Toshiba VF-AS1 instruction manual Grounding capacitor switching method

! E6581301!

1.3.3 Grounding capacitor switching method

The inverter is grounded through a capacitor. The leakage current from the inverter can be reduced using the selector switch, switching bar or switching screw (depending on the model). This switching device is used to detach the capacitor from the grounding circuit or to reduce its capacitance.

Some models have capacitors that can be detached completely, while others have capacitances that can be reduced. Note 1:Without the capacitor, the inverter does not comply with the EMC directive.

■ 200V/45kW - 400V/75kW models and smaller: Grounding capacitor switch

1

	Warning
	!When attaching or detaching the capacitor, be sure to turn off power.
	!When the grounding capacitor is detached from the inverter with a capacity of 400V-3.7kW or
	less, be sure to set the carrier frequency (￿￿) to 4kHz or less.
Prohibited	If the carrier frequency is set above 4kHz, the inverter may overheat and become damaged.
	!When the grounding capacitor is detached from the inverter and the cables connecting the
	inverter to the motor are 100 m or more in length with a capacity between 400V-5.5kW and
	400V-18.5kW, be sure to set the carrier frequency (￿￿) to 4kHz or less.
	If the carrier frequency is set above 4kHz, the inverter may overheat and become damaged.
	!When installing or operating the inverter within an ungrounded system or within a
	high-resistance grounding system, set the grounding capacitor switch to Small.
	Any other setting may result in a system malfunction or overheating.

200V! 0.4kW#15kW

400V" 0.75kW#18.5kW￿

*1

200V 0.4kW~7.5kW, 18.5kW, 22kW

400V 0.75kW~18.5kW

To connect to the ground, push in.

(Factory default position)

*3

*3

To disconnect fom the ground, pull up.

*1: Refer to Section 1.3.1 for the

position of the switch.

200V! 18.5kW#45kW

400V" 22kW#75kW￿

￿

*2: Refer to next pages for the

position of the switch.

*3: For 400V-3.7kW model and less, the switch is fixed with a label saying “CF/SFr￿￿ 4kHz.” If such a label is affixed to your inverter, you should set the carrier frequency (￿￿) at 4kHz or less according to the instructions when switching.

200V 11kW, 15kW, 30kW~45kW

400V 22kW~75kW

Large Small

To change the capacitance to Large,

push in.

(Factory default position)

Large Small

To change the capacitance to Small,

pull up.

A-12