Troubleshooting; On-Board Diagnostics; 4-20Ma Troubleshooting; Trouble Codes - Macurco CX-6 Instrucciones Para El Usuario

Macurco CX-xx Operation Manual

5 Troubleshooting

5.1 On-Board Diagnostics

The CX-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 button (inside the
unit). This will cause the unit to restart the 1-minute self-test cycle.

5.1.1 4-20mA troubleshooting

NOTE: The output from the 4-20ma terminals is steady only when the 4-20mA mode is set to high mode. In dual
mode, fluctuating output will be observed when measured using an ammeter.
• 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 CO, 0-20 ppm NO
•
24 mA indicates a Trouble condition
•

5.1.2 Trouble Codes

If the detector encounters an error, a trouble code is displayed. The trouble code is displayed as "tXXX" where XXX is
a unique trouble code for each sensor. If a trouble code is larger than 800, it is for CO. If it is smaller than 800, it is
for NO . The following table shows the trouble codes for the CO and NO
2
CO Trouble Code
t801
t802
t804
t810
t820
t840
t880
t900
tA00
tc00
REV – 1.1
NO Trouble Code Description
2
t001 Sensor Missing
t002 Temperature Compensation Failed
t004 Bad EEPROM Checksum
t010 Bad EEPROM
t020 Bad Calibration
t040 Never Factory Calibrated
t080 Read ADC Failed
t100 Sensor Under Range
t200 Sensor Expired
t400 Calibration Overdue
Figure 5-1 – Trouble Code Table
[34-2900-0512-0 ]
)
2
sensors.
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