Delta VFD-EL-W Series, User Manual

Page: 169 / 197

Chapter 6 Fault Code Information and Maintenance

VFD-EL-W
6-6
6.2 Maintenance and Inspections
Before the check-up, always turn off the AC input power for at least five minutes and remove the
cover. Even if the power has been turned off, a charge may still remain in the filter capacitors with
hazardous voltages before the power is OFF. Make sure the voltage is lower than 25 V
DC
before
you perform any inspections.
Ambient environment
Items to Check Methods and Criterion
Maintenance Period
Daily Half Year One Year
Check the ambient
temperature, humidity,
vibration and for any dust, gas,
oil or water drops.
Visual inspection and
measurement with equipment
with standard specifications

Check for any dangerous
objects in the environment.
Visual inspection 
Voltage
Items to Check Methods and Criterion
Maintenance Period
Daily Half Year One Year
Check if the voltages of
the main circuit and
control circuit are correct.
Measure with multi-meter with
standard specifications.

Digital keypad display
Items to Check Methods and Criterion
Maintenance Period
Daily Half Year One Year
Check that the display is
clear for reading.
Visual inspection 
Check for any missing
characters in the display.
Visual inspection 
Mechanical parts
Items to Check Methods and Criterion
Maintenance Period
Daily Half Year One Year
Check for any abnormal
sounds or vibrations.
Visual and auditory inspection 
Check for any loose
screws.
Tighten the screws 
Check for deformed or
damaged parts.
Visual inspection 
Check for any color
change due to
overheating.
Visual inspection 
Check for any dust or dirt. Visual inspection 