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Power Cable Filter for an Outdoor Unit
In a shielded equipment room, outdoor unit power cables must be used together with a filter that has the following topology and component parameters.
Figure A-1 Filter topology
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A, B, and C are connected to the indoor unit. A', B', and C' are connected to the outdoor unit. E is the PE point for the filter, which is grounded nearby.
Table A-1 Filter component specifications
Position No. |
Name |
Specifications |
Deviation |
Remarks |
|---|---|---|---|---|
L |
Common-mode inductor |
22.5–45 mH @ 10 kHz |
- |
Ultra-microcrystal inductor, which can withstand 16 kHz switching frequency and does not generate heat due to saturation |
Cy |
Y capacitor |
2.7 nF @ 10 kHz |
±10% |
Thin film feedthrough capacitor |