1756-L7SP企业信息化2711P-T10A8The power cord
某氟化公司DCS系统(集散控制系统)的催化剂进料调节阀信号间歇出现oop(输出信号线断)报警，同时该调节阀瞬间全开，造成催化剂流量异常波动，严重影响装置的稳定运行。
故障原因分析及处理
1.故障原因分析
由于出现的是oop报警，自然怀疑是信号线断，对该信号线路进行检查，结果线路完好。先判断是其dcs卡件故障，对报警点的dcs卡件进行更换，但故障仍未得到解决。这时，我们意识到一定是存在干扰，从而对该dcs信号造成影响。为减少干扰，对仪表接地进行改造，但故障仍未解决。经过对该dcs信号点排查，后只剩下由变频器送至dcs的信号线值得怀疑。为证实干扰源是由变频器产生，我们将该变频器的出线电缆从铁氧体环中穿过，并将变频器至dcs的信号线与变频器的输入、输出线尽量远离并交叉。通过以上措施，dcs上该点的oop报警频率有一定程度下降。这就证实了干扰源来自变频器。那么下一步的措施就是尽量减少变频器的干扰。 厦门控匠
为了消除变频器对dcs信号的干扰，我们采取了如下措施，将接地线加粗并将接地点尽量靠近变频器;同时，将变频器送dcs的信号线在变频器出线侧穿钢管敷设，并将钢管可靠接地。通过以上措施，dcs出现oop报警的频率明显降低，但仍未能消除变频器干扰。会不会是变频器故障呢?为此我们更换了变频器，干扰信号马上消除。就当我们以为解决问题的时候，该故障又在一个月后出现。至此，该故障点除了变频器至dcs的信号线未更换，其他元器件都已经更换过。于是，我们将该屏蔽信号线进行了更换，结果故障得到了解决。
2.降低变频器对dcs信号干扰的措施
该故障是由于变频器至dcs的距离较远(200m)，原屏蔽控制线质量较差，导致变频器高频信号通过至dcs的控制线影响附近信号线。同时，以下措施能较好的降低变频器的干扰：
(1)合理布线
能在相当大程度上削弱干扰信号的强度，布线时，各种设备的控制线应尽量远离变频器的输入、输出线。控制线在空间上，应尽量和变频器的输入、输出线交叉，是垂直交叉。
(2)削弱干扰源
接入电抗器或滤波器，对小功率变频器，成本较高，我们采用一种低成本的电磁干扰方法：将电机电缆从铁氧体环中穿过，使穿过部分导线的阻抗局部增大，阻止电磁干扰电流通过。如将导线在铁氧体环上绕几圈，总的电感和阻抗值将随圈数的平方而增大。电机电缆可从铁氧体环中穿过三次。但应注意，连接电机和变频器的接地线应留在环外。
(3)对线路进行屏蔽
变频器到电动机之间的连接线，应尽量穿入金属管内，金属管应该接地。信号线屏蔽层不论是接公共端还是接地，都只能在一端进行，切不可两端都接。
(4)准确接地
接地线应尽量地粗一些，接地点应尽量靠近变频器;接地线应尽量远离电源线;变频器所用地接地线，和其他设备地接地线分开;避免把所有设备的接地线连在一起后再接地;变频器的接地端子不能和电源的“零线”相接。
毕竟精血大损，可不是开玩笑的事情。
3HAA1001-173 Sealing Ring
3HAA1001-174 Sync. plate
3HAA1001-176 Cover Axis 4
3HAA1001-181 SPRING WASHER
3HAA1001-186 Washer
3HAA1001-189 SPHERICAL ROLLER BEARING
3HAA1001-196 HEX.SOCKET HEAD CAP SCREW
3HAA1001-199 CAP
3HAA1001-200 SUPPORT WASHER
3HAA1001-201 Contaktholder
3HAA1001-202 CONTACT HOLDER
3HAA1001-207 RADIAL BEARING
3HAA1001-21 Pinion
3HAA1001-218 HOSE CLIP
3HAA1001-230 Spiral hose
3HAA1001-24 Gear
3HAA1001-243 Cable gland
3HAA1001-244 Cable gland
3HAA1001-262 Gear
3HAA1001-267 Washer
3HAA1001-282 SUPPORT PLATE
3HAA1001-297 Friction Washer
3HAA1001-302 Cover
3HAA1001-305 Cover
3HAA1001-316 OTOR BRACKET, L.H.
3HAA1001-317 Shaft
3HAA1001-33 Cover axis 4, machining
3HAA1001-334 WEIGHT ADAPTER
3HAA1001-342 SYNC MOUNT AXIS 2 SHELF
3HAA1001-343 SYNC MOUNT AXIS 3,4 SHELF
3HAA1001-344 SYNC MOUNT AXIS 5,6
3HAA1001-346 BRACKET FOR SYNC PLATE
3HAA1001-347 BRACKET FOR SYNC PLATE
3HAA1001-39 Hub machining
3HAA1001-500 Cover
3HAA1001-501 Cover
3HAA1001-513 Instruction label
3HAA1001-519 INPUT GEAR
3HAA1001-522 Input Gear
3HAA1001-525 Hood for 25p D.sub
3HAA1001-526 Hood for 15p D.sub
3HAA1001-531 SLEEVE
3HAA1001-578 Straight Union
3HAA1001-603 HOLDER
3HAA1001-604 COVER
3HAA1001-605 FLANGE
3HAA1001-606 BRACKET
3HAA1001-607 GASKET
3HAA1001-608 GASKET
3HAA1001-612 AIR FILTER
3HAA1001-613 FRICTION RING
3HAA1001-614 FRIKTION RING
3HAA1001-616 FRIKTION RING
3HAA1001-622 Damper axis 3
3HAA1001-628 Sealing
3HAA1001-630 DUST CAP
3HAA1001-632 Washer
3HAA1001-636 CABLE HOLDER
3HAA1001-658 O-RING
3HAA1001-668 HOLDER
3HAA1001-670 CONNECTION BOX
3HAA1001-672 CABLE CLAMP
3HAA1001-691 Cable guide rail
3HAA1001-695 Bottom plate
3HAA1001-700 Cover with gasket
3HAA1001-701 Gasket
3HAA1001-71 PARALLEL ROD MACHINING
3HAA1001-716 Grease tube
3HAA1001-718 Cable protection
3HAA1001-719 COVER
3HAA1001-721 GUIDE FOR CABLING
3HAA1001-727 ENVIRONMENTAL DUST CAP
3HAA1001-73 Sync. plate, axis 1
3HAA1001-74 Sync. plate, axis 2
3HAA1001-75 Sync. plate, axis 3