IM 05C01E12-41E
20
8.
TROUBLESHOOTING
In the event of an abnormality, perform the following checks as outlined by the flowchart.
Is the controller defective?
Completely inactive?
Normal?
Contact us for repair
Problem solved
Cancel the setting
Key operation failure?
Is the key
locked?
Communication
function included?
No communication capability
Normal?
Correct it
Check the terminal connection
of the power supply
Check key-lock
setting
Display failure?
I/O signal failure?
Communication
failure?
Turn the power off,
then on
Check the communication-
related parameters
Verify the spec. of
communicating partner
Check the
communication wiring
Verify the I/O spec.
of controller
Verify the spec. of
I/O destinations
Check the model
and suffix codes
Check the power
supply voltage
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
■
Error Display during Operation
(1) If the controller displays one of the following, carry out the appropriate remedy for the particular error.
Display
Error content
Remedy
P.Er
Flashing period
on PV display
The parameter is abnormal
Check the settings of all the parameters and set them
at their proper values.
B.o
Input burnout
Check the sensor wiring and correct it.
OOO
PV over-scale
(PV exceeds its effective range.)
Check the input type and range settings and
correct them.
Press any key to stop the flashing.
UUU
PV under-scale
(PV falls below its effective range.)
Communication failure
(for /RS option only)
(2) The controller needs to be repaired if any of the indications in the table below appear.
In these cases, do not try to repair the controller yourself. Order a new controller or contact us for repair.
Display
Unknown (at power-on)
All extinguished (at power-on)
“Err” (at power-on)
Error content
CPU failure
Power source failure
Calibration abnormal
Display
Flashing “Err” (at power-on)
Flashing “Err”
(during operation)
Error content
RAM or ROM failure
A/D converter failure,
RJC failure, or EEPROM failure
■
When Power Failure Occurred during Operation
●
Momentary power failures of less than 20ms (or less than 1ms when
⬙
/V24
⬙
is specified) have no effect on
the controller operation (i.e., normal operation continues).
●
For power failures longer than 20ms (or longer than 1ms when
⬙
/V24
⬙
is specifed), however the status will
be as follows.
(The controller action at power recovery is the same as at power-on.)
• Alarm action: Continues (but alarms with a waiting action enter the waiting state once)
• Setting parameters : Maintained
• Auto-tuning: Canceled
Summary of Contents for UT150
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