Macurco CM-6 User instructions - page 11
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Selecting Fan Relay Runtime – “Frr”
To select the Fan Minimum Runtime setting, 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 ninth selection is the “Frr” or
Fan Minimum Run Time. Push Next seven times to get to “Frr” then Enter. If the runtime is “OFF” (disabled)
push Next to change it to 3, 5, 10 or 15 minutes (flashing) then push Enter to confirm the change (solid) and
push Enter again to return to “run” in the Con menu. Push Nextuntil “End” is displayed then push Enter to get
back to normal operation.
Selecting 4-20mA Output Option – “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 tenth selection is the “420” or 4-
20mA Output Option. Push Next eight 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 Nextuntil “End” is displayed then push Enter to get back to normal operation.
Onboard Diagnostics
The CM-6 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 Fan and Alarm relays will be activated, the 4-20 mA current loop will go to 24 mA, the unit will
display the error code and the buzzer will chirp intermittently. This is a safety precaution. To clear this mode,
simply turn off power to the unit for a few seconds, or push the TEST switch (inside the unit). This will cause the
unit to restart the 1 minute self-test cycle.
The 4-20 mA signal can be used for troubleshooting:
0 mA is most likely a connection problem
4-20 mA is normal gas reading range (0-200 ppm)
24 mA indicates a Trouble condition
Error Codes
t01
Sensor is missing
t02 Temperature
compensation
failed
t04
Bad EEPROM checksum
t08
Sensor is shorted
t10 Bad
EEPROM
t20
Bad factory calibration
t40
Factory calibration was not done
t80
SDADC reading failed
NOTE: 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.
Sensor Poisons
The gas sensor in the detector is designed with extreme sensitivity to the environment. As a result, the sensing
function may be deteriorated if it is exposed to contaminants, a direct spray from aerosols such as paints,
silicone vapors, etc., or to a high density of corrosive gases (such as hydrogen sulfide, sulfur dioxide) for an
extended period of time.
MAINTENANCE
The CM-6 does not require regular maintenance. The unit uses a long life electrochemical sensor that has a 7
year life expectancy (in normal conditions). All maintenance and repair of products manufactured by Macurco