4 Troubleshooting
Error Condition
Incomplete
Sequence
External Trip
Troubleshooting | Guide |
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Main Cause |
| Remedy | |
Indicates the | 1 . | If the unit trips one second after start, verify that | |
detect current one second after a start |
| current transformer secondary input is present in the | |
command, or it detects current one |
| range of 100 mVAC to 3.54 VAC at terminals 1, 2, | |
second after a stop command. |
| and 3 with reference to 4. Verify that the coil voltage | |
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| is 115 VAC at terminals 14, 15, or 16 with reference | |
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| to 13 | when the motor is started. Verify 115 VAC at |
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| terminal 7 with reference to 13. Correct conditions if | |
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| necessary. Call Siemens if unit continues to trip. | |
| 2 . If the unit trips one second after a stop command, | ||
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| verify the contactor is open. Repair or replace the | |
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| contactor if it is not functioning properly. | |
| 3 . Verify | operation of mechanical interlock, and replace | |
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| or adjust. | |
| 4 . Verify absence of voltage at terminals 1, 2, and 3 with | ||
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| reference to 4, and at terminals 14, 15, or 16 with | |
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| reference to 13. If voltage is present, define the | |
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| source and reconnect so that the motor current only | |
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| passes through the current transformer. | |
| 5 . To disable incomplete sequence, select F1 on the | ||
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| HHC, press the ENTER key for one or more seconds | |
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| and start the motor. The incomplete sequence will | |
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| remain disabled until the above procedure is | |
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| repeated. | |
If the external trip LED is solidly | 1 . | Jam conditions such as a blocked conveyor belt or | |
illuminated and the motor is stopped, it |
| gear train cause a sudden increase in motor current, | |
indicates a jam or loss of load |
| which can damage the motor’s insulation in a short | |
condition, or a trip caused by an |
| period of time. | |
overtemperature indication from an |
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RTD. | 2 . | Loss of load conditions, such as a broken blade of an | |
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| impeller or loss of back pressure of a pump, result in | |
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| a sudden decrease in motor current. | |
| 3 . RTD | trip indicates that the stator temperature or the | |
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| temperature of one of the bearings has exceeded its | |
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| threshold. | |
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| RTD stator trip indicates either that the motor cooling | |
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| system is blocked, or that the fan is broken. | |
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| RTD bearing trip indicates overheating of the motor or | |
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| load | bearings. |
In any case, the motor should not be restarted until the cause of the overheating has been corrected.
4 . F16 on the HHC displays the external trip current at the time of the trip, or the RTD number which caused the trip.
In any case, determine the reason for the external trip and correct the problem before restarting the motor. If the external trip LED flashes and the motor continues to run, it indicates loss of load warning or process current warning.
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