10.3
Failures and defects of UNIC-flex components
Failures and defects of UNIC-flex components cause failure messages, which are transmitted to
the alarm and monitoring system (AMS).
10.3.1
Failure messages
The UNIC-flex engine control system (ECS) constantly does internal integrity checks and monitors
the connected sensors. UNIC-flex records each unusual condition and makes an event.
•
The system software level does the checks for basic sensor failures.
•
The software application level gives the level of the created event.
Related to the severity of the event there are three levels of messages:
•
Minor failures
This category contains failures that will not cause to decrease the engine load (slowdown)
or to stop the engine (shutdown). But you have to do a check of the message. If necessary
correct the fault as soon as possible.
•
Major failures
This category contains failures that will cause to decrease the engine load (slowdown) and/
or to stop the engine (shutdown). Major failures are divided in the two sub-groups SLD
(slowdown) and SHD (shutdown):
○
The SLD sub-group contains failures that cause one cylinder to cut off. The AMS
sends a slowdown signal to the ECS.
○
The SHD sub-group contains failures that prevent an engine operation. The engine
safety system (ESS) sends a shutdown signal to the ECS. UNIC-flex stops the fuel
injection.
These two sub-groups are not shown in internal or external interfaces. Thus they are only
used on the application level.
If a major failure occurs, the AMS sends a signal to the ECS for a slowdown or shutdown
command. Usually the ECS automatically sets the related setpoint for a slowdown or
shutdown of the engine, refer also to
•
Info logs
This category contains messages which describe engine operation conditions or give more
data to other failures. Related to the functional description only the most important
messages are sent to the AMS.
The table that follows shows some examples of failure messages.
Tab 10-63 Examples of failure messages
ID
Failure text
Failure type
3
Gear Wheel Sensor A Signal Fail
Minor
46
Crank Angle Measurement Fail CCM #2 to #n
Major / SHD
48
Crank Angle Measurement Fail CCM #1
Major / SLD
250
Remote Start Interlock - Main Start Air Valve Manually Closed
Info
X92-B
AA00-0000-00AAC-410C-A
Operation Manual
Failures and defects of UNIC-flex components
Winterthur Gas & Diesel Ltd.
- 338 -
Issue 002 2021-11
