Macurco RD-xx User Manual
REV – 2.1
[34-2900-0511-7 ]
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5
Troubleshooting
5.1
On-Board Diagnostics
The RD-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
The 4-20 mA signal can be used for troubleshooting:
•
0 mA is most likely a connection problem
•
1 mA indicates Calibration Overdue (if 4-20mA is configured to ‘EnH’)
•
20 mA is alarm condition
•
24 mA indicates a Trouble condition
5.1.2
“t” Error Codes
Error Codes
tXX
t01
Sensor Fatal Error/ Sensor missing
t02
Temperature compensation failure
t04
EEPROM bad checksum
t08
Sensor is shorted
t10
Bad EEPROM
t20
Bad calibration
t40
Factory calibration failure
t80
Read ADC failure
t100
Under range
t200
Sensor expired / End of Life
t8000 Calibration Overdue
Note
:
i.
For trouble codes over 080 the display will alternate between t_1 and t00 for t100, between t_2 and t00 for t200 and
between t80 and t.00 for t8000.
ii.
T8000 has highest priority among all trouble code i.e. if T8000 error code exist along with other ‘t’ error code then 4-20mA
is 1mA if T8000 exist.
iii.
T8000 is resolved only with successful field calibration.
If the error mode repeats frequently, check for continuous power and proper voltage. If power is not the problem and a unit has
repeating error conditions, it may need to be returned to Macurco for service, per these User Instructions.