Delta Electronics VFD-S manual „ DC capacity of main circuit

Chapter 8 Maintenance and InspectionsVFD-S Series
„ DC capacity of main circuit
			Maintenance
	Check Items	Methods and Criterion		Period
			Daily	Half	One
				Year	Year
	If there is any leakage of liquid,
	change of color, cracks or	Visual inspection	{
	deformation
	Measure static capacity when	Static capacity ≥ initial value X 0.85		{
	required
„ Resistor of main circuit
			Maintenance
	Check Items	Methods and Criterion		Period
			Daily	Half	One
				Year	Year
	If there is any peculiar smell or
	insulator cracks due to	Visual inspection, smell		{
	overheating
		Visual inspection or measure with
	If there is any disconnection	multimeter after removing wiring		{
		between +1/+2 ~ -
		Resistor value should be within ± 10%

„Transformer and reactor of main circuit

		Maintenance
Check Items	Methods and Criterion		Period
		Daily	Half	One
			Year	Year
If there is any abnormal vibration	Visual, aural inspection and smell		{
or peculiar smell

„Magnetic contactor and relay of main circuit

		Maintenance
Check Items	Methods and Criterion		Period
		Daily	Half	One
			Year	Year
If there are any loose screws	Visual and aural inspection. Tighten	{
	screw if necessary.
Check to see if contacts work	Visual inspection	{
correctly

8-4 Revision August 2008, SE09, SW V2.61