March 2021
Page 108 of 143
59812-K007 Rev 17
Business Confidential
Figure 164
Engine Screen Detector Fault
Select the faulty detector to access the Detector Status Screen.
Figure 165
Detector Status Screen Memory Fault
Identify the fault being indicated, in this case a Memory fault.
Alternatively, an inspection of the engine event log, see section 3.6, will list the event:
Offset Digipot Read Fault
Detector X
Having established which detector is in fault the following steps should be followed.
5.
Disconnect the detector cable from the detector, to remove the power from the detector.
6.
Reconnect the detector.
7.
Accept and Reset the fault.
8.
Check if the memory fault reoccurs.
If the memory fault does not reoccur no further action is required.
If the memory fault reoccurs the detector has failed and should be replaced.
5.2.9
Photodiode Fault
As part of the oil mist measurement process light scattered from the oil mist particles in the sample
chamber is measured by a photodiode. Over time condensing oil can build up on glass in front of the
photodiode causing the light reaching the photodiode to be reduced. The OMD Mk7 Detector monitors the
level of light reaching the photodiode and produces a fault indication if the light level drops below a
predetermined limit.
Testing of the photodiode is performed automatically as part of the system test performed at 16:00hrs
or maybe performed manually via the Optics Test in the Test Menu, see 3.5.
If the light level reaching the photodiode falls below the allowed limit the detector will communicate
the fault to the Control Unit. The Control Unit will then indicate a photodiode fault, see section 5.1.1.
