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<Toc>
5-3
<5. Troubleshooting and Maintenance>
■ Possible Errors during Operation
The following shows possible errors occurring during operations.
Display position
(Note)
Error indication
PV
Displays “RJC” and
PV alternately
RJC error
Measured
with RJC=0
E300
ADC error
105%
Control output
Alarm Retransmis- Commuoutput sion output nication
Normal action
Excessive PV
-5% or 105%
Out of -5 to 105%
OVER or -OVER
Auto-tuning
failure
(Time-out)
E200
Feedback resistor
burnout
Normal
action
Check wires and
sensor.
Normal
action
Normal action
Action with PID
existing before
auto-tuning
Check process.
Normal
action
Normal
Check process. Press
action
any key to erase error
indication.
Stopped
Stopped
Check the feedback
resistor.
Normal action
Normal
action
Check wires and
communication
parameters, and make
resetting. Recovery at
normal receipt
2
Left end of Setpoint
display unit blinks.
Faulty
communication
line
Decimal point at right end Runaway (due to
lights.
defective power Undefined
or noise)
1
No display
All indications off
Power off
Remedy
Faulty
Contact us for repair.
In AUTO:
Dependent on the Preset value output
BSL parameter
In MAN:
PV burnout error
Up-scale: 105% Normal action
Down-scale: -5%
B.OUT
3
Description
of error
0% or less or OFF
0% or
less
OFF
Faulty if power off/on
does not reset start
the unit. Contact us for
Stopped repair.
Check for abnormal
power.
None
Note 1: PV display
2: Setpoint display
3: Display showing the PV of the corresponding loop
■ Remedies if Power Failure Occurs during Operations
The operation status and remedies after a power failure differ with the length of power
failure time:
● Instantaneous Power Failure of 20 ms or less
A power failure is not detected. Normal operation continues.
● Power Failure of about 2 seconds or less
The following show effects caused in “settings” and “operation status.”
Alarm action
Continues. Alarm with standby function will enter standby status.
Settig parameter
Set contents of each parameter are retained.
Auto-tuning
Cancelled.
Control action
Action before power failure continues.
IM 05E01B02-44E
1st Edition : May 31,2000-00