If coils 'R1-R2-R3' at the receiver of...

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Question 1 of 205eccefa4bacbc34ba4d4828b

If coils 'R1-R2-R3' at the receiver of figure "C" shown in the illustration turned opposite of those in the transmitter, what action should be taken to have both turn in the same direction? See illustration EL-0092.

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🔍 Key Concepts

• Selsyn/synchro rudder indicator circuits – which coils are the rotor (supply) and which are the three stator coils? • Effect of reversing leads – what happens if you reverse the two rotor (S1–S2) leads vs. interchanging any two of the three stator (R1–R2–R3) leads? • Wiring shown in Figure C – note carefully which terminals on the receiver correspond to the transmitter’s R1–R2–R3 and S1–S2 connections.

💭 Think About

• On a synchro pair, if the receiver turns opposite to the transmitter, which set of windings must have two leads swapped to reverse the direction of torque: the rotor supply leads or two of the three stator leads? • Look at each answer choice and ask: does this option keep the 60 Hz supply confined to S1 and S2 while only changing the relative connections among the R1–R2–R3 coils, or does it mix supply and stator circuits in a way that would be incorrect? • If you interchange two of the three R leads on the receiver only, what effect does that have on the magnetic field alignment between transmitter and receiver?

✅ Before You Answer

• Make sure S1 and S2 remain the 60 Hz supply leads and are not accidentally tied into the three-coil (R1–R2–R3) network. • Confirm that the option you pick only interchanges two of the three R-leads on the receiver, leaving the transmitter wiring unchanged. • Verify on the diagram that after the change, each R terminal on the receiver is still connected only to R terminals on the transmitter, not to the supply.

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