ECON-4, SW version 1.4 rev.1, ©ComAp – March 2016 Draft 37
ECON-4 Reference guide.pdf
Overspeed protection
In case the actual RPM crosses RPM value: Engine RPM: Overspeed, then the Gas Dose is
immediately forced to the zero – throttle is closed and shutdown is issued.
There is proactive action taken to try to keep engine running without shutdown, when actual RPM
reaches value in the middle between Nominal and Overspeed value. In this case, when RPM crosses
this middle value, Gas Dose is set to Idle position and when RPM drops back below this middle value,
speed PID will continue to regulate RPM.
Purpose of this behavior is to prevent the Overspeed situation by detecting the RPM increase and
step change of the fuel (closing the fuel). As the RPM are dropping down subsequently towards the
Nominal RPM the fuel is changed again to maintain the RPM on Nominal value and not to cause a dip
in the RPM.
Overspeed protection in ECON4-ADV
Instead of value in the middle between Nominal and Overspeed there is additional RPM level defined
in setpoint Engine RPM: PreOverSpeed in ECON4-ADV versions. When RPM reaches this level, Gas
Dose Value (throttle position) goes to value in setpoint Engine RPM: PreOverSpReduct – can be set
to Idle Fuel or Close.
This feature was added to prevent overspeed when Load is removed – typically switch off large load in
island operation.
To Next Page
Loading...
Need help?
General
