6.4 Selecting Options
6-31
Chap. 6 SELECTING PERIPHERAL EQUIPMENT
[ 6 ] Zero-phase reactors for reducing radio noise (ACLs)
An ACL is used to reduce radio frequency noise emitted from the inverter output lines. Pass the total
of four wires--three inverter output wires and a grounding wire through the ACL in the same passing
direction four times. If shielded wires are used, pass them through the ACL with their shields four
times. Be sure to use wires with a heat resistance of 75°C (167°F) or above.
The ACL absorbs high-frequency noise components and emits them as heat into the air so that the
amount of heat generation can be large. If it happens, lower the carrier frequency, upgrade the
heat-resistance rank of wires, increase the number of the ACLs to decrease the number of turns per
ACL, replace the ACLs with higher type ones, or take any other measures.
The wire size is determined depending upon the ACL size (I.D.) and installation requirements
. Refer
to Table 6.13.
Figure 6.12 Dimensions of ACL and Connection Example
Table 6.13 Wire Size Selection (ACL)
Installation requirements Wire size
ACL type
Q'ty Number of turns (mm
2
) (AWG)
1 4 5.5 or below 10 or below
2 2 14 or below 6 or below
ACL-40B
4 1 38 or below 1 or below
1 4 14 or below 6 or below
2 2 60 or below 1/0 or below
ACL-74B
4 1 250 or below 500 or below
Be sure to use wires with a heat resistance of 75°C (167°F) or above
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