TSXDSY64T2K 触摸屏 输出模板

TSXDSY64T2K 触摸屏 输出模板

变频器的输入信号中包括对运行/ 停止、正转/ 反转、点动等运行状态进行操作的数字量输入信号（开关型指令信号），这些信号常来自PLC 的数字量输出信号。PLC 通常利用其内部的继电器接点（继电器输出型PLC）或具有开关特性的元器件（晶体管输出型PLC）与变频器相连，得到运行状态指令，如图1和图2所示。在进行数字量信号的连接时应注意：

（1）使用继电器输出型PLC与变频器相连时，应注意接触不良常带来变频器误动作，因此在实际接线中要注意连接可靠。

（2）使用晶体管输出型PLC与变频器相连时，应注意晶体管本身的电压的高低、电流的大小等限制条件在其范围内，保证系统的可靠性。

（3）设计变频器的输入信号电路时，应尽量避免采用继电器等感性负载，因继电器开闭产生的浪涌电流可能引起变频器的误动作。

（4）当PLC输出的开关信号进入变频器时，有时会发生外部电源和变频器控制电源之间的串扰，应注意对PLC和变频器分开接地，避免两者使用共同的接地线。

TSXDSY64T2K 触摸屏 输出模板

The input signal of the inverter includes the digital input signal (switch-type command signal) that operates on the running state such as run/stop, forward/reverse, and point, and these signals often come from the digital output signal of the PLC. The PLC usually uses its internal relay contact (relay output PLC) or a component with switching characteristics (transistor output PLC) to connect with the inverter to obtain the operating state instructions, as shown in Figure 1 and Figure 2. When connecting digital signals, note that:

(1) When the relay output PLC is connected to the inverter, it should be noted that poor contact often brings about the wrong operation of the inverter, so it should be noted that the connection is reliable in the actual wiring.

(2) When the transistor output PLC is connected to the inverter, attention should be paid to the limiting conditions such as the voltage level of the transistor itself and the size of the current within its range to ensure the reliability of the system.

(3) When designing the input signal circuit of the inverter, the inductive load such as relay should be avoided as far as possible, because the surge current generated by the opening and closing of the relay may cause the wrong operation of the inverter.

(4) When the switching signal output by the PLC enters the inverter, sometimes crosstalk between the external power supply and the inverter control power supply will occur, and attention should be paid to the separate grounding of the PLC and the inverter to avoid the use of a common grounding wire between the two.

TSXDSY64T2K 触摸屏 输出模板

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