4 Troubleshooting
The
4.1System Status Light Flashing
The system status light (section 3.1.1) is normally green indicating power is present, but will change to yellow whenever the controlling firmware detects a trouble condition. Possible trouble conditions are
–Any configured channel has less than 4 mA flowing in the current loop
–A sensor is reporting a trouble condition
–Any configured channel wiring is open.
–Internal controller board problems are detected.
4.1.1Input Channel Trouble
Any time the POWER light is yellow, the first thing the technician should consider is that one of the input channels is in trouble. Reviewing the Sensor Status displays (using the up and down keys), should reveal which channel has a problem since the gas reading will be replaced with the word TROUBLE.
A common source of trouble is an input channel that is configured for a sensor that does not exist. In this case, the system expects to see current flowing within the current loop, but there cannot be current if there is no sensor connected. Either fix the
If all channels are configured properly, another source of trouble could be the type of sensor attached to an input channel. Macurco Toxic sensors can indicated high gas concentrations with signals of up to 24 mA in the current loop. However, the combustible sensor
All Macurco sensors are either supplied with a STATUS lamp that will indicate the health of the device, or will display a trouble message on the digital display. Macurco sensors may be tested by depressing the TEST button on the sensor printed circuit board, or (depending on the type of sensor), the button on the interior front panel of the unit. Macurco sensors will step the output current level from 4 mA to 20 mA over the course of the
Finally, the wiring between the
Each sensor channel is provided with a
4.1.2 Internal Controller Board Trouble
If the sensor status display and investigative efforts reveal no problems with the input channel current loops and channel configuration, the most likely trouble is an internal problem detected by the
4.2Timed ventilation problem
When using the timed ventilation mode the system clock should be checked regularly (at least twice a year). The battery backed real time clock in the
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