Basler Electric DGC-2020HD - Manual (Page 302)

292 9469300990 Rev B
Maintenance and Troubleshooting DGC-2020HD
Step 8: Verify the wiring to the breaker from the DGC-2020HD. If it appears correct, you can manually
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 open 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.
Generator Breaker Does Not Open When It Should
Step 1: Review the description of how the generator breaker logic element functions contained in the
GENBRK logic element description in the BESTlogicPlus chapter.
Step 2: Review the section on breaker operation requests in the Breaker Management chapter.
Step 3: 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 close
commands simultaneously. The breaker will not change state if it is being commanded to open
and close at the same time.
Step 4: Verify the breaker is receiving an open command. Breaker open command sources are:

The DGC-2020HD itself when the automatic transfer (ATS) feature is enabled.

The DGC-2020HD itself when the Run with Load logic element receives a Stop pulse in the
programmable logic.

The DGC-2020HD itself when shutting down the engine due to an active alarm.

The DGC-2020HD itself when ending a run session from the Exercise Timer and the Run
with Load box is checked in the Generator Exerciser settings.

Manual Breaker Open Input Contacts applied to the Open and Close inputs on the left side
of the Generator Breaker logic element in the programmable logic.
Step 5: Verify the wiring to the breaker from the DGC-2020HD. If it appears correct, you can manually
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 open 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 Open When Mains Fails
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 Enabled on the Settings, Breaker
Management, Breaker Hardware screen.
Step 4: Verify that a failure of the mains is detected by the DGC-2020HD. Check status using the
Metering Explorer in BESTCOMSPlus and verify that the Mains Failed status LED is lit when
the power on the DGC-2020HD bus voltage input is either out of voltage or frequency range. If