Woodward DSLC, Installation And Operation Manual, Page: 54 / 114

DSLC Digital Synchronizer and Load Control Manual 02007
48 Woodward
8. If generator voltage goes to a value greater than the bus voltage plus the
amount determined by the Voltage Window set point, indicated by the DSLC
Lower Voltage discrete output energizing the lower voltage relay, increase
the Voltage Window set point or set the MOP up for a slower rate of change
in voltage if cycling through the Voltage Window occurs.
9. Proceed to Final Voltage Matching Setup.
Voltage Matching with Voltage Bias Input to Voltage Regulator
1. Set the synchronizer mode switch to Off. Set the Voltage Range
potentiometer across the DSLC control output fully counterclockwise.
2. Set the Voltage Regulator manual voltage adjustment for the desired center
of generator voltage adjustment range (normally set for rated voltage).
3. Close the Raise Voltage contact input to the DSLC control. Observe that the
Voltage Raise Relay set point on Menu 9 indicates Energized when the
Raise Voltage contact input is closed. Hold the Raise Voltage command
until the Voltage Raise Relay set point indicates De-energized even with the
Raise Voltage contact closed. This indicates that the upper limit of the
Voltage Bias Output has been reached. If enabled, a Voltage Range Alarm
will also be activated.
4. Adjust the Voltage Range potentiometer to get the maximum generator
voltage desired.
5. Close the Lower Voltage contact input to the DSLC control. Observe the
Voltage Lower Relay set point on Menu 9 indicates Energized when the
Lower Voltage contact input is closed. While monitoring generator voltage to
insure it does not go lower than desired, hold the Lower Voltage command
until the Voltage Lower Relay set point indicates De-energized even with the
Lower Voltage contact closed. This indicates that the lower limit of the
Voltage Bias Output has been reached. If enabled, a Voltage Range Alarm
will also be activated. The voltage cannot be manually adjusted below the
voltage low limit set point.
6. If the minimum generator voltage obtained is satisfactory, proceed to step 7.
If not, adjust the voltage regulator voltage setting potentiometer and the
Voltage Range potentiometer while repeating steps 3 through 5 until the
desired voltage range is obtained.
7. Select Menu 7 and display Phase A Volts. Select the other screen on the
Hand Held Programmer by pressing the  “Up/Down Arrow” key. Select Menu
7 and display the Bus Voltage set point.
8. Use Voltage Raise or Lower to adjust the generator voltage until generator
Phase A voltage is approximately 5% higher than Bus Voltage plus the
Voltage Window.
9. Set the synchronizer mode switch to Check. The DSLC control should
decrease the Voltage Bias to the voltage regulator to lower the generator
voltage. The Voltage Bias should stop changing when Phase A voltage
enters the voltage window as determined by the Voltage Window set point.