Ohio Medical Area Installation And Maintenance Manual
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Ohio Medical Corporation., 1111 Lakeside Drive, Gurnee, IL 60031-4099 (800/448-0770) www.ohiomedical.comMedical Gas Alarm Manual ■ 255098 (Rev.8) 07/08Page 174.4 Master Alarm Connections from Source EquipmentEach Master Alarm Panel may accommodate up to 10 alarm inputs. Dry Contacts fromsource equipment are connected directly to the Master Alarm Panel circuit board at positions“MA1” through “MA10”. Each of these contact points is clearly marked on the circuit boardand includes both positive (+) and negative (-) terminals. The dry contacts from the sourceequipment must be rated for at least 12 VDC .WARNING — THE EQUIPMENT THAT IS CONNECTED TO THIS INTERFACE IS NOTCONSIDERED TO BE PART OF THE SYSTEM CONFIGURATION UNLESS THE EQUIPMENTIN QUESTION COMPLIES WITH THE STANDARD FOR HOSPITAL AND SIGNALING ANDNURSE CALL EQUIPMENT, UL 1069The “Maintenance Mode” switch needs to be on to disable the audible alarm while wiringcontacts to the master alarm module. To make the Maintenance switch active, move theswitch at position “S11” on the Master Alarm Module toward the row of switches labeled “S1”to “S10” as shown in Figure 8A. The maintenance lamp will be illuminated on the front of thepanel. Moving the switch away from the row of switches will restore the Master Alarm tonormal operation.Switch settings on the Master Alarm Panel must be set to configure each alarm point fornormally open or normally closed operation. As shown on Figure 8A, the switches are onthe headers labeled “S1” through “S10”. The switches at position “S1” corresponds to thealarm connected to the first pair of contacts “MA1”, “S2” to “MA2”, “S3” to “MA3”, and so on.If one of the S1 through S10 switches is positioned toward the “S11” switch, the circuit loop isnormally open. It will cause an alarm when a closed contact is applied to the input terminalstrip (MA1-MA10). The switches at positions S1 & S3-S10 are shown in this position inFigure 8A. This is the factory default setting. Any pair of contacts that are not connected tosource equipment should have their corresponding switch positioned toward themaintenance switch.If one of the S1 through S10 switches is positioned away from the S11 switch, the circuit loopis normally closed. The contact will create an open circuit loop when an alarm conditionexists. The S2 switch is shown in this position in figure 8A. This is the setting for inputcontact that is closed during normal operation but open during an alarm condition.Per NFPA 99, information relayed from the source equipment is to be sent to two separatemaster alarm panels at separate locations inside the medical facility. Wiring from thesource equipment is to be ran in parallel to each master alarm module and can not to beslaved from one master alarm panel to the another. |
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