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Example 1: Mains Parallel Operation (setpoint = below rated power)
• Rated generator power = 200 kW
•
• Current power setpoint of the generator = 150 kW (75%)
•
• "Start derating at" = 80 °C water temperature (i.e. analog input AI 01 is defined as
•
free derating source by parameter 15147)
• "Stop derating at" = 90 °C water temperature
•
• "Max. power deviation" = 40% (80 kW)
•
Fig. 279:
Derating: Mains parallel operation; setpoint below rated power
If the engine is running and the LogicsManager 15146 "Free derating" is TRUE, the unit
monitors the water temperature. If the water temperature remains below the value
"Start derating at", the reduction becomes not active and remains on 0%. If the water
temperature increases and so exceeds the value Start derating at the reduction
becomes active (the unit starts to derate the current active power setpoint). The rate of
reduction (slope) is determined by the values of Start derating at, "Stop derating at",
and "Max. power deviation" ("Max. power deviation" also defines the minimum power).
In this example the power reduction would increase and so reduce power from 75% at
86.5 °C down to 60% = 120 kW at 90 °C. Temperature over 90 °C would cause the same
reduction of 40% in this example. So it is guaranteed that the engine is not running with
too less load.
A Setpoint below the Minimum (e.g. 55%) would not run into reduction.
With a smaller Maximum deviation (e.g. 20%) Minimum would be higher than Setpoint
and so not cause reduction.
765
easYgen-3000XT Series
B37574
6 Application Field
6.3.16.2 Derating With Characteristic Curve
Released