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motcom® BeCOMS® | BCom
User Manual
Release
130301 (revision 190211)
Page 3.4
There are 3 alarm relays integrated in the BCom Evaluator:
• 1
st
Alarm relay: always assigned to main alarm, aditionally programmable as pre-
alarm or over speed alarm
• 2
nd
Alarm relay: programmable as main alarm or pre-alarm or both and/or over-
speed alarm
• 1 Ready relay: indicates the system status
The BCom has a self check procedure which is carried out in a certain cycle. If any
one of the conditions for System Ready status is not detected the BCom Evaluator
switches off the GREEN READY LED and the Ready relay opens. Error code and
text error message are shown on the LCD display of the Evaluator and also in the
event window of BCom Data_Logger on the monitoring computer.
BCom enables to set different alarm sensitivity levels by defining different thermo
voltage signal thresholds as alarm condition. Thermo signal alarm levels are
encoded as numbers from 1 to 5 (the higher the number is the less sensitive is the
system).
Over-speed alarm level is given in RPM.
Alarm sensitivity levels must be set at the BCom Evaluator. If alarm conditions are
fulfilled, the firmware of the BCom Evaluator triggers the corresponding alarm.
The BCom monitoring software on the computer does only registering, recording,
displaying and storing data!
For example, the following set of conditions should be met in BCom in order to
trigger Main Alarm:
1) The GREEN READY LED has to be on.
2) The measured thermo voltage signals should be higher than the pre-set alarm
level over a certain period of time.
3) The increase of these measured signals over time should be higher than a certain
value.
4) The engine rotation speed should be higher than pre-set minimal value.
If BCom Evaluator triggers Main Alarm it does not mean that the affected parts have
been damaged irreparably.
Depending on the pre-set alarm level and on wiring to the engine site alarm
devices, Main Alarm alerts the operator that the tolerated level has been exceeded,
indicating that further investigation of BCom signals is needed, and may initiate an
engine shutdown.
3.4. Alarm Setting and Triggering