The ACH550 is an variable frequency AC drive designed specifically to meet the requirements of variable speed control in the HVAC market.  It incorporates a wide range of unique functions to provide flexible motor control performance for HVAC applications like cooling tower fans, supply and return fans, and booster pumps and condensers.

The ACH550 is equipped with fourteen pre-programmed HVAC application macros that allow rapid configuration of inputs, outputs, and parameters for specific HVAC applications to maximise convenience and minimise start-up time.

The ACH550 can be used for the simplest to the most demanding HVAC applications. Two internal option slots can be configured with additional relay outputs as well as a host of different communication bus adapters.

Modes of motor control are scalar, vector speed and torque (open and closed loop) for three phase motors of  0.75 kW – 75 kW at 208/240 V, and 0.75 kW – 355 kW at 380/480 V.  Two ranges are available: ACH550-01drives up to 160kw are available in IP21 or IP54 enclosures: ACH550-02 drives from 160-355kW are IP21 free-standing types

The ACH550-01 has a 110% short term overload rating for one (1) minute out of ten (10) and is capable of >130% short-term overload rating for 2 seconds out of each minute. This provides the torque you need to start high inertia fan(s).

User Friendly Operator Control Panel

The ACH550-01 includes an operator control panel that is as easy to understand and use as a cell phone. The standard display mode can be user-configured to show the operating status information that you want to see. The panel is mounted on the front face of the drive and can be hand held or mounted remotely.

Designed specifically for HVAC applications, the operator panel includes HAND, OFF, AUTO and speed INCREASE and DECREASE keys are provided for manual operation. Two multi-function Soft Keys are provided for navigating through the menus and setting parameters. A HELP key pulls up a brief description of the displayed or highlighted item.

The control panel can be connected to and disconnected from the drive at any time. If the drive is running under HAND keypad control, disconnecting the keypad will cause the drive to stop and display a fault message. Alternatively, the drive can be programmed to continue operation after the keypad is disconnected and run at a preset speed or at the average speed over the previous 10 seconds.

Spinning Motor

The ACH550-01 starts smoothly and reliably with a spinning motor connected. If the motor is spinning in the forward direction, the drive simply picks up the motor at its current speed and smoothly accelerates or decelerates to the desired operating speed. If the motor is spinning in the reverse direction the drive decelerates the motor and reaccelerates in the forward direction.

Fan Speed Control

The AHU fan speed is typically controlled to regulate the static pressure in the air duct. The ACH550-01 process PID controller compares the desired pressure (the Setpoint) with the actual pressure (the Feedback) from a pressure sensor and adjusts the fan speed to maintain the pressure at the desired level. The Setpoint is typically entered using the Operator Control Panel or a serial communications command.

Fireman’s Override (Smoke Purge)

This is a dry contact input that causes the drive to ignore keypad and serial communication commands and run at an adjustable preset speed or operate in PID mode. Certain fault conditions are also ignored. This input would typically be used for purging smoke or pressurising an area.

ACH550 is available from 999 inverters at discounted prices