Key Operation; Control - Panasonic KT2 Instruction Manual

The PV/SV display is
flashing [ ].
The PV/SV display keeps
indicating the value which
was set during Scaling low
limit setting.
The indication of the PV/SV
display is abnormal or
unstable.
The PV/SV display is
indicating [ ].

12.2 Key operation

Problem
• Unable to set the SV1, P, I,
D, proportional cycle or
alarm.
• The values do not change
by the , keys.
SV2 cannot be set.
The setting indication does
not change within the input
range even if the
keys are pressed, and new
values are unable to be set.
• Check whether the input signal source for DC voltage (1 to 5V DC) or
DC current (4 to 20mA DC) is disconnected.
How to check whether the input signal wire is disconnected
[DC voltage (1 to 5V DC)]
If the input to the input terminals of the instrument is 1V 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.
[DC current (4 to 20mA DC)]
If the input to the input terminals of the instrument is 4mA 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 the input signal wires of thermocouple, RTD or DC voltage
(0 to 1V DC) are securely connected to the instrument input terminal.
Ensure that the sensor terminals are connected to the instrument input
terminals securely.
• Check whether the input signal wires for DC voltage (1 to 5V DC) or DC
current (4 to 20mA DC) are securely connected to the instrument input
terminals.
• Check whether the polarity of thermocouple or compensating lead wire is
correct.
Check whether codes (A, B, B) of the RTD agree with the instrument
terminals. Ensure that they are wired properly.
• Check whether the input signal source for DC voltage (0 to 5V DC,
0 to 10V DC) and DC current (0 to 20mA DC) is disconnected.
How to check whether the input signal wire is disconnected
[DC voltage (0 to 5V DC, 0 to 10V DC)]
If the input to the input terminals of the instrument is 1V DC, and if a
value corresponding to 1V DC is indicated, the instrument is likely to be
operating normally, however, the signal wire may be disconnected.
[DC current (0 to 20mA DC)]
If the input to the input terminals of the instrument is 1mA DC, and if a
value corresponding to 1mA DC is indicated, the instrument is likely to
be operating normally, however, the signal wire may be disconnected.
• Check whether the input lead wire terminals for DC voltage (0 to 5V DC,
0 to 10V DC) or DC current (0 to 20mA DC) are securely connected to
the instrument input terminals.
• Check whether the sensor input and temperature unit (
correct. Set the sensor input and the temperature unit (
• Sensor correcting value is unsuitable. Set it to a suitable value.
• 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 equipment that interferes with or makes noise, away
from the controller.
• Internal memory is defective.
Contact the agent or Panasonic Industrial Devices SUNX Co., Ltd.
• A set value lock mode (Lock 1 or Lock 2) has been selected.
Release the lock mode.
• PID auto-tuning is performing. Cancel auto-tuning.
• No alarm action, Timer function or Pattern end output has been selected
during A1, A2 type selection.
Select an alarm type after checking the selection.
• SV1/SV2 external selection function has not been selected during
DI (Digital input) function selection.
Select SV1/SV2 external selection function after checking the selection.
Not available if Serial communication option is applied.
• Scaling high or low limit value in Auxiliary function setting mode 2 may
be set at the point where the value does not change.
, Set it to a suitable value in Auxiliary function setting mode 2.
Presumed cause and solution
30
or ) setting are
or ) properly.