5
Warning: Do not work on the system unless the power is switched off
or isolated.
Caution: Ensure that anti-static handling procedures are observed
applied when working on the system, i.e. Anti- Static Wrist Straps
Prior to conducting fault diagnostics on the OMD system it is recommended to isolate the Pre-Alarm and
Slowdown/Shutdown Relays and the detectors being examined see sections 4.1 and 4.2. In addition, if
the detector head is to be removed from the base the detector cable should be detached from the
detector.
5.1 FAULT INDICATIONS
In the event of a fault occurring on the system an indication of the fault will be provided.
5.1.1 Detector Faults
In the case of a fault with a detector the indications are:
Detector Fault LED on constant
Control Unit Activation of the Fault Relay
Control Unit with membrane Fault indicator on flashing
Detector Fault / Isolate indicator flashing for the detector
in alarm. Flash rate = 1sec on 1sec off for communication
fault, 0.5sec on 0.5sec off for all other faults.
Remote Display Unit Displays the Engine Overview Screen with the engine name
button, under the bar graph, of the engine in fault displayed
in blue.
Figure 148 Engine Overview Screen Fault
Further details on the type of fault indicated can be obtained by either:
1. Examining the detector status, see section 3.7
2. Examining the event-log, see section 3.6
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