Table of Contents
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Chapter 5 - Operating the Limit Controller
Prompt
EE Fail
Input 1 Fail
Configuration
Errors
Input 1 Range
PV Limits
Fails Safe
TC Warning
TC Fail
Output 2 Fail
90
Diagnostic Messages
The UDC2800 limit controller performs background tests to verify
data and memory integrity. If there is a malfunction, an error
message is displays. In the case of more than one simultaneous
malfunction, the messages are displayed sequentially on the lower
display. If any of these error messages in Table 4-3 occur, See the
section
Background Tests and Diagnostic Messages
Diagnostic Messages and how to correct the problems that they
indicate.
Description
Unable to write to nonvolatile memory.
Two consecutive failures of input 1 integration.
Configuration Errors—Low limit greater than high limit for PV
or SP
Input 1 Out-of-Range
Out-of-range criteria:
Linear range: ±10% out-of-range
l
Characterized range: ±1% out-of-range
l
PV Out-of-Range
PV = PV + PV bias
Failsafe — conditions for Failsafe are:
EEROM Test Failed
l
Scratch Pad RAM Test Failed
l
Configuration Test Failed
l
Thermocouple sensor is starting to burnout.
Thermocouple sensor is in imminent danger of burning out.
Current Output 2 failure is less than 3.5 mA.
for a list of the
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Table of Contents
Troubleshooting
