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DKG-707 User Manual
V-01-29 (07.10.2011)
9.5. Droop operation
Droop operation allows load sharing between gensets even if datalink communication fails. However
droop parameters should be adjusted properly for effective load sharing. Droop mode is able to
perform both active and reactive load sharing.
The governor droop is used for active load sharing. In order to activate this mode:
1. Enable governor droop
2. Adjust governor set point_1 (Rest point of Governor output at 0% load - P_A06).
3. Adjust governor set point_2 (Rest point of Governor output at 100% load - P_A07).
Set point_1 and Set point_2 can be determined in manual Governor and AVR control mode. (See
chapter 5.4 for details). Set point_1 is the rest point of the governor control output at 0% total system
active power. Set Point_2 is the rest point of the governor control output at 100% total system active
power. The engine speed at set point_2 should be at least 5 % less than the engine speed at set
point_1. More droop will give more stable operation.
It is advised to adjust the set point_1 speed 3% above nominal speed and set point_2 speed 3% below
nominal speed. Thus nominal speed will be reached at 50% load.
Below is a procedure for adjusting governor droop:
1) Set MANUAL mode and run the engine by pressing RUN (I) button
2) Get in the manual GOV and AVR command mode by pressing together MENU- and MENU+
3) Adjust GOV output in order to adjust engine speed 3% higher than the nominal speed. Note
this GOV control percentage as GOV_Setpoint_1.
4) Adjust GOV output in order to adjust engine speed 3% lower than the nominal speed. Note this
GOV control percentage as GOV_Setpoint_2.
5) Stop engine, get in the programming mode and adjust P_A06=GOV_Setpoint_1 and
P_A07=GOV_Setpoint_2.
AVR droop is used for reactive load sharing. In order to activate this mode:
1. Enable AVR droop
2. Adjust AVR set point_1 (Rest point of AVR output at 100% inductive load -P_A13).
3. Adjust AVR set point_2 (Rest point of AVR output at 100% capacitive load -P_A14).
Set point_1 and Set point_2 can be determined in manual Governor and AVR control mode. (See
chapter 5.4 for details). Set point_1 is the rest point of the AVR control output at 100% positive total
system reactive power, Set Point_2 is the rest point of the AVR control output at 100% negative total
system reactive power.
It is advised to adjust the set point_1 voltage 5% below nominal voltage and set point_2 voltage 5%
above nominal voltage. Thus nominal voltage will be reached at resistive loads.
Below is a procedure for adjusting AVR droop:
1) Set MANUAL mode and run the engine by pressing RUN (I) button
2) Get in the manual GOV and AVR command mode by pressing together MENU- and MENU+
3) Adjust AVR output in order to adjust the alternator voltage 5% lower than the nominal voltage.
Note this AVR control percentage as AVR_Setpoint_1.
4) Adjust AVR output in order to adjust the alternator voltage 5% higher than the nominal voltage.
Note this AVR control percentage as AVR_Setpoint_2.
5) Stop engine, get in the programming mode and adjust P_A13=AVR_Setpoint_1 and
P_A14=AVR_Setpoint_2.
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