Macurco CX-6 Manuel D'instructions page 9

Macurco CX-xx Manual (Rev-1.0) Eng
4. There are two terminals for Power: 12 to 24 VAC or 12 to 32 VDC, with no polarity preference.
5. There are two terminals for the dry alarm relay contacts, again with no polarity preference. The alarm relay
can switch up to 0.5 A 120 V, or 60 VA. The alarm relay is activated if gas reaches or exceeds the alarm
settings. See section 4.5 Configuration "CON" for details on relay settings.
6. The alarm relay can be configured to normally open (default) (N.O.) or normally closed (N.C.) and will
activate:
a. if either the CO or NO
concentration drops below the alarm set point. Note that setting both "ArS.C" and "ArS.n" to "diS"
will disable the alarm relay.
b. during a power up test "PUt".
c. when a trouble condition is present.
7. The dry contact, SPDT fan relay has three terminals. The common (COM.), normally open (N.O.) and the
normally closed (N.C.) contact. The fan relay can switch up to 5.0 A up to 240 VAC. See section 4.5
Configuration "CON" for details on relay settings.
8. The Fan Relay can be configured for latching or non-latching (default) when activated (when the gas
concentration exceeds fan relay set point). Once latched in, power will need to be interrupted or the "TEST"
button pressed to un-latch the relay condition.
9. The Fan Relay will engage if the fan setting Carbon Monoxide or Nitrogen Dioxide concentration is exceeded
for longer than the Fan Relay Delay time. Unless it is configured for latching, the fan relay will disengage
once both of the following conditions have been met:
Carbon Monoxide and Nitrogen Dioxide concentration have dropped below fan setting
•
Fan Relay Run time has been exceeded
•
Note that the "disable" fan setting will cause the fan relay to not engage. The fan relay will engage in trouble
fault condition (if the Trouble Fan Setting Option is set to "ON") and will disengage once trouble fault
condition is cleared.
10. The Current Loop is 4 mA in clean air and 4-20 mA for 0-200ppm CO and 4-20 mA for 0-20ppm NO
are two terminals and polarity is marked on the connector.
NOTE: 22 to 12 AWG wire shall be used. Wire used shall meet the temperature range of the detector i.e. 0°F to 125°
F (-18°C to 52°C).
REV – 1.1
gas concentration exceeds the alarm set point. It will deactivate once the gas
2
Figure 3–1 6-Series 4-20 mA CO Output diagram
[34-2900-0512-0 ]
. There
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