Omni30 User Manual
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© Omniflex
UMC1620AR04
4.4 Selecting the Group Alarm Output Function
The Group Alarm (G.A.) output provides a transistor switch on terminal GP of each Alarm Module.
SW1-6 and SW1-7 are used to set the mode of operation of this output.
There are four modes to choose from:
1.
Relay follows input
The relay is normally energised.
Any abnormal input will de-energise the relay. The relay will re-energise when all inputs
return to their normal states, regardless of the state of the alarm lamps.
This is useful for tracking the actual state of the inputs. Any abnormal input will cause the
relay to be de-energised.
2.
Relay follows alarm state
The relay is normally energised.
Any alarm state will de-energise the relay. The relay will return to normal when all alarm
states have returned to normal. (i.e. the alarms have been acknowledged by the operator
and 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 operator clears the
display, even though the input contact may have already returned to the normal state.
3.
Relay acts as ring-back horn
The relay is normally de-energised.
The G.A. relay will energise when any abnormal input returns to normal. The RESET
pushbutton must be depressed to return the G.A. to its normal state.
(This G.A. type can be used to alert an operator to the fact that an alarm has returned to its
normal state).
4.
Relay acts in Multiple Reflash Mode
The relay is energised with all inputs in their normal state.
The relay is de-energised by the first input changing to the abnormal state.
Upon each subsequent input changing to the abnormal state, the relay will momentarily
energise (for about 1 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 if
subsequent inputs going into alarm must also trigger the dial-up alarm.
Referring to Table 4-1: The Sequence Switch Settings, select one of the 4 relay modes by
setting switches SW1-6 and SW1-7 to the appropriate positions.
4.5 Selecting the Lamp Status
The lamp status of the display windows may be selected on SW2-8 to give the following:
NORMAL:
lamps OFF when inputs are normal, ON when inputs are abnormal.
REVERSE:
lamps ON when inputs are normal, OFF when inputs are abnormal.
Note: SW1-8 must be off for this selection to be operational. When SW1-8 is on, SW2-6 is
reassigned, and the lamp status defaults to Normal.
4.6 Selecting Time Delays
The Omni30 Alarm modules have a timer associated with each alarm point.
These timers are used with special Timer sequences. A large “T” in the sequence diagram in
Section 7 identifies these sequences.
There are two methods of selecting a time delay setting for these sequences:
