9492600990 27-5
DECS-150 Troubleshooting
If replacing the DECS-150 does not correct the malfunction, proceed to Step 4.
Step 4. Refer to the machine manual. Machine is defective.
Loss of Machine 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 E1 and E3 are connected.
If E1 and E3 are not connected, connect them as required.
If E1 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 machine output voltage is present on all phases.
If the machine is missing a phase, refer to the machine manual. Machine is defective.
If machine output voltage is balanced on all phases, proceed to Step 5.
Step 5. Replace the DECS-150.
Overexcitation Limiting Indicator is Annunciating
Step 1. Check for machine overloading.
If the machine is operating with a larger than rated load, shed load.
If the machine is operating with a rated or less than rated load, proceed to Step 2.
Step 2. Verify that the DECS-150 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.
Step 3. 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 Customer Service for recommendations.
If the machine exciter field current requirements are compatible with the DECS-150, proceed to
Step 4.
Step 4. Replace the DECS-150.
If replacing the DECS-150 does not correct the malfunction, proceed to Step 5.
Step 5. Refer to the machine manual. Machine is defective.
Underexcitation Limiting Indicator is Annunciating
Step 1. Verify that the DECS-150 Machine Voltage setpoint is not being driven to a lower level.
The setpoint can be affected by the Raise/Lower contact inputs or by the Auxiliary input.
Step 2. Verify that the DECS-150 output (field) current limit is not set too low.
Adjust the field current limit as needed.
To Next Page
Loading...
Need help?
General
