The winch shown in the illustration operates...

Question 1 / 2066636eed28f7522a1c51dd74

Question 1 of 2066636eed28f7522a1c51dd74

The winch shown in the illustration operates in any of the positions with the master switch in the 'lower' direction, but will not 'hoist' in any of the master switch hoist speed positions. Which of the listed faults would MOST likely be the cause? Illustration EL-0102

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🔍 Key Concepts

• Trace the control circuit paths for hoist (H) and lower (L) coils from the UV (undervoltage) contact downward. • Look at how the limit switches LSL and LSH are wired and which motion each one can interrupt. • Notice what would happen to BOTH directions if the undervoltage relay (UV) or overload (OL) contacts opened.

💭 Think About

• When the winch lowers in all lower positions, which parts of the control circuit MUST already be working correctly? • Which single component, if failed open, would affect only the hoist direction but leave the lower direction completely normal? • If the motor overload or UV contacts opened, would power still be available to either coil H or coil L? Check the common points they share.

✅ Before You Answer

• Verify which terminals go directly to the H coil versus the L coil, and which devices are in series with each. • Confirm whether LSL (5–6) is in the hoist or lower path, and whether LSH (9–10) is in the hoist or lower path. • Check whether an open at UV 1–2 or at the overload (OL) contact would remove control power from BOTH hoist and lower, or only one direction.

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Question 1 of 20

The lower limit switch (LSL) contacts across terminals 5 and 6 have failed open.

The hoist limit switch (LSH) contacts across terminals 9 and 10 have failed open.

The undervoltage relay contacts between terminals 1 and 2 have failed open.

The AC hoist motor has tripped out on overload, permitting only lowering.

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Question 1 / 2066636eed28f7522a1c51dd74

Question 1 of 2066636eed28f7522a1c51dd74

Back

Question 1 of 20

66636eed28f7522a1c51dd74

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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