Operations; Power Up; Display Turned "On; Display Turned "Off - Macurco CM-6 Instrucciones De Utilizacion

Macurco CM-6/CM-12 Manual (Rev-1.1) Eng
3.3.2.4 4-20 mA Signal Connection
The positive and negative 4-20mA signal connections (+ and -) are available at the 4-20mA modular connector, a 2-position
connector. To install the wiring for the 4-20 mA contacts, disconnect the connector from the header on the detector. Strip the
insulation of each wire back approximately 1/4 in. (6.5 mm), insert the bare wire into the terminal and tighten the screw clamp.
Ensure that the wire cannot easily be pulled from the connector. When the wires are connected seat the modular connector
into the header ensuring that the latch engages

4 Operations

4.1 Power up

The CM-xx cycles through an internal self-test cycle for the first minute that it is powered. The unit will execute the test cycle
any time power is dropped and reapplied (i.e. power failure). During the self-test cycle the unit will display the firmware version
number, then count down from 60 to 0 (if the display setting is "On") and finally go into normal operation. The alarm relay will
be activated for 10 seconds and the fan relay for 60 seconds during the power-up cycle unless the "Power Up Test" (PUt) option
is OFF. The indicator light (LED) will flash green during the self-test cycle. If 4-20mA setting is set to "EnH", CM-xx will transmit
information related to calibration period status via 4-20mA output during power-up cycle. At the end of the 1-minute cycle, the
unit will take its first sample of the air and the indicator light will turn solid green.

4.2 Display turned "On"

Clean Air – With the display function turned "On", the CM-xx will show the current concentration of CO ppm or "0" (zero) in
clean air.
Fan level – When the CO concentration reaches the Fan Relay setting (35 ppm, for example) the display will flash back and forth
between "FAn" and "35" or current concentration of gas.
Alarm level – With the display function turned "On" and the CO concentration reaching the Alarm Relay setting, (200 ppm, for
example) the display will flash back and forth between "ALr" and "200" or current concentration of gas. The buzzer will sound
indicating "Alarm" if the buzzer is turned "On".
Trouble – With the display function turned "On" and the device is in a trouble state, the display will display the "t" Error code
(t01 for example). If the Trouble Fan Setting is enabled, the Fan relay will switch activating the relay. See section 4.5.11 Trouble
Fan Setting – "tFS" and section 5.1.2 "t" Error Codes and
Calibration Due- With Calibration Period functionality enabled, if a detector is within 1 month of calibration period, then display
will flash back and forth between "dUE" and current gas reading. Calibration Due is resolved only with successful field
calibration.

4.3 Display turned "Off"

Clean Air – With the display function turned "Off", the display does not show the CO concentration. Only the Power indicator
light on will be on.
Fan Level – When the CO concentration reaches the Fan Relay setting (35ppm, for example) the display will show "FAn"
continuously as long as the fan relay is enabled. This appears as slowly flashing "FAn".
Alarm Level – With the display function turned off the display does not show the CO concentration but will show "ALr" when the
Alarm relay is activated.
Trouble – With the display function turned "Off" and the device is in a trouble state, the display will display the "t" Error code
(t01 for example). If the Trouble Fan Setting is enabled, the Fan relay will switch activating the relay. See Section 4.5.11 Trouble
Fan Setting – "tFS" and Section 5.1.2 "t" Error Codes.
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