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Macurco GBC Manual
4 Operations
4.1 Power up
Apply power to the GBC. The Power LED will light up green to indicate the unit is operational.
If the unit is powering the detectors, each detector will cycle through its respected power up cycle. The Macurco Gas
Detector (EX. CM-XX) cycles through an internal self-test cycle for the first minute that it is powered. The detector
will execute the test cycle any time power is dropped and reapplied (i.e., power failure). During the self-test cycle,
the detector 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. The
indicator light (LED) will flash green during the self-test cycle.
If 4-20 mA setting is set to "EnH", CM-xx will transmit information related to calibration period status via 4-20 mA
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 (refer to the specific detector manual for additional information).
4.2 GBC Configuration
4.2.1 GBC Buzzer and Relay Settings
There are two jumpers located on the circuit board to control the onboard buzzer and separating the relays via the
sensor connections.
•
Buzzer Jumper (J7):
o Jumper position 1 & 2 – "Enable". (Default)
o Jumper position 2 & 3 – "Disable".
The Buzzer Jumper controls the buzzer located locally on the front of the enclosure. See Figure 4-1.
REV – 1.2
Figure 4-1 – Buzzer Jumper (J7)
[34-2900-0690-7]
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