Troubleshooting; On-Board Diagnostics; 4-20Ma Troubleshooting - Macurco CD-6G Manual De Operación

Macurco CD-6G Operation Manual

5 Troubleshooting

5.1 On-Board Diagnostics

The CD-6G monitors all critical functions of the unit through software diagnostics that continuously test and verify unit
operations. If a problem is found, the unit will switch to a fail-safe/error mode or trouble condition. In this error mode, the
Alarm relay will be activated, the 4-20 mA current loop will go to 24 mA, the unit will display the error code, the green status
indicator LED light will flash, and the buzzer will chirp intermittently. The Fan relay will also engage if the Trouble Fan Setting
Option is set to "ON". This is a safety precaution. To clear this mode, simply turn off power to the unit for a few seconds or push
the ENTER/TEST switch (inside the unit). This will cause the unit to restart the 1-minute self-test cycle.

5.1.1 4-20mA troubleshooting.

• 0 mA is most likely a connection problem.
• 4-20 mA is normal gas reading range (0-5.00 % vol)
• 24 mA indicates a Trouble condition.
• 1 mA indicates Calibration Overdue (if 4-20mA is configured to 'EnH')
5.1.2 "t" Error Codes
The CD-6G will display trouble codes indicated by alternating every second "t XX" and "tYYY". E.g., if sensor displays "t 20"
alternating with "t000" then referring "t XX" table it indicates the sensor reading is out of range and in "tYYY" all the fields are 0
so there is not any trouble occurring from "tYYY" table.
t XX
t 01 Sensor Fatal Error
t 02 Sensor Offset Regulation Error
t 04 Sensor Algorithm Error
t 08 Sensor Output Error
t 10 Sensor Self Diagnostic Error
t 20 Sensor Out of Range Error
t 40 Sensor Memory Error
t 80 Calibration Overdue
tYYY
t001 Missing Sensor
At each power-up it checks if that ABC is disabled. If it is not disabled it will try to set it to disable. If it
t002 fails it will trigger trouble t002.
t004 EEPROM bad checksum.
t008 Modbus communication error (during normal operation).
t010 Bad EEPROM
t020 Bad Factory or Field calibration.
t040 Never Factory calibrated.
t080 Bad pressure during factory calibration
t100 Under range. Reading is under -100 ppm for more than 15 seconds
t200 Sensor Expired
t400 Trouble Pressure Sensor
t800 Board not tested
REV – 1.0 [34-2900-0510-9 ]
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