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Manual 02007 DSLC Digital Synchronizer and Load Control
Woodward 47
Voltage Matching Adjustment
Do the following steps to verify correct operation of the synchronizer voltage
matching function. Two procedures are given. The first is for systems where
voltage adjustment is done with a MOP, and the Voltage Raise and Voltage
Lower discrete outputs of the DSLC control are used to drive relays that operate
the MOP. The second adjustment procedure is for systems using the direct
Voltage Bias Output from the DSLC control directly connected to the voltage
regulator.
Preliminary Voltage Matching Setup
1. Select Menu 1 and set the Voltage Matching set point to Enabled.
2. Select Menu 4 and set the Voltage High Limit 5% higher than the final
expected value. Set the Voltage Low Limit 5% lower than the final expected
value.
Voltage Matching with MOP Driven Voltage Regulator
1. Set the synchronizer mode switch to Off. Set the Voltage Ramp set point on
Menu 4 to a value 10% greater than the time required to slew the voltage
regulator MOP through its full range.
2. 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.
3. 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.
4. Set the synchronizer mode switch to Check. The DSLC Lower Voltage
discrete output should energize the lower voltage relay to drive the voltage
regulator MOP in the decrease voltage direction. The Lower Voltage
discrete output should de-energize the lower voltage relay when Phase A
voltage enters the voltage window as determined by the Voltage Window
set point.
5. If generator voltage drops to a value less than the bus voltage, indicated by
the DSLC Raise Voltage discrete output energizing the raise voltage relay,
increase the Voltage Window set point or set the MOP up for a slower rate
of change in voltage if cycling occurs.
6. Set the synchronizer mode switch to Off. Manually lower the generator
voltage until generator Phase A voltage is approximately 5% lower than Bus
Voltage.
7. Set the synchronizer mode switch to Check. The DSLC Raise Voltage
discrete output should energize the raise voltage relay to drive the voltage
regulator MOP in the increase voltage direction. The Raise Voltage discrete
output should de-energize the raise voltage relay when Phase A voltage
reaches Bus Voltage.