6-6 DECS-100 Maintenance and Troubleshooting 9287500991 Rev K
Step 2. Verify that the DECS-100 output (field) current limit is not set too low.
Adjust the field current limit as needed.
Step 3. Use the connection diagrams of Section 4,
Installation
to verify that the sensing voltage and
current connections to the DECS-100 provide the proper phasing.
Correct the sensing voltage and current connections as needed.
Step 4. Verify that the generator exciter field current requirements are compatible with the DECS-100.
If the generator exciter field current requirements are not compatible with the DECS-100,
contact Basler Electric Technical Sales Support for recommendations.
If the generator exciter field current requirements are compatible with the DECS-100, proceed
to Step 5.
Step 5. Replace the DECS-100.
If replacing the DECS-100 does not correct the malfunction, proceed to Step 6.
Step 6. Refer to the generator manual or contact the generator manufacturer.
Underfrequency Active Indicator is Annunciating
Step 1. Verify that the generator is operating at rated speed.
If the generator is not operating at rated speed, adjust the generator speed.
If the generator is operating at the rated speed, proceed to Step 2.
Step 2. Verify that the underfrequency setpoint is correct.
If the underfrequency setpoint is incorrect, adjust it to the correct value.
No Droop
Step 1. Verify that the DECS-100 52L/M contact input is open.
If the 52L/M contact input is not open, it must be opened to enable the droop function.
If the 52L/M contact input is open, proceed to Step 2.
Step 2. Verify that the DECS-100 52J/K contact input (if present) is closed or the Var/PF function is
disabled via BESTCOMS. Var/PF operation must be disabled for droop operation. If var/PF
operation is disabled, proceed to Step 3.
Step 3. Verify that the DECS-100 droop setting is not adjusted to 0% droop.
If the droop setting is adjusted to 0% droop, increase the setpoint above 0%.
If the droop setting is adjusted to above 0%, proceed to Step 4.
Step 4. Check for an open in the circuit connected to DECS-100 CT1 and CT2.
If there is an open circuit, repair as necessary.
If there is no open circuit, proceed to Step 5.
Step 5. Verify that all connections are correct according to Figures 4-6 through 4-9.
If connections are incorrect, correct the problem.
If connections are correct, proceed to Step 6.
Step 6. Verify that the load being applied to the generator for droop testing is not purely resistive.
If only a resistive load is being applied to the generator, apply an inductive load and retest.
If the load being applied to the generator is inductive, proceed to Step 7.
Step 7. Verify that your DECS-100 is compatible with the current sensing transformer (1 A or 5 A
secondary) being used. For example, a current sensing transformer with a 1 ampere output
rating would produce very little droop if your DECS-100 has a 5 ampere current transformer
input. Refer to Figure 1-1 to check the current transformer input of your DECS-100.
If the current transformer input is incorrect, replace the current sensing transformer or the
DECS-100 for compatibility.
If the current transformer input is correct, proceed to Step 8.
Step 8. If the above steps fail to correct the malfunction, replace the DECS-100 unit.
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