DSLC Digital Synchronizer and Load Control
Manual 02007
88
Woodward
Apply 24 Vdc power to terminals 19 (
) and 20 (+). Connect the resistor from the
+24 Vdc source to the Breaker Close terminal 21. Connect the dc voltmeter to
terminal 19 (–) and terminal 21 (+). The meter should in24 Vdc. Select
Breaker Close Relay on Menu 9. Press either “Rabbit Up” or “Turtle Up” key. The
output should energize for approximately one second as indicated by a 0 Vdc
indication on the test meter.
Move the resistor and meter connection from terminal 21 and connect to Breaker
Open terminal 22. The meter should indicate 0 Vdc (normally energized). Select
the Breaker Open Relay set point on Menu 9. Press either “Rabbit Up” or “Turtle
Up” key. The output should de-energize for approximately one second as
indicated by a +24 Vdc indication on the test meter.
Repeat the above test procedure for each of the relay driver outputs and
corresponding Menu 9 selection.
Generator Potential Inputs
This section tests the operation and calibrates the Generator Potential Inputs.
Calibration of the input must be done for the appropriate voltage used in service.
Select Menu 5 and set Configuration Key to 49. Then set the PT Winding Ratio
to 1:1. Verify the System Frequency set point is 50 or 60 Hertz as appropriate.
Set the PT voltage input set point to 240 Vac or 120 Vac according to the DSLC
being tested. Set to 120 Vac for 120 V open delta DSLC versions. Set to 240 Vac
for 240 V open delta DSLC versions. Connect the generator potential inputs
according to the plant wiring diagram (Figure 1-3). The actual potential is not
important, but should be within 20% of the nominal input voltage (120 Vac or 240
Vac). Connect an ac voltmeter in parallel with the A phase (A phase to neutral for
wye DSLC versions or A phase to B phase for open delta DSLC versions).
Select Menu 6 and set the Calibration Key to 49. Select PT Phase A set point,
also on Menu 6. Adjust the set point to read the same as the calibration meter ±
0.1%.
Repeat the above procedure for the PT Phase B and PT Phase C generator
potential inputs.
NOTE: For open delta PTs, use:
φ
A = A to B
φ
B = B to C
φ
C = C to A
Restore the PT Winding Ratio, System Frequency, and PT Voltage Input set
points to their previous values.
Generator Current Inputs
This section tests and calibrates the Generator Current Transformer (CT) inputs.
Select Menu 5 and set Configuration Key to 49. Then set the CT Rating to 5:5.
Connect a 0-5 ampere current source to the Generator A Phase CT input at
terminals 13 and 14. A resistive load that consumes approximately 5 A at
nominal line voltage may be used in series with line voltage to provide the
current source. Actual current is not critical, but should be between 4 and 6 A for
best results. Connect a current meter in series with the current source.