1335
UnclassifiedCooling
What This Code Means
Generator bus frequency is greater than the upper drop-out threshold or less than the lower drop-out threshold for longer than the drop-out time delay; At least one variable (Voltage, Current, kW, kVAR, kVA, Power Factor) is out of range in utility bus and/or generator bus analog measurements; Hardware Failure Warning active; EEPROM Write Failure Warning active; Unsuccessful attempt to save a trim; The Synchronizing System is not in Auto mode
Possible Causes
- •Utility frequency is varying continuously
- •Lower and upper generator bus frequency drop-out settings on the SYNC1320 master synchronizer do not create a sensible bandwidth
- •SYNC1320 master synchronizer is measuring frequency incorrectly
- •Genset control is incorrectly calibrated
- •Meter calibration is incorrect
- •SYNC1320 master synchronizer VT and CT ratios are incorrectly set
- •VT and CT rated values do not match the ones set in the SYNC1320 master synchronizer
- •Built-in CTs do not comply with requirements regarding 5A-secondary and 1A-secondary (incorrect number of turns)
- •CT and VT polarities and connections are incorrect
- •Calibration Checksum Warning (Fault Code 2416) is active
- •EEPROM Write Failure Warning (Fault Code 353) is active
- •Utility Bus AC Metering Failure (Fault Code 1335) is active
- •Generator Bus AC Metering Failure (Fault Code 1335) is active
- •The hardware version is not compatible with the software version
- •The current value in RAM memory (to-be-written value) does not match its post-written value in EEPROM
- •Attempt to save a trim by using either InPower or the LCD display is not successful
- •The SYNC1320 master synchronizer fails to automatically save data on a periodic basis
- •Misoperation of relevant terminal blocks (TB10-6) on the SYNC1320 master synchronizer and related switches
- •Faulty cabling from the switches to the terminal blocks
- •Control switch operation is not OK
Suggested Actions
- 1Verify that the genset control is correctly calibrated
- 2Verify that the lower and upper generator bus frequency drop-out settings on the SYNC1320 master synchronizer create a sensible bandwidth that makes load-feeding a safe activity (InPower can be used to accomplish this)
- 3Make sure the Utility frequency is not varying a lot all of the time to avoid lengthy synchronizing operation
- 4Verify that the SYNC1320 master synchronizer is measuring frequency correctly
- 5Use InPower to determine if the generator bus or the utility bus is the source of the problem
- 6Verify that the meter calibration is correct
- 7Verify that the SYNC1320 master synchronizer VT and CT ratios are correctly set
- 8Verify that the VT and CT rated values match the ones set in the SYNC1320 master synchronizer
- 9Check the number of turns on each of the built-in CTs to verify that they comply with requirements regarding 5A-secondary and 1A-secondary
- 10Verify that the CT and VT polarities and connections are correct
- 11Identify which of the faults is active by observing the fault displayed on the control panel or observing the lamps on the SYNC1320 control board, or by using InPower
- 12Take corrective steps for the active specific faults
- 13Cycle power to the SYNC1320 master synchronizer
- 14If the problem continues, replace the control board
- 15Clear the fault by cycling power to the SYNC1320 master synchronizer
- 16Clear the fault by resetting the processor via an InPower initial calibration
- 17Verify if working in non-Auto mode is intentional
- 18Check relevant terminal blocks (TB10-6) on the SYNC1320 master synchronizer and related switches for misoperation
- 19Check cabling from the switches to the terminal blocks
- 20Make sure the control switch operation is OK
ASK RUDY ABOUT THIS FAULT
Get a diagnosis walkthrough for 1335 on your specific Cummins unit — cited to the OEM manual, not a forum guess.
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