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9. Troubleshooting
If any malfunctions occur, refer to the following items after checking that power is being supplied to
the JIR-301-M.
Problem
Possible Cause
Solution
The PV Display
indicates
.
Internal memory is defective.
Contact us or our agency in your region.
The PV Display
indicates
.
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
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.
Check whether the input
terminals of thermocouple,
RTD or DC voltage (0 to 1 V
DC) are securely connected to
the instrument input terminals.
Connect the sensor terminals to the instrument
input terminals securely.
The PV Display
flashes
.
Check whether input signal wire
for DC voltage (1 to 5 V DC) or
direct current (4 to 20 mA DC) is
disconnected.
How to check whether the input signal wire is
disconnected
[DC voltage (1 to 5 V DC)]
If the input to the input terminals of the instrument
is 1 V DC and if a scaling low limit value is
indicated, the instrument 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 the instrument
is 4 mA DC 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 input signal
wire for DC voltage (1 to 5 V
DC) or direct current (4 to 20
mA DC) is securely connected
to the instrument input
terminals.
Ensure that the input signal wire is securely
connected to the instrument input terminals.
Check if polarity of thermo-
couple or compensating lead
wire is correct.
Check whether codes (A, B, B)
of RTD agree with the
instrument terminals.
Wire them correctly.
