Rockwell Automation 900-TC32 Digital Temperature Controllers, Series B - Manual (Page 341)

6-1 Publication 900-UM007D-EN-E - January 2011
Chapter
6
Troubleshooting & Error Indication
Error Displays When an error occurs, the error contents are shown on the controller’s No. 1
or No. 2 display.
This section describes how to check error codes on the display, and the actions
to be taken to remedy the problems.
Input Error
Meaning
The input value has exceeded the control range (refer to Note).
Note: Control Range
Resistance thermometer (RTD), thermocouple input:
– Temperature setting Lower-Limit − 20 °C to temperature setting
Upper-Limit + 20
°C (Temperature setting Lower-Limit −40 °F to
temperature setting Upper-Limit +40
°F)
– Analog input: −5% to +105% of scaling range
Action
Check the wiring of inputs for incorrect wiring polarity for improper or
incorrect connections, and short-circuits and check the Input Type.
If no abnormality is found in the wiring and Input Type, turn the controller
power OFF then back ON again.
If the display remains the same, the Controller must be replaced. If the display
is restored, then the probable cause is electrical noise affecting the control
system. Check for electrical noise. Reroute sensor wires away from high
sources of electrical noise. Use shielded sensor wire and ground the shield at
one end.
Note: With an RTD type input a break in the A, B, or B 1
line is regarded by
the controller as a disconnection.
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