Toshiba TOSVERT VF-AS3 Instruction Manual page 79

8) Frame size A8
VFAS3-4200KPC to 4280KPC
2. 3. 4 Switching of grounding capacitor
• When using this 480V class inverter with a power supply system that is grounded in other than
the neutral point (e.g. when the power supply has delta connection with single phase
grounding), the grounding capacitor should not be grounded (or the capacity of the grounding
capacitor should not be increased).
Prohibited
Otherwise, it will result in failure or fire.
This inverter has a built-in noise filter (EMC noise filter for 480V class) and the inverter input power
supply is grounded via the capacitor. By switching this grounding capacitor, the leakage current from
the inverter can be reduced.
It is switched by changing the position of the exclusive switching screw(s) that varies depending on the
type. For some types, the grounding capacitor is completely disconnected (frame size A1 to A5). For
others, the capacitor capacity is reduced (frame size A6 to A8).
For the details of the influence of the leakage current and measures, refer to [2. 4. 3].
• Note that when the grounding capacitor is reduced or not grounded, the inverter unit no longer
comply with the EMC directive.
• Be sure to switch with the power off.
Important
• For models with two switching screws, be sure to set both screws to the same side.
Switch the grounding capacitor in the following procedure given for each type. At the time of shipping,
the grounding capacitor is grounded or its capacity is small.
M12 screw
M12 screw
WARNING
2-45
E6582062
Fan terminal
Fan terminal
M4 screw
Ground
capacitor
switching screw
Grounding terminal (M12 screw)
2. Installation and wiring
2
3
9
10