Application Note- Wiring Grounding and Shielding Techniques.pdf

TACHSYN PHASE 1TACHSYN PHASE 2TACHSYN PHASE 3SHIELDTACHSYN EXCITATIONEXCITATION RETURNSHIELD123EXCIT.Figure 3B - ACCEPTABLEResolverwiringThe resolver is a six wire device. As with the Tachsyn, two of the wires are a highfrequency excitation signal. The remaining four wires are outputs which supplycommutation, velocity, and position information to the controller. These four wiresare separated into two distinct pairs: sine (S1 and S3) and cosine (S2 and S4).Hence the six wires are segregated into three pairs. Each pair must be run in aseparate shield to insure proper motor operation.S1S3S2S4R1R2S1S3S2S4R1R2SHIELDFigure 4A - UNACCEPTABLEThe resolver must always be wired as shown in Figure 4B. Any other wiring schememay result in improper motor operation.S1S3S2S4S1S3S2S4R1R2R1R2GroundingShieldingSHIELDFigure 4B - ACCEPTABLEThe grounding procedures listed in the controller installation manuals should befollowed. In general, the following rules should be observed.All component chassis ground points and signal ground or common points should betied together at a single point (star connection). This point should then be tied witha single conductor to an earth ground point. This form of grounding preventsground loops and insures that all components are properly grounded against shockhazard.In general, it is good practice to shield all wires carrying low level signals. This isespecially important if the signal level wires are run near power level wiring such asmotor wires or relay wires.When shielding wires, connect only one end of the shield, preferably the source end.Connecting both ends of a shield will result in ground loops. It is recommended thatthe unconnected end of the shield be insulated to prevent accidental connection.4 903-010400-01 Rev A