Operating Instructions

Basics of Troubleshooting
Siemens Building Technologies, Inc. 5-3
NOTE: The ATEC has a built-in checkout procedure that can be manually initiated at any
time after the controller has been installed. This procedure tests all of the necessary
I/O and ensures the controller has the ability to operate within the set airflow range.
(See page 5-6 for details.)
Preventive Maintenance
Most controller components, under normal circumstances, are designed so that they do not
require preventive maintenance. Periodic inspections, voltage checks, and point checks are
normally not required. The controller's rugged design makes most preventive maintenance
unnecessary. However, devices that are exposed to dusty or dirty environments may require
periodic cleaning to function properly.
Safety Features
The controller board stores the controller's address, applications, and point values. In the event of
a power failure or a reset, these values are retrieved from the controller's permanent memory and
are used by the controller unless overridden by a field panel. If one of the following conditions
occurs, safety features present in the controller will activate its fail-safe mode.
• Sensor failure.
• Loss of power. Upon controller power loss, communication with the controller is also lost.
The controller will appear as failed (*F*) at the field panel or portable operator’s terminal.