L0056340

L0056340

L0056340

L0056340

数字量信号连接应注意的问题

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P L C ）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P L C 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P L C 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P L C 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P L C和变频器分开接地，避免两者使用共同的接地线。

640-0AA00-0AX0   2

25B-D6P0N104            2   面价5438

25B-D4P0N104        2     面价4538

25B-D013N104        1  面价8207

25B-D010N104         2   面价6575

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ACS880-01-025A-3/11KW          1

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1766-L32BWAA   1 面价8001

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3RK1093-2SS10  6

A16B-3200-0500  1

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6ES7322-1HF01-0AA0   1

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6ES7 531-7KF00-0AB0   1

6ES7 532-5HF00-0AB0   1

6SL3040-0LA00-0AA1     1

AB37-P16T214  1

ABE7-P16T214

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2711P-T7C4D8 面价45992

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2711P-T15C22D9P    面价54566

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1734-IR2/C 面价2635

1756-IB32/B 面价6077

1756-OW16I 面价8048

1756-IF8 面价13653

1756-OF8    面价  25663

1794-IE8/B 面价 9147

1794-OE4/B   面价 8240

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