June 08, 2026

9VT401-005HTNNN Rockwell Automation VTAC 9 HVAC Variable Frequency Drive

The 9VT401-005HTNNN is a compact, high‑efficiency VTAC 9 series HVAC variable frequency drive (VFD) manufactured by Rockwell Automation (formerly Reliance Electric). Designed for 3‑phase AC motor control in heating, ventilation, and air‑conditioning (HVAC) systems, it delivers precise speed regulation, energy savings, and robust performance in commercial and industrial environments.

Description

9VT401-005HTNNN Rockwell Automation VTAC 9 HVAC Variable Frequency Drive

Product Overview

The 9VT401-005HTNNN is a 5 HP (3.7 kW) VFD engineered specifically for HVAC fan and pump applications. It converts fixed‑frequency AC power into adjustable‑frequency, adjustable‑voltage output to control motor speed, matching airflow or fluid demand and reducing energy consumption. Built on the proven VTAC 9 platform, it integrates advanced control algorithms, a user‑friendly interface, and comprehensive protection features in a space‑saving, rugged enclosure.

Key Specifications

Part Number: 9VT401-005HTNNN
Manufacturer: Rockwell Automation (Reliance Electric)
Product Series: VTAC 9 HVAC Drive
Rating: 5 HP (3.7 kW), 3‑phase
Input Voltage: 432–528 VAC (480 V nominal), 47–63 Hz
Input Current: 6.5 A
Output Voltage: 0–460 VAC
Output Frequency: 0–400 Hz (default base frequency: 60 Hz)
Output Current: 7.5 A (continuous); 1‑min overload: 9.4 A; 3‑sec overload: 12.8 A
Control Modes: V/Hz (volts‑per‑hertz) with HVAC optimization, sensorless vector
Communication: Built‑in RS‑485 (Modbus RTU); optional EtherNet/IP, DeviceNet
Keypad: Integrated LCD keypad with copy/paste functionality, multi‑language support
Enclosure: NEMA 1 (IP20), compact vertical mount
Operating Temperature: 0°C to +40°C (32°F to 104°F)
Dimensions (H×W×D): Approx. 406 × 152 × 203 mm (16 × 6 × 8 in)
Weight: Approx. 11.3 kg (25 lb)
Status: Active / Current production (widely available)

Core Features and Benefits

HVAC‑Optimized Control: Preconfigured V/Hz profiles for fans and pumps reduce energy use by up to 50% compared to fixed‑speed operation.
Compact Footprint: Space‑saving vertical design fits in standard HVAC control panels, simplifying retrofit and new installations.
Intelligent Keypad: Backlit LCD with plain‑text diagnostics, quick startup wizards, and parameter copy/paste for fast setup of multiple drives.
Robust Protection: Overvoltage, undervoltage, overcurrent, short‑circuit, ground fault, overtemperature, and motor overload protection; fault logging with time stamps.
Flexible Communication: Native Modbus RTU enables seamless integration with building management systems (BMS); optional industrial Ethernet for advanced connectivity.
Quiet Operation: Low‑noise switching technology reduces acoustic interference in occupied spaces.
High Reliability: Conformal‑coated PCBs, corrosion‑resistant enclosure, and long‑life capacitors ensure durability in commercial HVAC environments.
Easy Maintenance: Modular design with accessible terminals and replaceable cooling fan minimizes downtime.

Applications

The 9VT401-005HTNNN is designed for commercial and light industrial HVAC systems, including:

Supply and return air fans
Chilled water and hot water pumps
Cooling tower fans
Exhaust fans
Air‑handling units (AHUs)
Rooftop HVAC units
Retrofit projects for existing fixed‑speed motor systems

Lifecycle and Availability

Production Status: Active, current‑generation product.
Availability: Readily stocked by Rockwell Automation and authorized distributors; new units with standard lead times.
Warranty: 18‑month manufacturer’s warranty; extended warranty options available.
Support: Full technical support, firmware updates, and replacement parts from Rockwell Automation.

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