Troubleshooting; On-Board Diagnostics; 4-20Ma Troubleshooting; T" Error Codes - Macurco CM-6 Manuel

Macurco CM-6/CM-12 Manual (Rev-1.1) Eng

5 Troubleshooting

5.1 On-Board Diagnostics

The CM-xx 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
• 1 mA indicates Calibration Overdue (if 4-20mA is configured to 'EnH')
•
4-20 mA is normal gas reading range (0-200 ppm)
•
24 mA indicates a Trouble condition

5.1.2 "t" error codes

tXX
t01
t02
t04
t08
t10
t20
t40
t80
t100
t200
t8000
NOTE:
I. T8000 has highest priority among all trouble code i.e. if T8000 error code exist along with other 't' error code then the
4-20mA output is 1mA if T8000 exist.
II. T8000 is resolved only with successful field calibration.
III. If there are multiple error codes existing at the same time, the displayed code will be the sum of error codes. E.g. Unit
will display t03 if t01 and t02 exist at same time, t180 if t100 and t80 exist at the same time etc.
If the sum for a digit (ones, tens or hundreds) is greater than 9, it will display corresponding hexadecimal
representation of the sum. Following table shows the hexadecimal representation for number from 10 to 15.
REV – 1.1
Sensor Fatal Error/ Sensor missing
Temperature compensation failure
EEPROM bad checksum
Sensor is shorted
Bad EEPROM
Bad calibration
Factory calibration failure
Read ADC failure
Under range
Sensor expired / End of Life
Calibration Overdue
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