TSX07312422 30
TSX07312422 30
1 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,因此在实际接线中一定要注意连接可靠。
(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。
2 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。
VEXTA PX245M-02AA-M MOTOR, VEXTA WITH MOUNTING PLATE
AMAT 0150-04418 CABLE ASSY, INTERCONNECT, SENSORS TO SP
AMAT 0720-90620 CONN RCPT 230A CRIMP END
ESTEK PCB, VACUUM CHUCK CONTROL 398-18886-1S
NOK PNEUMATIC CYLINDER F-TEC FXTWS-SD15-30 2-39-66134
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EPSON THERMOSENSOR, R35N700000600
AXCELIS LINER, INNER STRIKER PLATE 17338580
AXCELIS LINER, VG PUMP HOUSING 17236720
AMAT 1400-90011 SENSOR,LIGHT,TYPE L34 STYLE B
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ONTRACK 12-8882-020 ASSY, DC MOTOR & CONNPRE-PROD
ORIENTAL 41K25GN-C MOTOR, AC
AMAT 0620-01020 CABLE ASSY CONT TURBO PUMP 5.0 FT
AMAT 0140-09226 HARNESS ASSY SYS CONTROLLER POWER DIST
AMAT 0150-09042 ASSY CABLE BACKING TC B
AXCELIS INSULATOR, FLAG FARADAY BURN 17B7966
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AMAT DOOR BACKING, PROCESS DOOR 300 MM0040-13881
TEL INSULATION, SHOWER 5 MB3M10-308780-11
AMAT 70201040100 EXT.GATE CABLE S-12
AMAT 0020-13521 WAFER REST, LEFT, DUMMY CASSETTE
AMAT 1270-01109 PRESSURE SWITCH SPDT
NOVELLUS 72-00051-00 WRENCH, PRESET 15.0 LBF. IN
WATLOW ANAFAZE PANEL INTERCONNECT CARD 31040-23
ASM AMERICA PCB, PRESSURE INTERFACE 2506505-21
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AMAT 0227-06543 75 FT OZONATOR TO REMOTE AC BOX
AMAT 0150-22633 CABLE ASSY, ROBOT RS232 INTCON WL ECP
AMAT 0227-46831 CABLE,SIGNAL TOWER 15FT EXT:MAINT. SW.
AMAT 0020-31834 HINGE,PIVOT,METCH
AMAT 0150-20690 CABLE ASSY PRINTER 5500
AMAT 0020-37587 COVER,EXHAUST GAS BOX,MXP CENTURA
AMAT 1950607 OPERATION CONSOL GROUND
VARIAN BLOCK, BEARING, SUPPORT E18003590
APPLIED SCIENTIFIC CARD, IO AND PHOTO DIODE IO-PD-MOD
AMAT VALVE, TURBO ISO W/STEM MDC 0190-40017 KAV-150-P
资讯来源:中海德李工
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