11.15 Zero-phase Reactors for Suppressing Radio Noise (ACL)
11-77
SELECTING PERIPHERAL EQUIPMENT
11.15 Zero-phase Reactors for Suppressing Radio Noise (ACL)
An ACL is used to reduce radio frequency noise emitted from the inverter output wiring, and therefore inverter output
wiring should be passed through the ACL. Pass all four wires including the three inverter output wires and grounding
wire through the ACL in the same direction. If using shielded wires, the shields should also be passed through the
ACL. Be sure to use wires with heat resistance of 75 °C (167 °F) or higher. It is recommended that wiring should
be passed though in a single turn.
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 11.15-1.
Fig. 11.15-1 External dimensions and connection example for zero-phase reactor for suppressing radio noise
(ACL)
Table 11.15-1 Zero-phase reactors for suppressing radio noise (ACL)
Inverter output wire size
Applicable zero-phase
reactor
38 mm
2
or less
5.5 mm
2
× 2P to 22 mm
2
× 2P
1AWG or less
AWG 10 × 2P to AWG 4 × 2P
250 mm
2
or less
38 mm
2
× 2P to 100 mm
2
× 2P
500 kcmil or less
AWG 2 × 2P to AWG 4/0 × 2P
150 mm
2
×2P to 325 mm
2
×2P
150 mm
2
×3P to 325 mm
2
×3P
250 mm
2
×4P to 325 mm
2
×4P
250 kcmil×2P to 600 kcmil×2P
250 kcmil×3P to 600 kcmil×3P
400 kcmil×4P to 600 kcmil×4P
60 mm
2
or less
5.5 mm
2
× 2P to 22 mm
2
× 2P
AWG 1/ or less
AWG 10 × 2P to AWG 4 × 2P
*1 HIV (heat-resistant polyvinyl chloride insulated wire) and crosslinked polyethylene are anticipated.
*2 THW (heat-resistant IV cable) is anticipated.
Zero-phase reactor Inverter
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