Honeywell 900U02-0100 - Page 215

Revision 10 ControlEdge HC900 Process & Safety Controller User and Installation Manual 201
May 2019
Number
of
Strobes
Possible Cause
Scanner Action
User Action
6
An AI module’s CJ
temperature reading is
indicating a thermal problem.
The scanner determines this
problem not the AI module;
therefore, the module’s status
LED will not indicate this
diagnostic.
Possible reasons for this
diagnostic are:
1. One of the two CJs on the
module is indicating a
temperature reading greater
than 70 degrees C.
2. Both cold-junction sensors
are failing to convert.
3. The CJs are converting
properly, but their
differential is greater than
10 degrees C.
No action is taken.
1. Improve ventilation to rack
2. Replace AI module
6
The scanner determined that a
module has a bad channel. In
this condition, the module’s
status LED will not indicate the
failure because the Scanner
determines the condition, not
the module itself.
No action is taken
Refer to the Bad I/O Channel
Diagnostics on page 197 to
determine the nature of the
problem and possible user
actions.
7
One of the power-supplies
failed.
No action is taken
Replace the power-supply