When Wire Breakage Detection Flag Is On; When E 2 Prom Error Flag Is On; When Detected Temperature Value Cannot Be Read; When Detected Temperature Value Is Abnormal - Mitsubishi Electric AJ65BT-68TD User Manual

6. TROUBLESHOOTING
6.2

When Wire Breakage Detection Flag is On

6.3 When E
6.4

When Detected Temperature Value cannot be Read

6.5

When Detected Temperature Value is Abnormal

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Cause
Connection between thermocouple and
compensating conductor is incomplete.
Terminal screw is loose.
The connected thermocouple or compensating
conductor has wire breakage.
The channel to which thermocouple is not
connected is designated as conversion enabled.
2
PROM Error Flag is On
Cause
Error in the internal memory storing the offset
value/gain value set by user
Cause
The channel used is designated as conversion
disabled.
Programmable controller CPU or master module
error
Cause
The thermocouple connected is different from
what is designated.
Affected by noise.
The Pt100 temperature-measuring resistor that
performs cold contact compensation, is either
broken off or disconnected from the terminal
block.
When performing cold contact compensation
externally, the cold contact compensation by
Pt100 temperature-measuring resistor is
enabled.
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Securely connect the thermocouple and compensating
conductor.
Tighten the terminal screws within the specified torque range.
Check the continuity of thermocouple and compensating
conductor, and replace the broken thermocouple or
compensating conductor.
Confirm the channels for which the conversion enable is
designated and channel to which thermocouple is connected,
then correct the conversion enable designation.
Restart power for AJ65BT-68TD. *1
2
If the E PROM error flag is still on after power restart, contact
the nearest representative or branch regarding the problem, as
hardware may be faulty.
*1 Restart power : Turn on the power supply again, or turn on the reset switch.
Designate the channel as conversion enable in sequence
program.
Confirm the programmable controller CPU and master module.
Designate the thermocouple connected.
Confirm the influence from grounding and adjacent devices,
then take measures against noise.
Confirm the connection and continuity of the Pt100
temperature-measuring resistor on the terminal block, and
connect or replace the Pt100 temperature-measuring resistor.
At the initial data setting, set the Pt100 cold contact
compensation disable flag (RY(n+5)7) to on.
6-3
MELSEC-A
Corrective action
Corrective action
Corrective action
Corrective action