A06B-0373-B675#7076
A06B-0373-B675#7076
A06B-0373-B675#7076
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。
ACS510-01-038A-4 2
313-5BG04-0AB0 2
314-6EH04-0AB0 2
6DD1683-0CD5 一个
1756-OB32 1 面价8528
2711P-T7C21D8S 数量1面价15604
施耐德 控制器 SD328AU25S2 10件
3BHE013431R0001 1
HPC800K02
PIO800K02+HN800K02
TC卡AI04(16)
RTD卡 AI03(8)
VBX01T-VBX01B接头及电缆
S+安装机柜
TSXP57103M
TSXETY5103
TSXDEY08D2
TSXDSY08T2
TSXRKY6
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KEYENCE CORP LS-3060 LS3060
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