Toshiba TOSVERT VF-AS3 Instruction Manual page 33

(2) Examples of measures to comply with EMC Directive
The following are measures to comply with the EMC Directive when you use totally enclosed
box type of VF-AS3 by installing it in other machines and systems.
• Examples of general measures
• When adding an EMC filter for further reduction of noise
• Measures for operation with external signals
The following are general EMC measures explained concretely.
Power supply wiring
(No shielded grounding needed)
[R/L1], [S/L2], [T/L3]
Using shielded power wires and shielded control wires
• Use shielded power wires, such as inverter input/output wires, and shielded control wires.
• Route the wires and wires so as to minimize their lengths.
• Keep a distance between the power cable and the control wire and between the input and
output wires of the power cable. Do not route them in parallel or bind them together.
Instead, if necessary, cross at right angle.
Routing input and output wires apart
• Route the input and output wires apart as far as possible from each other.
Grounding of shielded wires
• To ground shielded wires through a metal conduit.
• To ground the shielded control wires by fixing the metal saddle of the body.
• Inserting a ferrite core in a shielded wire is even more effective in limiting the radiated noise.
Inserting zero-phase reactor and ferrite cores
• Insert a zero-phase reactor in the inverter output line.
• Insert ferrite cores in the grounding wires of the metal plate.
Motor wiring
(Shielded grounding needed)
[U/T1], [V/T2], [W/T3]
3-3
Cable
Screws (x2)
Clamp
When the shielded wires need grounding,
modify before installing as shown in the
figure below.
Peel off the outer sheath of the cable
and fix the shielded part with a clamp.
3. Measures to satisfy standards
E6582162c