LSI LASTEM E-Log, User Manual

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LSI LASTEM E-Log – User’s manual
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1) All algorithms must be in alarm at the same time (AND logic)
2) One algorithm can be in alarm at least (OR logic)
The actuator’s switch-on logic can operate according to low power consumption mode (the actuator
is usually deactivated, and starts in case of alarm), or according to safety mode (the actuator is
usually activated, and it shuts-down in case of alarm). Summarizing explanation in the table below.
Operating logic State Actuator
Low consumption mode
No alarm Actuation output switched-off
Alarm Actuation output switched-on
Safety mode
No alarm Actuation output switched-on
Alarm Actuation output switched-off
In case of one or several measures’ error (for example owing to sensor breaking, no-scale
acquisition, or disconnected cable) it doesn’t modify the present state of the actuator piloted by the
logic that uses the same measures.
The manual activation and deactivation of the actuators, performed by the user directly on the
instrument from
Diagnostic window type 4 (see §4.3.3), does not affect the actuation logics. The
actuation logic deactivates the actuator only if it has previously activated from the logic itself.
The actuation logic begins operation after the first activation of the actuator, even if this occurs
temporally after the deactivation.
The programming of the actuation logics happen by means of the
3DOM program according to two
different phases:
1) Selection of the logics and their calculation parameters (section Logics );
2) Selection of the actuation outputs and their AND or OR modes correlation with the preset
logics (section
Actuators ); note that the same logic can be combined with other different
logics several times, in order to switch over different effectors.
5.5.1. Eolic alarm
The logic uses a wind direction measure to establish the condition of a wind position in a specified
sector for a predefined time. Can be set:

The measure that samples wind direction (degrees);

The starting angle (extreme included) of the direction sector;

The ending angle (extreme included) of the direction sector;

The continuous permanence time of the wind direction inside the defined sector in order to
detect the alarm condition;

The continuous permanence time of the wind direction outside the defined sector in order to
detect the end of the alarm condition.
Both times can be set from 0 seconds to 12 hours; if both times are set to zero, the wind direction in
or out conditions inside the sector are immediately detected.
It is possible to join this logic with an another logic of threshold bypass type (see §5.5.5) applied to
a wind speed measure: in this way it’s possible to refine further the alarm activation (i.e. to activate