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11. Troubleshooting
If any malfunctions occur, refer to the following after checking that power is being supplied to the controller.
11.1 Indication
Problem Possible Cause Solution
[ ] is flashing on
the PV Display.
Burnout of thermocouple, RTD or
disconnection of DC voltage
(0 to 1 V DC)
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 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.
Check whether the input terminals
of thermocouple, RTD or DC
voltage (0 to 1 V DC) are securely
mounted to the instrument input
terminals.
Connect the sensor terminals to the
instrument terminals securely.
[ ] is flashing on
the PV Display.
The input signal wire for DC voltage
(1 to 5 V DC) or direct current
(4 to 20 mA DC) may be
disconnected.
signal wire is disconnected
[DC voltage (1 to 5 V DC)]
If the input to the input terminals of
this controller is 1 V DC, and if a
value corresponding to 1 V DC is
indicated, the controller is likely to
be operating normally, however, the
signal wire may be disconnected.
[Direct current (4 to 20 mA DC)]
If the input to the input terminals of
this controller is 4 mA DC, and if a
value corresponding to 4 mA DC is
indicated, the controller is likely to
be operating normally, however, the
signal wire may be disconnected.
Check whether the input signal wire
for DC voltage (1 to 5 V DC) or
Direct current (4 to 20 mA DC) is
securely connected to the controller
input terminals.
Connect the signal wire to the
controller input terminals securely.
Check whether the polarity of
thermocouple or compensating lead
wire is correct.
Check whether codes (A, B, B) of
the RTD match with the controller
input terminals
Wire them correctly.
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