Sices HS 315, Техническое руководство

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42 Technical Handbook
The two thresholds are completely independent on each other. The third parameter of each
threshold is a “bit” parameter that allows you to associate to each threshold the following
options:
•
Bit 0
. If this bit is “OFF”, the controller checks if the measure is higher than the
threshold. If this bit is “ON”, the controller checks if the measure is lower than the
threshold.
•
Bit 1
. If this bit is “OFF”, the controller sets to OFF the internal status related to this
analogue measure if the measure is “out of threshold”. If this bit is “ON”, the controller
sets to ON the i
nternal status related to this analogue measure if the measure is “out
of threshold”.
•
Bit 4. If this bit is “ON”, the controller issues a warning if the measure is “out of
threshold”.
•
Bit 5. If this bit is “ON”, the controller issues a latched warning if the measure is “out
of threshold”.
•
Bit 6
. If this bit is “ON”, the controller issues a deactivation if the measure is “out of
threshold”.
•
Bit 7. If this bit is “ON”, the controller issues an alarm (block) if the measure is “out of
threshold”.
•
Bit 08. If thi
s bit is “ON”, the controller checks that the engine is running to activate
possible warnings/alarms configured with the preceding bits.
•
Bit 09. If this bit is “ON”, the controller checks that the mask time for the lube oil
protection has elapsed to activate possible warnings/alarms configured with the
preceding bits.
•
Bit 10. If this bit is “ON”, the controller checks that the GCB is closed, to activate
possible warnings/alarms configured with the preceding bits.
•
Bit 11
. If this bit is “ON”, the controller activates a warning/alarm only if the fuel valve
is activated.
•
Bit 12
. If this bit is “ON”, the controller activates a warning/alarm only if the gas valve
is activated.
•
Bit 13
. If this bit is “ON”, to activate any warning/alarm configured with the preceding
bits, the controller checks the status of any digital input configured with the function
“DIF.2705 - Disable the protections on the analogue measures”. The warnings/alarms
will be activated if no digital input is configured as such, or if they are all OFF.
•
Bit 14
. If this bit is “ON”, the warning/alarm entails the arrest of the fuel pump
•
Bit 16. If thi
s bit is “ON”, the warning/alarm is subject to engine protections override.
You can set any combination of these bit.
Using the two thresholds and the AND/OR logics together, you can activate a digital output
regarding the value of an analogue measure, with hysteresis. Suppose you want to activate a
digital output if plant battery voltage exceeds 30.0 Vdc. First, you must maintain a minimum
hysteresis on the threshold, otherwise, when the plant battery voltage is close to the threshold,
the output will continue to switch on and off, due to minimum variations of the voltage itself.
So, suppose you want to activate the output if the voltage exceeds 30.0 Vdc and deactivate
the output if the voltage is lower than 29.8 Vdc. To do that, we can use, for example, the virtual
analogue input #1 which has been configured to contain the plant battery voltage.
Let us set the parameters as follows:
•
P.4051 (function #1): 4045 (AIF.4045).
•
P.4052
(message #1): “”.