Basler Electric DECS-100 - Manual (Page 82)

6-4 DECS-100 Maintenance and Troubleshooting 9287500991 Rev M
If the governor is not operating properly, troubleshoot using the manufacturer's suggested
procedures.
If the governor is operating properly, proceed to Step 2.
Step 2. Verify that the sensing and input power leads are connected securely.
If the sensing or input power leads are not connected securely, tighten the connections.
If the sensing or input power lead connections are secure, proceed to Step 3.
Step 3. Verify that the DECS-100 Stability Range is set to the proper range.
If the Stability Range setting is incorrect, reset the Stability Range.
If the Stability Range setting is correct, proceed to Step 4.
Step 4. Verify that the Stability Level is properly set.
If the Stability Level is not properly set, reset the Stability Level.
Overexcitation Shutdown Indicator is Annunciating
Step 1. Check for generator overloading.
If the generator is operating with a larger than rated load, shed load.
If the generator is operating with a rated or less than rated load, proceed to Step 2.
Step 2. Verify that the generator exciter field voltage requirements are compatible with the DECS-100.
If the exciter field voltage requirements are not compatible with the DECS-100, contact Basler
Electric Customer Service for recommendations.
If the exciter field voltage requirements are compatible with the DECS-100, proceed to Step 3.
Step 3. Replace the DECS-100.
If replacing the DECS-100 does not correct the malfunction, proceed to Step 4.
Step 4. Refer to the generator manual. Generator is defective.
Loss of Generator Sensing Indicator is Annunciating
Step 1. Verify that the voltage sensing leads are properly connected.
If the sensing leads are not properly connected, correct the connections.
If the sensing lead connections are correct, proceed to Step 2.
Step 2. For single-phase sensing, verify that E2 and E3 are connected.
If E2 and E3 are not connected, connect them both to phase C sensing voltage.
If E2 and E3 are properly connected, proceed to Step 3.
Step 3. Verify that the sensing potential transformer (if used) has the correct turns ratio and is
functioning properly.
If the sensing potential transformer has the wrong turns ratio or is malfunctioning, replace it.
If the sensing potential transformer is correct and functioning properly, proceed to Step 4.
Step 4. Verify that the generator output voltage is present on all phases.
If the generator is missing a phase, refer to the generator manual. Generator is defective.
If generator output voltage is balanced on all phases, proceed to Step 5.
Step 5 Replace the DECS-100.
Overexcitation Limiting Indicator is Annunciating
Step 1. Check for generator overloading.
If the generator is operating with a larger than rated load, shed load.
If the generator is operating with a rated or less than rated load, proceed to Step 2.
Step 2. Verify that the DECS-100 output (field) current limit is not set too low.
If the output current limit setpoint is too low, adjust for the proper setting.
If the output current limit is set properly, proceed to Step 3.