88
• Check if polarity of thermocouple or compensating lead wire
is correct.
• Check whether codes (A, B, B) of RTD match with the
instrument terminals.
The PV Display keeps
indicating the value
which was set during
Scaling low limit setting.
• Check whether the input signal wire for DC voltage (0 to 5 V
DC, 0 to 10 V DC) and Direct current (0 to 20 mA DC) is
disconnected.
How to check whether the input signal wire is disconnected
[DC voltage (0 to 5 V DC, 0 to 10 V DC)]
If the input to the input terminals of the instrument is 1 V DC
and if a value (converted value from Scaling high, low limit
setting) corresponding to 1 V DC is indicated, the instrument
is likely to be operating normally, however, the signal wire
may be disconnected, or the sensor may be burnt out.
[Direct current (0 to 20 mA DC)]
If the input to the input terminals of the instrument is 4 mA DC
and if a value (converted value from Scaling high, low limit
setting) corresponding to 4 mA DC is indicated, the
instrument is likely to be operating normally, however, the
signal wire may be disconnected, or the sensor may be burnt
out.
• Check whether the input lead wire terminals for DC voltage
(0 to 5 V DC, 0 to 10 V DC) or Direct current (0 to 20 mA
DC) are securely mounted to the instrument input terminals.
The indication of PV
display is irregular or
unstable.
• Check whether sensor input or temperature unit ( or ) is
correct.
Select the correct sensor input and temperature unit ( or ).
• Sensor correcting value is unsuitable.
Set it to a suitable value.
• Check whether the specification of the sensor is correct.
• AC leaks into the sensor circuit. Use an ungrounded type
sensor.
• There may be equipment that interferes with or makes noise
near the controller. Keep the equipment clear of any
potentially disruptive equipment.
[
] is indicated on
the PV Display.
• Internal memory is defective.
Contact our agency or us.
14.2 Key Operation
Problem
Possible Cause and Solution
• Unable to set the SV,
PID, Event alarm value,
etc.
• The values do not
change by the
,
keys.
• Set value lock (Lock 1 to Lock 4) is selected.
Release the lock in [Set value lock].
• AT or auto-reset is performing.
In the case of AT, cancel the AT.
It takes approximately 4 minutes until auto-reset is finished.
Setting items of each
Event output are not
indicated.
Check if the desired action has been selected in [Event output
allocation].