8 - 4 8 - 4
MELSEC-Q
8 TROUBLESHOOTING
8.2.7 Disconnection detection signal (XC) has turned on
Check Item
Remedy
Check whether RTD is connected securely or not.
Connect it securely.
Check for loose terminal screws.
Retighten the terminal screws within the specified torque range.
Check the connected RTD for wire break.
Make continuity check on the RTD, and replace it if its wire is
broken.
Check whether the channel where no RTD is connected is specified
for conversion enable.
Check the channels which are specified for conversion enable and
the channels where RTDs are connected, and make the conversion
setting correctly.
8.2.8 Temperature conversion value cannot be read
Check Item
Remedy
Check whether the used channel has been set for conversion
disable.
Set it for conversion enable in sequence program.
Check whether the programmable controller CPU is set for STOP.
Set the programmable controller CPU for RUN.
8.2.9 Temperature conversion value is abnormal
Check Item
Remedy
Check whether the RTD differs from the one specified.
Set the RTD connected to the switch 1 in the intelligent function
module switch setting.
Check whether the connected RTD is connected reversely.
Connect the RTD correctly.
Check for noise in the RTD input.
Check influence from the ground and adjacent devices, and take
action to prevent noise.
Check whether conversion is made with another RTD specified after
setting of the offset/gain value.
Make offset/gain setting again for the current RTD.
Summary of Contents for q64rd
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Page 62: ...3 39 3 39 MELSEC Q 3 SPECIFICATIONS MEMO ...
Page 92: ...5 17 5 17 MELSEC Q 5 UTILITY PACKAGE GX Configurator TI X Y Monitor Test 1 OMC refresh ...
Page 98: ...5 23 5 23 MELSEC Q 5 UTILITY PACKAGE GX Configurator TI MEMO ...
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