9 Commissioning
46 KRONOS 20
If the variation is greater:
change the reference values (988 MeasPowerSensorLow and 989 MeasPowerSensorHigh)
of the power sensor input signal at different loads so that P
mea
= P
act
D) The calculated lambda value must correspond roughly to the desired lambda
value
(calibration of 9500 - 9583 MechEffMap or 1413 MechEfficiencyConst)
If λ
cal
(3463 LambdaActualValue) = λ
des
(3462 LambdaDesiredValue),
(within ± 1 %), then continue with E)
When λ
cal
< λ
des
then:
1a. Increase η
set
(9500 - 9583 MechEffMap or 1413 MechEfficiencyConst) at the according
load point in the generator efficiency table until λ
cal
= λ
des
When λ
cal
> λ
des
then:
1b. Decrease η
set
(9500 - 9583 MechEffMap or 1413 MechEfficiencyConst) at the accord-
ing load point in the efficiency table (engine with generator) until λ
cal
= λ
des
2. Repeat this calibration for the other three load points, e.g., 80 %, 60 % and 40 % load.
3. When “Closed Loop” is active, the system switches automatically to “Open Loop” as
soon as output is inferior to e.g. 40 % (depending on 1400
ClosedLpPowerMinRate).
4. Increase load until rated output is reached. For all loadpoints λ
cal
= λ
des
= λ
mea
should
hold true.
5. Measured exhaust gas values should correspond to desired exhaust gas values for all
loads. Corrections must be made in the λ table.
6. If this is the case, the AFR control is now ready to be switched in Closed Loop opera-
tion (5400
ClosedOrOpenLoop).
E) Verification of the closed control circuit
1. Verify the adjustment of I-parameter for Closed Loop Control (1401 ClosedLoop-
Gov:I) and, if necessary, change the value to obtain the desired control characteristics
and stability. Observe that the speed of the AFR control is approx. 25 times slower
than the speed of the speed control circuit.
2.
Switch on Closed Loop Mode (5400 ClosedOrOpenLoop = 1).
3.
Mark the position of the adjustment spindle of the zero governor.
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