Error display (trouble shooting)
When an error has occured, the No. 1 display alternately indicates error codes
together with the current display item.
AT (auto-tuning)
AT in adjustment level
Designate " : AT execute" to execute
AT and " : AT cancel" to cancel AT.
Also when AT execution ends, the display
automatically returns to " ".
Example
Run time for auto-tuning varies with the thermal
capacity of the control system.
No. 1 display Meaning
Input error
*2
Check the wiring of inputs, disconnections, shorts,
and input type.
After the correction of input error, turn the power OFF
then back ON again. If the display remains the same,
the controller must be repaired. If the display is restored
to normal, then a probable cause can be external noise
affecting the control system. Check for external noise.
Turn the power OFF then back ON again. If the display
remains the same, the controller must be repaired. If the
display is restored to normal, then a probable cause can
be external noise affecting the control system. Check for
external noise.
A/D converter
error
*2
Memory error
Action
Status at error
Control
output
Alarm
OFF
Operates as
above the
upper limit.
OFF
OFF
OFF
OFF
(S. Err)
(E111)
In the input value exceeds the display limit (-1999(-199.9) to 9999(999.9)), though it is within the control
range, will be display under -1999(-199.9) and above 9999(999.9). Under these
conditions, control output and alarm output will operate normally.
Refer to "E5CN User's Manual" for details of control range.
*2: Error shown only for "Process value / Set point". Not shown for other status.
(E333)
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