1. Introduction
This SOP provides a step-by-step guide to troubleshoot the LF fault in IMPULSE®️ Series 5 AC Variable Frequency Drives. The LF fault is generated if there’s a problem on the output T leads from the drive to the motor.
2. Procedure
2.1 Identify the LF Fault
The LF fault or output phase loss fault is triggered if the Impulse drive, while running, sense the loss of one of the three T leads between the drive output and the motor.
2.2 Handle the Fault Condition
If this fault condition occurs, the drive shuts off immediately, sets the holding brake or brakes, and records this in the fault trace and the fault history. This indicates that the drive has lost one of its three phases on the output.
2.3 Reset the Fault
Reset the fault without reconnecting one of the phases that were disconnected. At this point, there are only 2 legs coming out of the drive to the motor.
2.4 Give the Drive a Run Command
Give the drive a run command. The drive will continue to trip on an LF fault. This is a safety feature, guaranteeing that there is the proper amount of current flow to the motor that will safely control the load.
2.5 Ensure a Balanced 3 Phase on the Output
The drive will not run unless it has a balanced 3 phase on the output. This will have to be rectified before the drive will begin to go through its standard operation cycle.
3. Conclusion
This SOP provides a comprehensive guide to troubleshoot the LF fault in IMPULSE®️ Series 5 AC Variable Frequency Drives. Always ensure to follow the steps in order to prevent any mishaps or further complications.
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15 сен 2024
