如果不采用这样一种新的参数或重新参数化，也可能提供两个单独的与两个相反旋转方向相应的控制输入，并通过如一继电器来交替地启动。
Two single control inputs corresponding to two reverse rotation direction can be provided to start the driver via a relay instead of via the parameter.
与继电器，这是一个昂贵的前景，因为它是由一个面板上的主要精力重新布线完成。
With relays, this was a costly prospect, as it was accomplished by a major rewiring effort on the panel.
关闭开关。 重新安装后上灯电路继电器。
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