Industrial Scientific Oldham MX52, Commissioning, Operating And Maintenance Manual

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CONTENTS
1. DESCRIPTION.......................................................................................6
1.1. General ............................................................................................................................ 6
1.2. Rack ................................................................................................................................. 7
1.3. The various printed circuit boards .................................................................................. 7
2. INSTALLATION AND CONNECTIONS...............................................8
.1. Installation: recommendations ........................................................................................ 8
.2. Electrical connections of the MX52 Unit (Fig. 8) ........................................................... 8
2.2.1. Alternative power supply......................................................................................... 8
2.2.2. DC power supply ..................................................................................................... 9
.3. Detectors (Figures 9 and 12) ........................................................................................... 9
2.3.1. Explosimetric detectors of PONT type .................................................................... 9
2.3.2. 3-wire detectors 4-20 mA: 3 connecting wires for shielded cable ........................ 10
2.3.3. 2-wire detectors 4-20 mA: 2 connecting wires for shielded cable ........................ 10
2.3.4. FIRE detectors: 2 connecting wires for shielded cable ......................................... 10
2.3.5. FLAME detectors: 2, 3 or 4 connecting wires for shielded cable depending on
utilization............................................................................................................................... 10
2.3.6. CO2 detector of type “Ventostat VT” ................................................................... 12
2.3.7. Specific case of intrinsic safety detectors .............................................................. 12
2.3.8. Other detectors with standardized current output .................................................. 13
2.3.9. Parking application................................................................................................ 13
.4. Connecting the unit to external devices ......................................................................... 14
2.4.1. Slaving controls ..................................................................................................... 14
2.4.2. 4-20 mA current outputs (Fig. 12) ......................................................................... 15
2.4.3. RS 232 and RS 485 outputs ................................................................................... 15
2.4.4. Remote acknowledgement ..................................................................................... 17
3. STARTING UP......................................................................................17
3.1. Checking the installation ............................................................................................... 17
3.2. Switching on the unit ..................................................................................................... 18
3.3. Operating modes ............................................................................................................ 19
3.3.1. Audio warning device (buzzer) ............................................................................. 19
3.3.2. Light-emitting diodes (LED) (Fig. 26) .................................................................. 19
3.3.3. Alarm thresholds.................................................................................................... 19
3.3.4. Fault thresholds...................................................................................................... 23
3.3.5. Measuring unit ....................................................................................................... 24