Woodward DSLC, Installation And Operation Manual, Page: 56 / 114

DSLC Digital Synchronizer and Load Control Manual 02007
50 Woodward
1. Select Menu 2 and set Load Control Mode to Proportional.
2. Set Load Control Filter to 1.0 Hz.
3. Verify the Rated Load set point is set to the generator kW rating.
4. Set Base Load to 50% of Rated Load.
5. Set Unload Trip to 10% of Rated Load.
6. If the Load Droop setup procedure described above has not been done, do
the Load Control Droop Adjustment before proceeding.
7. Set Loadshare Gain to 0.72.
8. Set Frequency Trimmer to Disabled.
9. Set Load Time and Unload Time as desired. If times faster than 20 seconds
will be required in normal service, use 20 seconds during the following setup
procedures to allow time to react if the control fails to operate as expected.
Faster load and unload times may be specified after setup is complete.
10. Set Raise Rate and Lower Rate as desired. During setup, 1.0% per second
or slower is recommended.
11. Set High Limit PU to Rated Load and Low Limit PU to 0.0 during setup.
Proportional Base Load Control Setup
Proportional control should be used when paralleling with a frequency stable bus,
or when the process control will be used. The following procedure is used to set
up the proportional base load control mode. A utility bus or an isolated bus with
sufficient capacity is required to do this setup.
1. Set the Load Control Gain to 0.25.
2. Carefully set engine speed to get synchronous speed as indicated by little or
no drift on the synchroscope. Proportional load control is sensitive to
variations in bus frequency and engine speed setting.
3. Close the Base Load switch contact. Open the Load/Unload and Process
contacts. Close the isoch/droop switch and be sure the connection to the
CB Aux contact input, terminal 47, is connected so that the DSLC control
will receive the closure indication.
4. Select the synchronizer run mode to parallel the generator with the bus.
5. Verify that the generator is carrying the 10% of rated kW load specified by
the Unload Trip set point. Load may not be exactly the specified level, but
should be close depending on the accuracy at which engine speed and bus
frequency are matched.
NOTE
If load instability is observed, it may be necessary to adjust the dynamic
settings of the engine governor to get stability.