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DGC-2020HD Troubleshooting
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 the Breaker Management
chapter in the Configuration manual.
Step 3: Check for raise and/or lower pulses coming from the DGC-2020HD if the governor or AVR bias
control output type is contact.
Step 4: Check the governor and/or AVR bias analog outputs on the DGC-2020HD 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-2020HD 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 Explorer in BESTCOMSPlus® and verify that when the
generator is running, the Generator 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-2020HD is trying to initiate a breaker closure. To determine the sources of
breaker close requests, refer to the Breaker Management chapter in the Configuration manual.
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-2020HD 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-2020HD.
Synchronizer Does Not Lower Engine Speed Allowing Alignment of Bus and Generator
Navigate to the Settings, Programmable Outputs, Analog Output Settings, GOV Output screen and set
Speed Response to Decreasing.
Synchronizer Does Not Raise Engine Speed Allowing Alignment of Bus and Generator
Using the front panel HMI, navigate to the Settings > Programmable Outputs > Analog Output Settings >
GOV Output screen and change the Speed Response setting from Increasing to Decreasing.
Synchronizer Does Not Lower the Generator Voltage to Achieve Matching of Bus and
Generator Voltages
Navigate to the Settings, Programmable Outputs, Analog Output Settings, AVR Output screen and set
Voltage Response to Decreasing.
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