Warnings

Problem	Items to Check, Troubleshooting Steps, Remedies
ECU malfunction	The engine ECU has detected a warning alarm that has been read by the DSE controller. The exact error may or may not be displayed on the DSE controller. In this case it may be necessary to connect a diagnostic tool to the engine ECU.
ECU protect	The engine ECU has detected a warning alarm that has been read by the DSE controller. The exact error may or may not be displayed on the DSE controller. In this case it may be necessary to connect a diagnostic tool to the engine ECU.
Negative Phase Sequence	The ‘Negative Phase Sequence’ warning is triggered in the event that the DSE controller has detected a load imbalance on the generator output that has reached or exceeded the maximum threshold allowed. The load imbalance can cause negative sequence currents in the alternator stator windings. The maximum permissible imbalance of one phase current to another is setup as a percentage of total generator load current. Possible causes: Unbalanced single phase loads. Fault in one of the generator output lines. Possible remedies: Attempt to correct the imbalance by redistributing the single phase loads while monitoring the phase currents on the DSE controller until the load is better balanced more equally among the three phases.
Battery Under Voltage	The ‘Battery Under Voltage’ warning is triggered in the event that the DC supply to the DSE controllers has reached or fallen below the threshold for the allowed time limit. Possible causes: Discharged batteries (drained, not getting charged by engine alternator). One or more failed cells and / or batteries. Loose, corroded connections to the battery.
Short Circuit	The ‘Short Circuit’ warning is triggered during overload conditions caused by a short circuit on the generator output / bus. Possible causes: Line faults (e.g. single / multi line to ground, line to line) Excessively large load dumped on generator (e.g. large motor start attempts outside the capabilities of the generator). Inspect and test generator wiring and output connections for shorts, disconnect the load to help determine and isolate the cause of the problem i.e. if fault is on generator or on the load / load cables. Do not operate the generator if a short is measured or suspected - always wait until the generator is thoroughly inspected and repaired. Refer to the alternator manufacturer’s procedures for troubleshooting and testing the alternator components.

ECU malfunction

The engine ECU has detected a warning alarm that has been read by the DSE controller. The exact error may or may not be displayed on the DSE controller. In this case it may be necessary to connect a diagnostic tool to the engine ECU.

ECU protect

The engine ECU has detected a warning alarm that has been read by the DSE controller. The exact error may or may not be displayed on the DSE controller. In this case it may be necessary to connect a diagnostic tool to the engine ECU.

Negative Phase Sequence

The ‘Negative Phase Sequence’ warning is triggered in the event that the DSE controller has detected a load imbalance on the generator output that has reached or exceeded the maximum threshold allowed. The load imbalance can cause negative sequence currents in the alternator stator windings. The maximum permissible imbalance of one phase current to another is setup as a percentage of total generator load current.

Possible causes:

Unbalanced single phase loads.
Fault in one of the generator output lines.

Possible remedies:

Attempt to correct the imbalance by redistributing the single phase loads while monitoring the phase currents on the DSE controller until the load is better balanced more equally among the three phases.

Battery Under Voltage

The ‘Battery Under Voltage’ warning is triggered in the event that the DC supply to the DSE controllers has reached or fallen below the threshold for the allowed time limit.

Possible causes:

Discharged batteries (drained, not getting charged by engine alternator).
One or more failed cells and / or batteries.
Loose, corroded connections to the battery.

Short Circuit

The ‘Short Circuit’ warning is triggered during overload conditions caused by a short circuit on the generator output / bus.

Possible causes:

Line faults (e.g. single / multi line to ground, line to line)
Excessively large load dumped on generator (e.g. large motor start attempts outside the capabilities of the generator).

Inspect and test generator wiring and output connections for shorts, disconnect the load to help determine and isolate the cause of the problem i.e. if fault is on generator or on the load / load cables.

Do not operate the generator if a short is measured or suspected - always wait until the generator is thoroughly inspected and repaired. Refer to the alternator manufacturer’s procedures for troubleshooting and testing the alternator components.