ACS320 | Small HVAC friendly inverter drives from ABB.

The falling prices for low power variable speed drives has increased their use in HVAC applications, and typical uses include fan arrays, supply and return fans, exhaust fans and fume hood fans.

HVAC friendly

In response to this the new ACS320 from ABB has pre-programmed HVAC application macros and the easy to use control panel makes installation and drive setup simple. The control panel on the ACS320 uses HVAC terms and units, removing any guess work, and comes with 18 languages built-in. The unified height and depth of the drive frame sizes minimizes needed installation space.

HVAC functions

The ACS320 comes standard with four embedded communication protocols, including BACnet (MS/TP) for easy integration into building management systems. Built-in real time clock and timers help you optimize energy use. The drive provides full output current at ambient temperatures of up to 50°C without derating.

Built-in software for controlling common HVAC applications includes:

– 2 PID controllers

– Timers with real time clock

– Pump and fan control

– Cooling fan control

– Pump cleaning

– Underload (broken belt) detection

– Pump protection

– Sleep function

– Pipe fill (pre-charge)

HVAC operator panel

The ACS320 operator control panel is designed specifically for HVAC applications. The operator panel includes HAND, OFF, AUTO, and speed INCREASE and DECREASE keys for manual operation. Other features include a HELP key, backlit display, multilingual selections, text / graphic displays and a real time clock. The large display and soft keys make it extremely easy to navigate.

Serial communication

The embedded building automation protocols bring connectivity to major HVAC systems. A single twisted pair cable avoids large amounts of conventional cabling, thereby reducing costs and increasing system reliability.

Fan arrays

Fan arrays use multiple motors that are often controlled by individual drives. The ACS320 offers flexibility in mounting with its compact footprint. Multiple drives in this arrangement provide redundancy ensuring year round comfort. Built-in building automation protocols that come standard with the product allow the user to easily set up and run the drive using BACnet, FLN, N2 or Modbus RTU reducing commission time.

Supply and return fans need to maintain air quality in spaces throughout commercial buildings, schools and hospitals. The ACS320 provides a selection of single phase 230V, three phase 230V and three phase 480V drives rated up to 22kW in a compact, flexible design. Whether it is cold winter nights or hot summer days, the rugged design can handle the environmental extremes with a -10 to 50 °C (14 to 122 °F) ambient temperature rating, while keeping occupants comfortable.

Go here for more on variable speed drives for small HVAC fan and pump motors