YOKOGAWA ZR22S, User Manual

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<12. Troubleshooting>
12-4
NOTE
• Measure the thermocouple resistance value after the temperature difference between the
detector tip and the ambient atmosphere has decreased to 50°C or less. If the thermocouple
voltage is large, accurate measurement cannot be achieved.
Error 3: A/D Converter Failure/Error 4: Writing-to-memory Failure
• A/D Converter Failure
It is suspected that a failure has occurred in the A/D converter mounted in the electrical circuits
inside the converter.
• Writing-to-memory Failure
It is suspected that a failure has occurred in an operation writing to the memory (EEPROM)
mounted in the electrical circuits inside the converter.
<Locating cause of failure, and countermeasures>
Turn off the power to the converter once and then restart the converter. If the converter
operates normally after restarting, an error might have occurred due to a temporary drop in the
voltage (falling below 85 V, the least amount of voltage required to operate the converter) or a
malfunction of the electrical circuits affected by noise. Check whether or not there is a failure in
the power supply system or whether the converter and detector are securely grounded.
If the error occurs again after restarting, a failure in the electrical circuits is suspected.
Consult the service personnel at Yokogawa Electric Corporation.
IM 11M13A01-02E