6FC5250-4BX10-3AH0
6FC5250-4BX10-3AH0
6FC5250-4BX10-3AH0
3、 模拟量信号连接应注意的问题变频器中的模拟量输入信号,通常指0~10V/5V 的电压信号或0/4~20 mA的电流信号;这些模拟量输入信号可通过接线端子由外部给定,当变频器与P L C 连接时,这些模拟量输入信号也可来自PLC 的模拟量输出信号,如图3 所示。在进行模拟量的连接时应注意:
(1)阻抗匹配。根据变频器的输入阻抗选择P L C 的输出模块,实现两者的阻抗匹配。
(2)电压范围。当变频器和P L C 的电压信号范围不同时(如变频器的输入信号为0~10V,而PLC 的输出电压信号范围为0~5V 时;或PLC 的一侧的输出信号电压范围为0~10V而变频器的输入电压信号范围为0~5V时),需采用串联电阻的方式进行分压,以保证两者在正常电压范围内
工作,避免电压过限可能损坏器件。
(3)采用屏蔽电缆或绞合电缆。对于变频器和P L C 而言,弱电控制信号(电压0~5V/10V、电流0/4~20mA等)易受到外界强信号的干扰,对控制信号采取适当的屏蔽措施。常用的方式就是采用屏蔽电缆进行屏蔽;对于长距离的控制回路宜采用绞合电缆,绞合电缆的绞合间距尽可能小。
(4)主、控电缆分开布线。实际连线时,注意主、控电缆分开布线,且相隔的距离。以保证主电路侧的干扰及噪音影响不到控制电路。
Siemens simodrive 611 6SN1118-0DG23-0AA1 sinumerik NEW
Siemens simodrive 611 6SN1118-0DH21-0AA1 Regelungseinsc...
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Siemens Sinumerik Software 6FC5250-4AX30-4AH0 PCMCIA
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Siemens simatic 6FX1120-5BB01 NEU sinumerik
Siemens 6FC5203-0AB10-0AA0 OP sinumerik bedientafel S7
Siemens Sinumerik NCU 573.4, 6FC5357-0BB34-0AE1 NEU NEW
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Sinumerik NCU 356 6FC5356-0BB11-0AE0 Siemens NEU OVP
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11-3-----------+
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