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| Re: R211a sets (1633736) | |||
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Re: R211a sets |
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Posted by Stephen Bauman on Sun Jul 7 17:14:10 2024, in response to Re: R211a sets, posted by 3-9 on Sun Jul 7 16:14:25 2024. What generally causes a motor to cut out like that?Somebody acquainted with maintenance and repair would be better equipped to answer. Here are two suspects. 1. Steel dust. The motors run hot. They have forced air ventilation to keep the wires cool. Steel dust could cut or short the wires or block the ventilation paths. This would cause motor wires to overheat and melt. 2. The brake fails to release. Traction voltage is applied. This means the motor which presents both an ohmic and reactive load. The reactive load is greatly reduced, if the rotor winding cannot turn. The motor's ohmic load alone cannot handle the applied current. The windings melt, causing a dead motor, before the brake might release. |
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