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1756-L60M03SE
1756-L60M03SE
如果PLC使用交流电源，在干扰较强或对可靠性要求很高的场合，可以在PLC的交流电源输入端加接带屏蔽层的隔离变压器和低通滤波器，隔离变压器可以抑制从电源线窜入的外来干扰，提高抗高频共模干扰能力，屏蔽层应可靠地接地。
低通滤波器可以吸收掉电源中的大部分“毛刺”，如用L1和L2来表示用来抑制高频差模电压，L3和L4来表示用等长的导线反向绕在同一磁环上的，50Hz的工频电流在磁环中产生的磁通互相抵消，磁环不会饱和。两根线中的共模干扰电流在磁环中产生的磁通是迭加的，共模干扰被L3和L4阻挡。C1和C2来表示用来滤除共模干扰电压，C3来表示用来滤除差模干扰电压。R表示压敏电阻，其击穿电压略高于电源正常工作时的**电压，平常相当于开路。遇尖峰干扰脉冲时被击穿，干扰电压被压敏电阻钳位，后者的端电压等于其击穿电压。
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TESCOM 64-2663KRL20 REGUL PRESS 1/2 VCRF.TESCOM 64-2663KRL20
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SEMITOOL 14885E-01 ASSY THERMOCOUPLE TRANSITION CENTER
MKS 122AA-01000AB PRESSURE TRANSDUCER TYPE 122A
AMAT 0242-70870 KIT, 20 SCCM, STEC, MFC, W HRDWR
LAM 853-370175-030 ASSY, CA, PM/TM INTLK, 30 FT
LAM 853-370681-001 ASSY,CA,FAN ISOLATION,DSQ
IPEC 0472-17066 BLOCK,STOP FWD LOAD STATION
FUJI PYX4MAY1-120YF CONTROLLER, TEMPERATURE PYX4
PROMETRIX 54-0172 ASSY, Z FOCUS FOR TESTER
PROCONICS CMS-1500 CONTROLLER, WIPSTATION, RCMS
高频干扰信号不是通过变压器的绕组耦合，而是通过初级、次级绕组之间的分布电容传递的。在初级、次级绕组之间加绕屏蔽层，并将它和铁芯一起接地，可以减少绕组间的分布电容，提高抗高频干扰的能力。 |
