FAULT CODES
When the Controller detects a fault condition, it signals the specific fault using the Red Status LED and
the Yellow Mode LED (shown below). Under normal circumstances with no error present, the Red LED
is ‘off’ and the Yellow LED blinks at a 1 Hz rate. If no application code is loaded in the Controller, the Red
LED is ‘off’ and the Yellow LED blinks at a 10 Hz rate. All other errors (those specific to the application)
are decoded by observing the ‘blink codes’ generated by the Red and Yellow LED’s.
Yellow LED ( Mode)
Red LED (Status)
System Status
10 Hz Blink rate
Off
No application loaded
1 Hz Blink rate
Off
Application loaded and no error
1 Hz Blink rate
4 bit blink code to describe fault
Application loaded and error
Description of Blink Code Algorithm
If the Yellow LED blinks at an unvarying 1 Hz rate and the Red LED is blinking, the cause of the fault can be
decoded from the Red LED alone as follows : The Red LED will flash a four bit sequence, followed by a
pause, followed by the four bit sequence, the pause, and so on. The long flash, symbolized by a “-“, lasts
approximately one second. The short flash, symbolized by “
●
”, lasts approximately 0.5 seconds.
The pause between the four bit sequence lasts approximately 3.5 seconds.
If more than one fault exists, each fault will be displayed in sequence before being repeated.
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