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TROUBLESHOOTING
This section provides information on routine inspections and troubleshooting tips for potential
system problems.
WARNING: Risk of electric shock. De-energize the unit by disconnecting all incoming
sources of power, then wait 5 minutes for internal charges to dissipate before servicing
the equipment.
HIGH VOLTAGE: This equipment is connected to line voltages that can create a
potentially hazardous situation. Electric shock could result in serious injury or death.
This device should be installed and serviced only by trained, licensed and qualified
personnel. Follow instructions carefully and observe all warnings.
4.1 Routine Inspection and Maintenance
The unit should be inspected and cleaned at least annually or more frequently if it is in an
excessively warm or dusty environment. Annual inspections should include the following:
•
Ensure that the installation environment is free of excessive dirt or contaminants
Check that all enclosure openings are unobstructed
•
Visually inspect the interior of the enclosure for signs of excessive heat or arcing
•
on components and wires
•
Verify that all ground connections are tight
Retorque VFD and motor connections
•
4.2 Evaluating Output Filter Performance
Output filter performance can be evaluated by viewing the output voltage wave form with an
oscilloscope. Figure 1 shows a typical VFD output voltage waveform when measured line-
to-line.
Figure 5 – VFD Line-to-Line Output Voltage Waveform
Figure 2 shows a typical filter output voltage as measured line-to-line with an oscilloscope.
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