Basler Electric DGC-2020 - Manual (Page 360)

CLOSE outputs from the Gen Breaker Block in the programmable logic. Map a virtual switch to
the logic output that would normally be the breaker close output. Map another virtual switch to
the logic output that would normally be the breaker close output. Connect with
BESTCOMSPlus
®, and exercise the virtual switches using the Control panel located in the
Metering Explorer. Never turn open and close on at the same time. This could damage the
breaker and/or motor operator. If everything is working as expected, restore the logic to its
original diagram.
Mains Breaker Does Not Close After Mains Returns
Step 1: Verify that a Mains Breaker has been configured by examining the settings on the SETTINGS >
BREAKER MANAGEMENT > BREAKER HARDWARE screen.
Step 2: Verify the mains breaker has been correctly included in the programmable logic.
Step 3: Verify that the MAINS FAIL TRANSFER parameter is set to ENABLE on the SETTINGS >
BREAKER MANAGEMENT > BREAKER HARDWARE screen.
Step 4: Verify that stable mains power is detected by the DGC-2020. Check status using the Metering
Explorer in BESTCOMSPlus
® and verify that the MAINS STABLE status LED is lit when the
power on the DGC-2020 bus voltage input is good. If necessary, modify the settings on the
SETTINGS > BREAKER MANAGEMENT > BUS CONDITION DETECTION screen to achieve
correct detection.
Step 5: Verify the wiring to the breaker from the DGC-2020. If it seems OK, you can do a manual close
and open by modifying the programmable logic. Map some unused outputs to the OPEN and
CLOSE outputs from the Gen Breaker Block in the programmable logic. Map a virtual switch to
the logic output that would normally be the breaker close output. Map another virtual switch to
the logic output that would normally be the breaker close output. Connect with
BESTCOMSPlus
®, and exercise the virtual switches using the Control panel located in the
Metering Explorer. Never turn open and close on at the same time. This could damage the
breaker and/or motor operator. If everything is working as expected, restore the logic to its
original diagram.
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 Explorer 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.
8-6 DGC-2020 Maintenance and Troubleshooting 9400200990 Rev X