Rockwell Automation 61C544A RTD Module - Manual (Page 46)

5Ć2
DANGER
THIS EQUIPMENT IS AT LINE VOLTAGE WHEN AĆC POWER IS CONNECTED.
DISCONNECT AND LOCK OUT ALL UNGROUNDED CONDUCTORS OF THE AĆC
POWER LINE. FAILURE TO OBSERVE THESE PRECAUTIONS COULD RESULT IN
SEVERE BODILY INJURY OR LOSS OF LIFE.
Turn off power to the module.
If an out of range condition exists, check for an open or
shorted wire between the terminal board assembly and
theRTD.
Turn on power to the module.
Step 5. Verify that the user application program is correct.
For DCS 5000/AutoMax systems, verify that the application
program that references the symbolic names associated
with themodulehas declared thosenames COMMON in
theapplication tasks.
Verify that the symbolic name in question is being
referenced in the application program. This can be done
indirectly by monitoring thesymbolic namewith the
MONITOR function in theReSourceSoftware.
For both DCS 5000/AutoMax and AutoMatesystems,
verify that the application program is executing fast
enough to catch all of the input changes.
Step 6. Verify that the hardware is working correctly.
DANGER
THIS EQUIPMENT IS AT LINE VOLTAGE WHEN AĆC POWER IS CONNECTED.
DISCONNECT AND LOCK OUT ALL UNGROUNDED CONDUCTORS OF THE AĆC
POWER LINE. FAILURE TO OBSERVE THESE PRECAUTIONS COULD RESULT IN
SEVERE BODILY INJURY OR LOSS OF LIFE.
Verify hardware functionality by systematically swapping
out modules in the rack. Make certain power is off before
removing any module from the rack. After each swap, if
the problem is not corrected, replace the original module
before swapping out the next one.
5.2 The OK" LED is Off
Problem: TheOK" LED on theRTD modulefaceplateis off. This LED
is on when the module passes its powerĆup diagnostics and is
operating properly. The LED is off when the module fails its powerĆup
diagnostics, when the calibration voltage is out of range, or when a
watchdog timeout error occurs. If the LED remains off after system
powerĆup, replace the module as described in section 3.3.