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厦门市仲鑫达自动化设备有限公司 490NAA21302
销售专员；陈国如
电话；18030132586 QQ；1151195663
厦门市思明区湖滨东路湖光大厦8楼A座490NAA21302
系统接地方式有：浮地方式、直接接地方式和电容接地三种方式。对PLC控制系统而言，它属高速低电平控制装置，应采用直接接地方式。由于信号电缆分布电容和输入装置滤波等的影响，装置之间的信号交换频率一般都低于1MHz，所以PLC控制系统接地线采用一点接地和串联一点接地方式。集中布置的PLC系统适于并联一点接地方式，各装置的柜体中心接地点以单独的接地线引向接地极。如果装置间距较大，应采用串联一点接地方式。用一根大截面铜母线（或绝缘电缆）连接各装置的柜体中心接地点，然后将接地母线直接连接接地极。接地线采用截面大于22 mm2的铜导线，总母线使用截面大于60mm2的铜排。接地极的接地电阻小于2Ω，接地极最好埋在距建筑物10 ~ 15m远处(或与控制器间不大于50m)，而且PLC系统接地点必须与强电设备接地点相距10m以上。
信号源接地时，屏蔽层应在信号侧接地；不接地时，应在PLC侧接地；信号线中间有接头时，屏蔽层应牢固连接并进行绝缘处理，一定要避免多点接地；多个测点信号的屏蔽双绞线与多芯对绞总屏电缆连接时，各屏蔽层应相互连接好，并经绝缘处理。选择适当的接地处单点接点。
LOT OF 2!! ConVUM MPS-74M-NGHX DIGITAL VACUUM PRESSURE SWITCH W/4 SENSORS MPS-R8
LOT OF 3!! MOELLER T0-2-1 ON/OFF CAM SWITCH 14AMP 3PH 600VAC
MURATA CSTLS16M053-A0 BUILT-IN CAPACITOR HOLE RESonATOR 16MHz 15pF (450 PIECES)
CORRECT TOKYO 0.75X?- 4.5X ZOOM LENS C-MOUNT UNIT
FUJI ELECTRIC COMMAND SWITCH AH30-ZM WM?PILOT LIGHT
490NAA21302
OMRON C500-OD412 PLC?OUTPUT UNIT 32-POINT 24VDC
RKC THERMO COUPLE SENSOR PROBE 25MM GROUNDED 2 METERS CABLE?0.75 (2 NEW PIECES)
NEW!! IDEC ALFD22211DNG GREEN ILLUMINATED PUSH-BUTTON DIRECT?LED 24V
DEARBORN CDT 461816-9Z WIRE 18 AWG 200?FT.
CORRECT TOKYO 0.75X?- 4.5X & 0.25X ZOOMLENS C-MOUNT UNIT 43097
SUNX RT-410-1 PHOTOELECTRIC SENSOR THRU?BEAM SIDE SENSING 2M RT - 410 - 1
TURK UPROX 8MM PNP PROXIMITY SENSOR 24VDC W/ CABLE
MODICON PC-M984-230?PLC MICRO MODULE 984?SERIES PROGRAMMABLE?ConTROLLER 115/230V
LOT OF 5!! MARATHON?NZ2010-20200 MICA NOZZLE HEATER 2" DIA.?x 1" W 240VAC 200W
LOT OF 5!! GOULD MODICON AS-B351-001 INPUT MODULE 115VAC
OMRON PLC GT1-ROP08?REMOTE RELAY UNIT 8-POINTS 24VDC
50 NEW PIECES!! OIL?SHAFT SEALS 12 x 20?x 6 MM
8 NEW PIECES!! SHAWMUT AJT3 TIME-DELAY FUSE 600V 3A
UNITECH PW120-3 PC-WAND BAR CODE INPUT TERMINAL WEDGE DECODER 9VDC
LG ABS 32 MOLDED CASE CIRCUIT BREAKER 2-POLES 600V MAX 30AMP
490NAA21302
4 NEW PIECES!! PIT 30 x 50 x 11MM NITRILE OIL SEAL
2 NEW PIECES!! BIMBA?F0-311-V METRIC FLAT CYLINDER
LOT OF 5!! CR CHICAGO RAWHIDE10123 OIL SEALS (NEW)
COOPER BUSSMAN LPJ-70SP DUAL ELEMENT TIME DELAY FUSE 70A 600VAC (2 PIECES)
1000 NEW PIECES!! SLOTTED SET SCREW FLAT?POINT 1/4-28 x 1/4?ZINC
LOT OF 6 FITTINGS!!?MILTON BRASS FITTING1/2" HOSE BARB MALE
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