Troubleshooting; Indication - Panasonic KT4R User Manual

12. Troubleshooting

If any malfunctions occur, refer to the following items after checking that power is being supplied to
the controller.

12.1 Indication

Problem
[ ] is indicated
in the PV Display.
[ ] is indicated
in the PV Display.
PV and [ ] are
alternately indicated
in the PV Display.
PV and [ ] are
alternately indicated
in the PV Display.
[ ] and
[ ] are
alternately indicated
in the PV Display.
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Possible Cause
Internal non-volatile IC
memory is defective.
Data writing (in non-volatile
IC memory) error when
power failure occurs.
Overscale.
PV has exceeded Input range
high limit value (scaling high
limit value for DC voltage,
current inputs).
Underscale.
PV has dropped below Input
range low limit value (scaling
low limit value for DC voltage,
current inputs).
PV has exceeded the
Indication range and Control
range.
Burnout of thermocouple,
RTD or disconnection of DC
voltage (0 to 1 V DC)
Check whether the input
terminals of thermocouple,
RTD or DC voltage (0 to 1 V
DC) are securely mounted to
the instrument input terminals.
Solution
Cancel the error code by pressing the
and perform data clearing. (p.92)
If the problem is not still solved, contact our
agency or us.
Cancel the error code by pressing the
and perform data clearing. (p.92)
Check the input signal source.
Check the input signal source and wiring of input
terminals.
Check the input signal source.
Replace each sensor.
How to check whether the sensor is burnt out
[Thermocouple]
If the input terminals of the instrument are
shorted, and if a value around room temperature
is indicated, the instrument is likely to be
operating normally, however, the sensor may be
burnt out.
[RTD]
If approx. 100 of resistance is connected to
the input terminals between A-B of the instrument
and between B-B is shorted, and if a value
around 0 (32 ) is indicated, the instrument is
likely to be operating normally, however, the
sensor may be burnt out.
[DC voltage (0 to 1 V DC)]
If the input terminals of the instrument are
shorted, and if a scaling low limit value is
indicated, the instrument is likely to be operating
normally, however, the signal wire may be
disconnected.
Connect the sensor terminals to the instrument
input terminals securely.
key,
key,