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Troubleshooting DECS-150
If the applied voltage is less than 6 Vac, refer to the machine manual and flash the machine
field.
If the applied voltage is 6 Vac or greater, proceed to Step 4.
Step 4: Verify that no fuses are open.
Replace any open fuses.
If no fuses are open, proceed to Step 5.
Step 5. Verify that the machine is not shut down through BESTlogicPlus.
Step 6. Verify that the front panel Overexcitation indicator is not lit.
If the front panel Overexcitation indicator (field voltage) is lit, check the machine and/or load
conditions. Interrupt input power or shut down the machine for a minimum of one minute.
If the front panel Overexcitation indicator is not lit, proceed to Step 7.
Step 7. Verify that the front panel Overexcitation Limiting indicator is not lit.
If the front panel Overexcitation Limiting indicator is lit, check the machine and load conditions.
Also check the Field Current Limit setpoint for the correct level. Interrupt input power or shut
down the machine for a minimum of 1 minute.
If the front panel Overexcitation Limiting indicator is not lit, proceed to Step 8.
Step 8. Verify that the DECS-150 soft start settings are correct. Too long of a soft start setting may give
the appearance of no buildup.
If the soft start settings are incorrect, adjust the settings.
If the soft start settings have no effect, proceed to Step 9.
Step 9. Replace the DECS-150 unit.
If replacing the DECS-150 unit does not correct the malfunction, then the machine is defective.
Consult with the machine manufacturer.
Low Machine Output Voltage
Step 1. Verify that the voltage adjustment is not set too low.
If the voltage adjustment is too low, adjust it to the correct setpoint.
If the voltage adjustment is correct, proceed to Step 2.
Step 2. Verify that the Underfrequency Knee setpoint is not greater than the machine frequency.
If the Underfrequency setpoint is too high, adjust the setpoint below the rated machine
frequency.
If the Underfrequency setpoint is correct, proceed to Step 3.
Step 3. Verify that the machine is spinning at rated speed.
If the machine is not up to rated speed, increase the machine speed to the rated level.
If the machine is spinning at rated speed, proceed to Step 4.
Step 4. For PMG power, check for correct input power to the DECS-150. Refer to the Specifications
section for input power requirements.
If the DECS-150 input voltage is low, refer to the PMG manual for PMG repair (PMG system
only).
If the voltage is at the required level, proceed to Step 5.
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