ACH550 Installation, Operation and Maintenance Manual 21
ACH550-UH
Operation
The ACH550 HVAC control panel (ACS-CP-B) features:
General display features
Soft key functions
The soft key functions are defined by text displayed just above each key.
Display contrast
To adjust display contrast, simultaneously press   and   or  , as 
appropriate.
HVAC control panel modes
The HVAC control panel has several different modes for configuring, operating and 
diagnosing the drive. To reach the Standard Display Mode, press EXIT until the LCD 
display shows status information. Select MENU and use UP/DOWN buttons to select 
other modes. The modes are:
• Standard Display Mode – Shows drive status information and operates the drive.
• Parameters Mode – Edits parameter values individually.
• Start-up Assistant Mode – Guides the start-up and configuration.
• Changed Parameters Mode – Shows changed parameters.
• Fault Logger Mode – Shows the drive fault history.
• Drive Parameter Backup Mode – Stores or uploads the parameters.
• Clock Set Mode – Sets the time and date for the drive.
• I/O Settings Mode – Checks and edits the I/O settings. 
• Alarm Mode – Reporting mode triggered by drive alarms.
Status LED
UP
SOFT 
KEY 1
DOWN
OFF
SOFT
KEY 2
HELP (always available)
HAND
AUTO
(Green when normal, 
if flashing or red, 
see Diagnostics.) 
X0201