- Alarm Fault
- Resettable Shutdown Fault
- Non-Resettable Shutdown Fault
- Severe Fault
Alarm faults indicate a condition that will not inhibit the function of the digital voltage regulator and the generator set. Alarm faults have fault codes in the 600's range. A condition such as a partial internal memory failure is an alarm fault. The generator set continues to operate at a normal level. When an alarm fault occurs, the fault code will flash on the display of the digital voltage regulator. Pressing the function key toggles the display to show the parameter for the latest fault. The user can then investigate the various parameters of the digital voltage regulator through the keypad and display. All information that is shown on the display will be flashing. Alarm faults must be reset before another alarm fault can be declared. However, a successive shutdown fault will override an alarm fault, and move the alarm fault code to the previous fault location. In order to clear an alarm fault, see System Operation, "Parameters".
Resettable shutdown faults indicate a condition where the digital voltage regulator or the generator set exhibit a degradation of power generation performance. Resettable shutdown faults have fault codes in the 700's range. Conditions such as undervoltage and overvoltage are resettable shutdown faults. The generator set continues to operate, but at a reduced level too low to sustain load (excitation voltage of 3.0 VDC or less at F1 and F2). When a resettable shutdown fault occurs, the fault code will flash on the display of the digital voltage regulator. Pressing the function key toggles the display to show ":92", the parameter for the latest faults. The user can then investigate the various parameters of the digital voltage regulator through the keypad and display. All information that is shown on the display will be flashing. In order to reset a resettable shutdown fault, activate parameter :96 or the fault reset switch. See System Operation, "Customer Options". After the fault is reset, the display will stop flashing and return to parameter :01, but parameter :92 will still contain the fault code. The digital voltage regulator will immediately begin to regulate voltage again. In order to clear the fault code, use parameter :94.
Non-Resettable shutdown faults indicate a condition where the digital voltage regulator cannot be safely run. Non-resettable shutdown faults have fault codes in the 800's range. Conditions such as sensing loss and frequency loss are non-resettable shutdown faults. The generator set continues to operate, but at a reduced level too low to sustain load (excitation voltage of 3.0 VDC or less at F1 and F2). When a non-resettable shutdown fault occurs, the fault code will flash on the display of the digital voltage regulator. Pressing the function key toggles the display to show ":92", the parameter for the latest faults. The user can then investigate the various parameters of the digital voltage regulator through the keypad and display. All information that is shown on the display will be flashing. In order to reset a non-resettable shutdown fault, remove power from the digital voltage regulator (remove 24 VDC from "B+"/"B-" inputs).
Severe faults indicate the existence of a condition which would be dangerous if not harmful to run the digital voltage regulator. Severe faults have fault codes in the 900's range. An example of a severe fault is fault code 901 which indicates that the internal memory of the digital voltage regulator is not functioning properly. The memory contains parameter data that is read each time the digital voltage regulator is powered-up (24 VDC applied to "B+"/"B-" inputs). The parameters configure the digital voltage regulator to the specific generator set. When a severe fault occurs, the fault code will flash on the display of the digital voltage regulator. Also, the keypad will be disabled (the keys will have no effect on the digital voltage regulator and the external shutdown fault reset will have no effect on the digital voltage regulator). A severe fault cannot be reset. These faults occur at power-up or when writing a new value to EEPROM memory. Severe faults cause the digital voltage regulator to prohibit power generation. The digital voltage regulator must be replaced.