Omniflex Omni8m C1477B Series User Manual
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C1477B User Manual (UMC1477BR04) - 9 - Copyright Omniflex2.4 Selecting the Group Alarm (G.A.) Relay Output FunctionThe G.A. relay provided internally offers a changeover contact on the rear terminals.SW1-6 and SW1-7 are used to set the mode of operation of this relay.There are four modes to choose from:1. Relay follows inputThe relay is normally energised.Any abnormal input will de-energise the relay. The relay will re-energise when all inputsreturn to their normal states, regardless of the state of the alarm lamps.This is useful for tracking the actual state of the inputs.2. Relay follows alarm stateThe relay is normally energised.Any alarm state will de-energise the relay. The relay will return to normal when all alarmstates have returned to normal. (i.e. the entire display is off)This is useful for tracking the actions of a local operator in clearing the problem. If a‘fleeting’ alarm sequence is chosen, the relay will remain de-energised until the operatorclears the display.3. Relay acts as hornThe relay is normally de-energised.The relay will energise whenever the internal audible device sounds. The relay will de-energise when the internal audible is silenced (normally by pressing the Silence orAcknowledge Pushbutton).This is useful in environments where the local internal audible will not be heard.4. Relay acts in Multiple Reflash ModeThe relay is normally energised.The relay is de-energised by the first abnormal input state.Upon each subsequent abnormal input state, the relay will momentarily energise (for about1 second), then return to the de-energised state.This is useful when the relay contact is used for example to trigger a dial up alarm, and ifsubsequent inputs going into alarm must also trigger the dial-up alarm.Referring to Table 2-1, select one of the 4 relay modes by setting switches SW1-6 andSW1-7 to the appropriate positions.2.5 Selecting the Inhibit Input ModeInput 8 may be used as a special “input inhibit” input. In this mode, when the Input 8 is in thenormal state, the other 7 inputs perform normally. When the input 8 is in the alarm state, then allfurther input changes are ignored, preventing any further alarms to be displayed. In this mode,the lamp 8 will follow the state of the inhibit function. When the alarm system is inhibited, thelamp 8 will be on. When the alarm system is operating normally and not inhibited, then this lampwill be off.2.6 Inhibit Input SenseSW2-8 contact sense selection switch is used regardless of whether the input 8 is used as anormal alarm or as an input inhibit. |
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