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15. <strong>Appendix</strong> 3.2 Implementation of Noise Prevention Measures There are two types of noise prevention measures, those that correspond to the propagation route and those that counteract the effect of noise on the receiving side (side that is adversely affected by the noise). The basic measure to lessen the effect of noise on the receiving side is to: 1) Separate the main circuit wiring from the control circuit wiring, making it more difficult to receive noise. The basic measures to lessen the effect of noise on the generating side are to: 2) Install a noise filter to reduce the noise level. 3) Apply a metal conduit pipe or metal control panel to confine the noise level, and 4) Apply an insulated transformer for the power supply to cut off the noise propagation route. Table 1 lists the methods for preventing the noise problems, their goals and the propagation routes. Next, noise prevention measures are presented for the inverter drive configuration. (1) Wiring and grounding Separating the main circuit and control circuit as much as possible, both inside and outside the control panel, and the use of shielded wire and twisted shielded wire, makes it more difficult to receive noise and allows wiring distances to be minimized (refer to Figure 7). Take notice that the wiring of the main circuit and control circuit does not become bundled or parallel wiring. Figure 7 Method of Separating Wiring For the main circuit wiring, a metal conduit pipe is used and grounded through a grounding wiring to prevent noise propagation (refer to Figure 8). The shield (braided wire) of the shielded wire is securely connected to the base (common) side of the signal line at only one point to avoid the loop formation resulting from a multi-point connection (refer to Figure 9). The grounding is effective to not only to reduce the risk of electric shocks, but also to block noise penetration and radiation. Corresponding to the main circuit voltage, the grounding work should be No. 3 grounding work (300V AC or less) and special No. 3 grounding work (300 to 600V AC). Each ground wire is to be provided with its own ground or separately wired to a grounding point. Figure 8 Grounding of Metal Conduit Pipe Figure 9 Treatment of Braided Wire of Shielded Wire 15-5
Table 1 Noise Prevention Methods Wiring and installation Control panel Anti-noise device Treatment on the noise receiving side Others Noise prevention method 15-6 Goal of noise prevention measure Make it more difficult to receive noise Cutoff noise conduction Confine noise Reduce noise level Conduction route Separate main circuit and control circuit � � Minimum wiring distance � � � � Avoid parallel and bundled wiring � � Use appropriate grounding � � � � Use shielded wire and twisted shielded wire � � � Use shielded cable in main circuit � � � Use metal conduit pipe � � � Appropriate arrangement of devices in panel � � � Metal control panel � � � Line filter � � � � Insulation transformer � � � Use passing capacitor � � � Use ferrite core for control circuit � � � � Line filter � � � Separate power supply systems � � Lower the carrier frequency ∆ � � � (2) Control panel The control panel containing the inverter is generally made of metal, and this metal box can shield noise radiated from the inverter itself. Further, when installing other electronic devices such as a programmable logic controller in the same control panel, attention should be paid to the arrangement of each device. When necessary, a noise prevention measure should be implemented, such as installing a shielding plate between the inverter and peripheral devices. Conduction noise Induction noise Radiation noise
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