Delta Electronics AC Motor Drive VFD007S23A - Manual (Page 151)

Chapter 8 Maintenance and Inspections|VFD-S Series
8-4 Revision August 2006, SE08, SW V2.61
DC capacity of main circuit
Maintenance
Period
Check Items Methods and Criterion
Daily
Half
Year
One
Year
If there is any leakage of liquid,
change of color, cracks 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
overheating
Visual inspection, smell
If there is any disconnection
Visual inspection or measure with
multimeter after removing wiring
between +1/+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. Tighten
screw if necessary.
Check to see if contacts work
correctly
Visual inspection