator loop for closed-loop process control. Torque accuracy is ±15 %, adequate for most HVAC and pumping duty where precise torque holding is not critical.
Dimensions, mounting, and environmental ratings
The drive measures 34.6 in (880 mm) high by 11.2 in (284 mm) wide by 13.5 in (343 mm) deep — a tall, narrow footprint that fits standard 600 mm deep cabinets. Mounting is vertical within ±10°, with a heat sink assembly for convection cooling.