Delta VFD-BW Series, User Manual

Page: 203 / 251

Chapter 8 Maintenance and Inspections
|
VFD-BW Series
8-4 Revision May 2009, BWE0, SW V1.05
„ DC capacity of main circuit
Maintenance
Period
Check Items Methods and Criterion
Daily
Half
Year
One
Year
If there is any leak of liquid, color
change, crack or deformation
Visual inspection {
Measure static capacity when
required
Static capacity
≥
initial value X 0.85 {
„ Resistor of main circuit
Maintenance
Period
Check Items Methods and Criterion
Daily
Half
Year
One
Year
If there is any peculiar smell or
insulator cracks due to overheat
Visual inspection, smell {
If there is any disconnection
Visual inspection or measure with
multimeter after removing wiring
b1/+2 ~ -
Resistor value should be within
±
10%
{
„ Transformer and reactor of main circuit
Maintenance
Period
Check Items Methods and Criterion
Daily
Half
Year
One
Year
If there is any abnormal vibration
or peculiar smell
Visual, aural inspection and smell {
„ Magnetic contactor and relay of main circuit
Maintenance
Period
Check Items Methods and Criterion
Daily
Half
Year
One
Year
If there are any loose screws Visual and aural inspection {
Check to see if contacts work
correctly
Visual inspection
{