Basler Electric DGC-2020 - Manual (Page 357)

Incorrect Measurement or Display of Generator Current
Step 1. Verify that all wiring is properly connected. Refer to Section 6, Installation, Connections.
Step 2. Ensure that the proper current is present at the DGC-2020 current sensing inputs 68/69, 71/72,
and 74/75.
Step 3. Verify that the current sensing transformer ratios are correct.
Step 4. Confirm that the current sensing transformers are correct and properly installed.
Incorrect Display of Engine RPM
Step 1. Verify that all wiring is properly connected. Refer to Section 6, Installation, Connections.
Step 2. Verify that the flywheel teeth setting is correct.
Step 3. Verify that the prime mover governor is operating properly.
Step 4. Verify that the measured frequency of the voltage at the MPU input (31 and 32) is correct.
Step 5. If the MPU is shared with the governor, verify that the polarity of the MPU input to the governor
matches the polarity of the MPU input to the DGC-2020.
DGC-2020 Indicates Incorrect Power Factor
Check the rotation of the machine and the labeling of the A-B-C terminals. The machine must be rotating
in clockwise (A-B-C) phase sequence for correct power factor metering. A power factor indication of 0.5
with resistive load present is a symptom of incorrect phase rotation.
LCD is Blank and all LEDs are Flashing at Approximately 2 Second Intervals
This indicates that the DGC-2020 does not detect that valid application firmware is installed. The unit is
running its boot loader program, waiting to accept a firmware upload.
Step 1. Start BESTCOMSPlus ®. Use the top pull-down menu and select FILE > NEW > DGC-2020.
Step 2. Select COMMUNICATIONS > UPLOAD DEVICE FILES and select the device package file that
contains the firmware and language you want to upload.
Step 3. Check the boxes for DGC-2020 Firmware and DGC-2020 Language Module. Click the
UPLOAD button to start the upload process.
Generator Breaker and Mains Breaker
Generator Breaker Will Not Close to a Dead Bus
Step 1: Review the description of how the generator breaker logic element functions contained in the
GENBRK logic element description in Section 5, BESTlogic ™ Plus Programmable Logic.
Step 2: Review the section on breaker close requests in Section 3, Functional Description, Breaker
Management.
Step 3: Navigate to the SETTINGS > BREAKER MANAGEMENT > BREAKER HARDWARE > GEN
BREAKER screen and set DEAD BUS CL ENBL to ENABLE.
Step 4: Verify that the Generator status is stable. The breaker will not close if the generator status is
not stable. Check status by using the Metering Explorer in BESTCOMSPlus
® and verify that
when the generator is running, the GEN STABLE status LED is lit. If necessary, modify the
settings on the SETTINGS > BREAKER MANAGEMENT > BUS CONDITION DETECTION
screen.
Step 5: Verify the bus status is DEAD. Check status by using the Metering Explorer in
BESTCOMSPlus
® and verify that when the generator is running, the BUS DEAD status LED is
lit. If necessary, modify the settings on the SETTINGS > BREAKER MANAGEMENT > BUS
CONDITION DETECTION screen.
Step 6: Verify the connections in BESTlogicPlus Programmable Logic to the generator breaker logic
element. The Status input must be driven by an “A” or normally open contact from the generator
breaker. The OPEN and CLOSE command inputs on the left side of the logic block are inputs
for open and close commands. These can be wired to physical inputs if it is desired to have
open and close command switches. If they are wired, they must either be pulsed inputs, or
some logic must be employed so that the open and close command inputs are never driven at
the same time. If these are both driven at the same time, the breaker is receiving open and
9400200990 Rev X DGC-2020 Maintenance and Troubleshooting 8-3