6-5 NEMA Standard lead markings for dual-voltage, wye-wound motors in Visual Studio .NET

Encode PDF 417 in Visual Studio .NET 6-5 NEMA Standard lead markings for dual-voltage, wye-wound motors

109 6-5 NEMA Standard lead markings for dual-voltage, wye-wound motors
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Step 11 Once all leads have been properly and permanently tagged, leads T-4, T-5, and T-6 are connected together and voltage readings are taken between T-1, T-2, and T-3 The voltages should be equal and approximately 230 V Step 12 As an additional check, the motor is shut down and leads T-7, T-8, and T-9 are disconnected, and leads T-1, T-2, and T-3 are connected to the line Connect T-1 to the line lead T-7 was connected to, T-2 to the same line as T-8 was previously connected to, and T-3 to the same lead that T-9 was connected to With T-4, T-5, and T-6 still connected together to form a wye connection, the motor can again be started without a load If all lead markings are correct, the motor rotation with leads T-1, T-2, and T-3 connected will be the same as when T-7, T-8, and T-9 were connected The motor is now ready for service and is connected in series for high voltage or parallel for low as indicated by the NEMA Standard connections shown in Figure 6-6
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Three-Phase Delta-Wound Motors
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Most dual-voltage, delta-wound motors also have nine leads, as indicated in Figure 6-6, but there are only three circuits of three leads each Use continuity tests to find the three coil groups, as was done for the 110
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111 6-6 NEMA Standard lead markings for dual-voltage, delta-wound motors
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wye-wound motor Once the coil groups are located and isolated, make further resistance checks to locate the common wire in each coil group A DMM, Wheatstone bridge, or other sensitive device may be needed, since the resistance of some delta-wound motors is very low Each coil group consists of two coils tied together with three leads brought out to the motor junction or terminal box Reading the resistance carefully between each of the three leads shows that the readings from one of the leads to each of the other two leads will be the same (equal), but the resistance reading between those two leads will be double the previous readings; Figure 6-7 illustrates the technique: Step 1 The common lead found in the first coil group is permanently marked T-1, and the other two leads temporarily marked T-4 and T-9 The common lead of the next coil group is found and permanently marked T-2 and the other leads temporarily marked T-5 and T-7 The common lead of the last coil group is located and marked T-3 with the other leads being temporarily marked T-6 and T-8
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This procedure may not work on some wyeconnected motors with concentric coils
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Step 2 After the leads have been marked, connect the motor to a 230-V three-phase line using leads T-1, T-4, and T-9 Lead T-7 is connected to line and T-4, and the motor is started with no load connected Voltage readings are taken between T-1 and T-2 If the voltage is approximately 460 V, the markings are correct and may be permanently marked Step 3 If the voltage reading is 400 V or less, interchange T-5 and T-7 or T-4 and T-9 and read the voltage again If the voltage is approximately 230 V, interchange both T-5 with T-7 and T-4 with T-9 The readings should now be approximately 460 V between leads T-1 and T-2 The leads connected together now are actually T-4 and T-7 and are marked permanently The remaining lead in each group can now be marked T-9 and T-5, as indicated by Figure 6-7 Step 4 Connect one of the leads of the last coil group (not T-3) to T-9 If the reading is approximately 460 V between T-1 and T-3, permanently mark this lead T-6 If the reading is 400 V or less, interchange T-6 and T-8 A reading now of 460 V should exist between T-1 and T-3 T-6 is changed to T-8 and marked permanently and temporary T-8 is changed to T-6 113
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