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[ 5 ] Ferrite ring reactors for reducing radio noise (ACL)
An ACL is used to reduce radio frequency noise emitted by the inverter.
An ACL suppresses the outflow of high frequency harmonics caused by switching operation for the power
supply lines inside the inverter. Pass the power supply lines together through the ACL.
If wiring length between the inverter and motor is less than 66 ft (20 m), insert an ACL to the power supply
lines; if it is more than 66 ft (20 m), insert it to the power output lines of the inverter.
Wire size is determined depending upon the ACL size (I.D.) and installation requirements.
Figure 6.12 Dimensions of Ferrite Ring for Reducing Radio Noise (ACL) and Connection Example
Table 6.13 Ferrite Ring for Reducing Radio Noise (ACL)
Installation requirements Wire size
Ferrite ring type
Q
'ty
Number of
turns
[inch
2
(mm
2
)]
0.003 (2.0)
0.005 (3.5)
1 4
0.009 (5.5)
0.013 (8)
ACL-40B
2 2
0.022 (14)
0.013 (8)
1 4
0.022 (14)
0.034 (22)
0.059 (38)
2 2
0.094 (60)
0.156 (100)
0.234 (150)
0.313 (200)
0.391 (250)
ACL-74B
4 1
0.508 (325)
The selected wires are for use with 3-phase input/output lines (3 wires).
[Unit : inch (mm)]
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