TM 9-6115-730-24
0007
TROUBLESHOOTING USING SP FAULT CODES - Continued
NOTE
SP3 and SP4 active during paralleling only.
SYMPTOM
3.
SP3
MALFUNCTION
Bus Frequency Fault (Paralleling Only)
When main contactor relay K1 is energized and one or both of the following is true for more than 2
is greater than 0.2 Hz. The difference in phase between the generator and the bus is greater than 10
degrees. The GSC will stop synchronization process until the fault is cleared and corrected.
CORRECTIVE ACTION
STEP 1.
Verify that no fault codes are listed on upper display.
STEP 2.
Verify equipment setup is correct per TM 9-6115-730-10.
STEP 3.
Verify equipment setup and parameters for synchronization (WP 0083, Table 6).
STEP 4.
Restart generator sets.
STEP 5.
Adjust and evaluate operation using synchronization lights per TM 9-6115-730-
10.
STEP 6.
Operate per TM 9-6115-730-10.
STEP 7.
Verify the problem has been resolved.
SYMPTOM
4.
SP4
MALFUNCTION
Bus Voltage Fault (Paralleling Only)
Input is active when 208 or 416 VAC is detected on the load bus by dead bus relay low sensor (DBLO)
or dead bus relay high sensor (DBHI). This input is compared to the reading of the bus. If the voltage
of phase A is less than 20% of the rated voltage, it is considered to be dead. If the condition of these
measurements is different with regards to presence or absence of bus voltage, a fault is announced.
CORRECTIVE ACTION
STEP 1.
Verify that no fault codes are listed on upper display.
STEP 2.
Verify equipment setup is correct TM 9-6115-730-10.
STEP 3.
Verify equipment setup and parameters for synchronization (WP 0083, Table 6).
STEP 4.
Restart generator sets.
STEP 5.
Adjust and evaluate operation using synchronization lights per TM 9-6115-730-
10.
0007-3
