本文将机车继电器控制电路等效为数字组合逻辑电路，建立了它的固定故障等效模型。

The electric locomotive bang-bang circuit is converted into an equivalent digitalcombinational logic circuit for setting up its stuck-at fault model.

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抖动，说明极有可能是消磁电阻损坏，如果没有响声则可能继电器及其控制电路有问题。

Jitter, that is very likely damage degaussed resistance, in the absence of sound may be the relay and control circuit problem.

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使用继电器、接触器、按钮、空气开关、行程开关等低压电器构成的控制电路称为继电接触控制电路。

Use relays, contactor, button, air switch and travel switch etc low-voltage constitute control circuit called relay contact control circuit.

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