C1477B User Manual (UMC1477BR04)
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Copyright Omniflex
6. OPERATION
6.1 Power-up
When power is applied to the Omni8
, the unit commences an automatic, built-in circuit test
routine. This results in the unit sounding the audible for approximately half a second followed by
the cyclic illumination of each lamp in turn from 1 to 8 and back to 1 again etc. i
n a “marching
sequence”.
If no internal faults are detected in the unit, then this test mode display continues until the
Acknowledge Pushbutton is pressed or until an input enters the alarm state.
If a fault was detected, then the unit will display a fault indication by continuously flashing one of
the lamps. If this occurs, then the unit must be sent for service.
If a new alarm occurs while the Omni8
is in this test routine, the unit will immediately revert to
its normal mode of operation and will deal with the alarm state according to the pre-selected
alarm sequence.
6.2 Normal Operation
During the normal operation, the Omni8
will act upon any alarm states according to its pre-set
alarm sequences. (The instructions for setting-up these sequences are given in SECTION 3.3).
Section 8 provides detailed block diagrams for the function of each alarm sequence.
When an alarm condition occurs and the horn sounds, the operator should depress the relevant
pushbuttons, where necessary, according to the pre-selected alarm sequence.
When the Omni8
is put into its test routine by depressing the TEST pushbutton, any existing
alarm states are “remembered” and the alarm annunciator will revert to its previous state when it
returns to its normal mode of operation.
If a new alarm state occurs while the Omni8
is performing its test routine, the unit will
immediately revert to its normal mode of operation and deal with the alarm state according to
the pre-selected alarm sequence.
6.3 Test Functions
6.3.1
Overview of the Test Functions
The Test button operates as a combined lamp test and circuit test function.
No information is lost during the entire test routine, and each alarm display returns to the
exact state it was in before the test.
6.3.2
Pressing the Test Button
When the Test button is pressed, the unit checks the results of its regular full circuit test,
and if all checks performed pass, then a normal lamp test is performed by illuminating all
of the lamps while the Lamp Test Pushbutton is held down.
If the ci
rcuit Test fails then the unit enters its “marching sequence” test routine described in
Section 6.3.5 and the test failure code will be displayed by flashing one of the lamps
continuously.
In this way, the display/annunciator Test button acts both as a Lamp Test and Circuit
Function.
6.3.3
Fault Indication on Circuit Test
If a fault is found in one of the tests performed, then the unit enters its full “marching lamp
sequence”, with, in addition, one or more of the lamps flashing continuously to indicate the
fault located. This is described in detail in Section 6.3.5
