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Troubleshooting DECS-150
Step 3. Use the connection diagrams of the Typical Connections section to verify that the sensing voltage
and current connections to the DECS-150 provide the proper phasing.
Correct the sensing voltage and current connections as needed.
Step 4. Verify that the machine exciter field current requirements are compatible with the DECS-150.
If the machine exciter field current requirements are not compatible with the DECS-150, contact
Basler Electric Technical Sales Support for recommendations.
If the machine exciter field current requirements are compatible with the DECS-150, proceed to
Step 5.
Step 5. Replace the DECS-150.
If replacing the DECS-150 does not correct the malfunction, proceed to Step 6.
Step 6. Refer to the machine manual or contact the machine manufacturer.
Underfrequency Active Indicator is Annunciating
Step 1. Verify that the machine is operating at rated speed.
If the machine is not operating at rated speed, adjust the machine speed.
If the machine 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-150 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-150 52J/K contact input (if present) is closed or the Var/PF function is
disabled via BESTCOMSPlus. 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-150 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-150 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. Refer to the Typical Connections section.
If connections are incorrect, correct the problem.
If connections are correct, proceed to Step 6.
Step 6. Verify that droop is not disabled through BESTlogicPlus.
Step 7. Verify that the load 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 to the generator is inductive, proceed to Step 8.
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