Honeywell HC900 Installation And User Manual page 148

Diagnostics and Troubleshooting - User Interface
Table 30 - Scanner Diagnostics
Diagnostic Number
Condition
of
Strobes
High CJ 6
temperature
Wrong module 6
No communication 6
to the module.
Bad channel 6
Bad module 6
138
Possible Cause
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.
(will be confirmed through
experimentation).
The module does not agree with
the module required for the
control scenario.
The scanner is unable to
communicate to the module for
one of the following reasons:
Module is not installed
Backplane problem is inhibiting
the scanner to properly
communicate with the module
See Table 29 - Bad Channel
Diagnostics.
Module is reporting a diagnostic
condition. See Table 28 - Bad
Module Diagnostics.
HC900 Hybrid Controller Installation and User Guide
Scanner Action User Action
No action is taken. 1. Improve ventilation to rack
2. Replace AI module
No action is taken. 1. Verify configuration
2. Replace module with the
No action is taken. 1. Verify configuration
2. Install or replace module.
3. Check for bent pins on the
module.
4. Replace the backplane.
No action is taken See Table 29 - Bad Channel
Diagnostics.
No action is taken. User should inspect the module's
status LED to determine the
nature of the problem. The table
in Table 28 - Bad Module
Diagnostics describes the user
action for the various LED
diagnostics.
correct one.
Revision 5
9/03