Problem Possible Cause Solution
PV has dropped below the
Indication range and Control
range.
Check the input signal source and wiring of input
terminals.
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 current (4 to 20 mA
DC) is securely connected to
the instrument input terminals.
Connect the input signal wire to the terminals of
this instrument securely.
[ ] and
[ ] are
alternately indicated
in the PV Display.
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.
[ ] is indicated
in the PV Display.
Hardware malfunction
Contact our agency or us.
[ ], nothing or
PV is indicated in
the PV Display.
Control output OFF function
is enabled.
Press the key for approx. 1 second to cancel
the function.
Check whether sensor input
or temperature unit ( or )
is correct.
Select the sensor input and temperature unit (
or ) correctly.
Sensor correction coefficient
or Sensor correction value is
unsuitable.
Set them to suitable values.
Check whether the
specification of the sensor is
correct.
Use a sensor with appropriate specifications.
AC leaks into the sensor
circuit.
Use an ungrounded type sensor.
The indication of PV
Display is irregular
or unstable.
There may be equipment that
interferes with or makes noise
near the instrument.
Keep the instrument clear of any potentially
disruptive equipment.
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