AMESim中Y型机能伺服阀不动作的问题

建立AMESim模型。
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AMESim中Y型机能伺服阀不动作的问题

伺服阀额定电流为-20mA,结果发现当我输入电流为-20mA时,P与A通，而是AB与T通。这是为什么？理论上输入-20mA应该是PA通，BT通啊

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