Measures To Satisfy The Emc Directive - Toshiba TOSVERT VF-AS1 Instruction Manual

9.1.2 Measures to satisfy the EMC directive

This subsection explains what measures must be taken to satisfy the EMC directive.
Models with a built-in filter
(1) 200V class: VFAS1-2004PL~2075PL
400V class: VFAS1-4007PL~4280KPC
The above mentioned models install EMI noise filter inside. So the conducted and radiated noise can be reduced,
optional EMI noise filters are not needed.
(If a further noise reduction is required, insert an additional filter on the primary side of the inverter.)
(2) Use shielded power cables and control signal cables for the input and output lines of the inverter. Route the cables
and wires so as to minimize their lengths. Keep a distance between the power cable and the control cable and
between the input and output wires of the power cable. Do not route them in parallel or bind them together, instead
cross at right angle.
(3) Install the inverter in an enclosed steel cabinet. Using wires as thick and short as possible, earth the control panel
securely with a distance kept between the earth cable and the power cable.
(4) To limit the radiation noise from cables, earth each shielded cable to the noise cut plate. It is effective to earth
shielded cables in the vicinity of the inverter and filter (within a radius of 10cm from each of them). Inserting a ferrite
core in a shielded cable is even more effective in limiting the radiation noise.
(5) To further limit the radiation noise, insert a zero-phase reactor in the inverter output line and insert ferrite cores in
the earth cables of the noise cut plate and cabinet.
[Ex. Countermeasure - inverter wiring]
9
Control wiring (Shielded cabless)
Contact input F, R, ST, RES, S1
Power supply wiring (Shielded cabless)
R/L1, S/L2, T/L3
Braking resistor wiring (Shielded cabless)
PA/+, PB
~
S3, CC
Fig. 1
I-2
Strip and earth the shielded cable,
following the example shown in
Fig.
Peel off the outer sheath of the
cable and fix the shielded part with a
metal saddle.
Noise cut plate
Control wiring (Shielded cabless)
Analog output FM, AM, CCA
Control wiring (Shielded cabless)
Analog input VI/II, RR/S4, PP, CCA
Motor wiring (Shielded cabless)
U/T1, V/T2, W/T3
E6581301