Delta VFD-EL-W Series, User Manual

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Chapter 6 Fault Code Information and Maintenance

VFD-EL-W
6-8
Main circuit resistor
Items to Check Methods and Criterion
Maintenance Period
Daily Half Year One Year
Check for any peculiar odors or
insulation cracking due to
overheating.
Visual inspection, smell. 
Check for any disconnections. Visual inspection 
Check for damaged connections
Measure the resistor value with a
multi-meter

Main circuit transformer and reactor
Items to Check Methods and Criterion
Maintenance Period
Daily Half Year One Year
Check for any abnormal vibrations
or peculiar odors. Visual, auditory inspection and
smell.

Main circuit electromagnetic contactor and relay
Items to Check Methods and Criterion
Maintenance Period
Daily Half Year One Year
Check for any vibration sounds. Auditory inspection. 
Check that the contact works
correctly.
Visual inspection 
Main circuit printed circuit board and connector
Items to Check Methods and Criterion
Maintenance Period
Daily Half Year One Year
Check for any loose screws
and connectors.
Tighten the screws. 
Check for any peculiar odors or
color changes.
Visual inspection and smell 
Check for any cracking,
damage, deformation or
corrosion.
Visual inspection

Check for any leakage of liquid
or deformation in the
capacitors.
Visual inspection 
Cooling system cooling fan
Items to Check Methods and Criterion
Maintenance Period
Daily Half Year One Year
Check for any abnormal
sounds or vibrations.
Visual, auditory inspection and turn
the fan by hand (turn off the power
first) to check for smooth rotation.

Check for any loose screws. Tighten the screws.

Check for any color change
due to overheating.
Change fan. 