Measured Temperature Value Is Abnormal - Mitsubishi MELSEC-Q Series User Manual

8
TROUBLESHOOTING
8.2.9
Check Item
Check whether the connected thermocouple or
compensation conductor differs from the setting.
Check whether the connected thermocouple or
compensation conductor is connected reversely.
Check for noise in the thermocouple input.
Check the cold junction temperature compensation resistor
for making cold junction temperature compensation for wire
disconnection or disconnection from the relay terminal block.
Check whether the cold junction temperature compensation
yes/no setting is correct.
Check whether conversion is made with the other
thermocouple set after setting of the offset/gain value
Check whether wiring between the module and terminal
block is correct.
The module was mounted in the limited position in the
system using the power supply module of the Q63P, Q63RP,
Q64P or Q64RP.
8
- 6 8.2 Troubleshooting

8.2.9 Measured temperature value is abnormal

Measured temperature value is abnormal
Table 8.10 Measured temperature value is abnormal
POINT
The module may be faulty if the measured temperature values cannot be read
after proper corrective actions have been taken according to the above check
items. Consult the nearest representative or branch.
Set the thermocouple type connected to the switch 1 or 2 in
the intelligent function module switch setting of GX
Developer.
Connect the thermocouple or compensation conductor
correctly.
Check influence from the ground and adjacent devices, and
take action to prevent noise.
Check that the cold junction temperature compensation
resistor is connected to the relay terminal block and there is
continuity, and if not, connect or change the cold junction
temperature compensation resistor.
Set the switch 4 to the correct position in the intelligent
function module switch setting of GX Developer. (Refer to
Section 4.5.)
Make offset/gain setting again after changing the
thermocouple.
Check that wiring between the module and terminal block is
performed correctly.
Refer to Section 2.1 (2) Restrictions on mountable slot
position in which the module can be installed.
Remedy