Toshiba HV6AS instruction manual Check Points for Inspection cont’d, Page, Maintenance

Page 28 MAINTENANCE

Table 2. Check Points for Inspection (cont’d)

Check Point	Check Item	Check Method	Criteria	What to do
Auxiliary	Terminals loose	Visual	Make sure terminals are	Repair if
Switch	or disconnected	inspection.	not loose or disconnected.	disconnected.
		Tighten using a		Tighten if loose.
		screwdriver.		See Table 1 for
				tightening torques.
	Case/contacts	Visual	Make sure there is no	Replace if damaged
		inspection.	damage or warping.	or warped.
Control	Smooth	Energize the	Breaker (motor-operated	If the circuit fails to
Circuits	movement of	control circuit.	type) should charge	operate, check the
	motor charging		quickly and smoothly.	cause and repair.
	mechanism
	Terminals loose	Visual	Make sure terminals are	Repair if
	or disconnected	inspection.	not loose or disconnected.	disconnected.
		Tighten using a		Tighten if loose.
		screwdriver.		See Table 1 for
				tightening torques.
Insulation	Meaure main	Megger test at	Resistance should be	If the insulation
Resistance	circuit to ground	1000V.	500MΩ or greater.	resistance is low,
Measure-				wipe off the vacuum
ment				interrupter and other
				insulation surfaces
	Meaure	Megger test at	Resistance should be	with a clean dry
	between main	1000V.	100MΩ or greater.	cloth and then
	circuit terminals			repeat the test.
	Meaure control	Megger test at	Resistance should be
	circuits to	500V.	2MΩ or greater.
	ground