4-20Ma Output Setting - "420; Troubleshooting; On-Board Diagnostics; 4-20Ma Troubleshooting - Macurco CD Series User Instructions

Macurco CD-xx H/MC Manual
4.5.12 4-20mA Output setting – "420"
To select the 4-20mA Output Option, in normal mode, push the Next button to get to "Con" or the Configuration menu. Then
push the Enter button to enter the Con menu. The twelfth selection is the "420" or 4-20mA Output Option. Push Next eleven
times to get to "420" then Enter. If the 4-20mA is "On" push Next to turn it to "OFF" (flashing) then push Enter to confirm the
change (solid) and push Enter again to return to "420" in the Con menu. Push Next until "End" is displayed then push Enter to
get back to normal operation.

5 Troubleshooting

5.1 On-Board Diagnostics

The CD-xxH/MC 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 (0-5000 ppm)
• 24 mA indicates a Trouble condition

5.1.2 "t" Error Codes

The CD-xxH/MC will display trouble codes indicated by alternating every second "tXX" and "tYYY".
tXX
t01 Sensor Fatal Error
t02 Sensor Offset Regulation Error
t04 Sensor Algorithm Error
t08 Sensor Output Error
t10 Sensor Self Diagnostic Error
t20 Sensor Out of Range Error
t40 Sensor Memory Error
tYYY
t001 Missing Sensor (At Power Up only)
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 calibration.
t040 Never Factory calibrated.
t080 Bad pressure during factory calibration
t100 Under range. Reading is under -100 ppm for more than 15 seconds
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