Oldham MX48 - Default Chapter; Table of Contents

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1. DESCRIPTION...........................................................................................7
1.1. General.............................................................................................................................7
1.2. the wall-mounted box.......................................................................................................9
1.3. The various printed circuit boards...................................................................................9
2. INSTALLATION AND CONNECTIONS .............................................. 10
2.1. Installation: recommendations.......................................................................................10
2.2. Electrical connections of the MX48 Unit (Fig. 8)..........................................................10
2.2.1. Alternative power supply.......................................................................................10
2.2.2. DC power supply....................................................................................................11
2.3. Detectors (Figure 12).....................................................................................................11
2.3.1. Explosimetric detectors of PONT type ..................................................................11
2.3.2. 3-wire detectors 4-20 mA: 3 connecting wires for shielded cable.........................11
2.3.3. 2-wire detectors 4-20 mA: 2 connecting wires for shielded cable.........................12
2.3.4. FIRE detectors: 2 connecting wires for shielded cable..........................................12
2.3.5. FLAME detectors: 2, 3 or 4 connecting wires for shielded cable depending on
utilization................................................................................................................................12
2.3.6. CO2 detector of type “Ventostat VT”....................................................................14
2.3.7. Specific case of intrinsic safety detectors ..............................................................14
2.3.8. Other detectors with standardized current output ..................................................15
2.3.9. Parking application.................................................................................................15
2.4. Connecting the unit to external devices.........................................................................16
2.4.1. Slaving controls......................................................................................................16
2.4.2. 4-20 mA current outputs (Fig. 12) .........................................................................17
2.4.3. RS 232 and RS 485 outputs ...................................................................................17
2.4.4. Remote acknowledgement.....................................................................................19
3. STARTING UP ......................................................................................... 20
3.1. Checking the installation................................................................................................20
3.2. Switching on the unit......................................................................................................20
3.3. Operating modes............................................................................................................21
3.3.1. Audio warning device (buzzer)..............................................................................21
3.3.2. Light-emitting diodes (LED) (Fig. 1 and fig 4) .....................................................21
3.3.3. Alarm thresholds....................................................................................................22
3.3.4. Fault thresholds......................................................................................................26
3.3.5. Measuring unit.......................................................................................................27