Winco DGC-2020 - Manual (Page 217)

9400200990 Rev K DGC-2020 Maintenance and Troubleshooting 7-5
Synchronizer
Determining if the Synchronizer is Active
Step 1: Disable the speed trim function.
Step 2: Initiate a breaker close request by one of the methods listed in Section 3, Functional
Description, Breaker Management.
Step 3: Check for raise and/or lower pulses coming from the DGC-2020 if the governor or AVR bias
control output type is contact.
Step 4: Check the governor and/or AVR bias analog outputs on the load share module with a volt meter
if the governor or AVR bias control output type is analog.
Step 5: The voltages or raise/lower pulses should be changing when the synchronizer is active. If there
are no raise/lower pulses, or if the analog bias voltages do not change, the synchronizer is not
active.
Synchronizer Not Active
Step 1: Check style number to verify that the DGC-2020 has the synchronizer option. If the
synchronizer option does not exist in the style number, you may contact Basler Electric and
request a style number change.
Step 2: Check status using the Metering Exploring in BESTCOMSPlus and verify that when the
generator is running, the GEN STABLE status LED is lit and the BUS STABLE LED is lit. Adjust
the Bus Condition Detection settings accordingly. The synchronizer will never activate if the Bus
is Dead or Failed (i.e. not stable).
Step 3: Check that the DGC-2020 is trying to initiate a breaker closure. To determine the sources of
breaker close requests, refer to Section 3, Functional Description, Breaker Management.
Synchronizer Active for a Short Time, Then Stops
Step 1: Check if a Sync Fail pre-alarm or a Breaker Close Fail pre-alarm is occurring or has occurred.
The synchronizer stops acting when such a pre-alarm occurs. Press the Off button or the Reset
button on the DGC-2020 front panel to clear these pre-alarms.
Step 2: Verify that the Sync Fail Activation delay is sufficiently long to allow the synchronizer to
complete the synchronization process.
Step 3: Verify that the Breaker Close Wait time is not too short causing a pre-alarm to occur before the
breaker closes when a breaker close is initiated by the DGC-2020.
Synchronizer Does Not Lower Engine Speed Allowing Alignment of Bus and Generator
Step 1: Navigate to the SETTINGS->MULTIGEN MANAGEMENT->GOV ANALOG OUTPUT screen
and set SPD RESPONSE to DECREASING.
Synchronizer Does Not Raise Engine Speed Allowing Alignment of Bus and Generator
Step 1: Using the front panel HMI, navigate to the SETTINGS->MULTIGEN MANAGEMENT->GOV
ANALOG OUTPUT screen and set SPD RESPONSE to DECREASING.
Synchronizer Does Not Lower the Generator Voltage to Achieve Matching of Bus and Generator Voltages
Step 1: Navigate to the SETTINGS->MULTIGEN MANAGEMENT->AVR ANALOG OUTPUT screen
and set VOLT RESPONSE to DECREASING.
Synchronizer Does Not Reduce Generator Voltage to Achieve Matching of Bus and Generator Voltages
Step 1: Navigate to the SETTINGS->MULTIGEN MANAGEMENT->AVR ANALOG OUTPUT screen
and set VOLT RESPONSE to DECREASING.
Speed Bias
Engine Speed Does Not Change When Speed Bias Voltage Changes
Step 1: Verify that the engine speed will change when the speed bias changes. As a test, you can force
a voltage on the speed bias output by setting the Min Output Voltage and Max Output Voltage
to the same value by navigating to SETTINGS->MULTIGEN MANAGEMENT->GOV ANALOG
OUPUT. If the bias is current based, you can force a fixed current by setting the Governor
Output Voltage Minimum and Maximum to the same value by navigating to SETTINGS-
>MULTIGEN MANAGEMENT->GOV ANALOG OUTPUT.