IC695ALG508

 ic695alg508

plc和变频器的组合应用 

可编程控制器（plc）是一种数字运算与操作的控制装置。plc作为传统继电器的替代产品，广泛应用于工业控制的各个领域。由于plc可以用软件来改变控制过程，并有体积小，组装灵活，编程简单，抗干扰能力强及可靠性高等特点，特别适用于恶劣环境下运行。 

当利用变频器构成自动控制系统进行控制时，很多情况下是采用plc和变频器相配合使用，例如我厂二催化的自动吹灰系统。plc可提供控制信号和指令的通断信号。一个plc系统由三部分组成，即中央处理单元、输入输出模块和编程单元。本文介绍变频器和plc进行配合时所需注意的事项。 

1.开关指令信号的输入 

变频器的输入信号中包括对运行/停止、正转/反转、微动等运行状态进行操作的开关型指令信号。变频器通常利用继电器接点或具有继电器接点开关特性的元器件（如晶体管）与plc）相连，得到运行状态指令，如图1所示。 

在使用继电器接点时，常常因为接触不良而带来误动作；使用晶体管进行连接时，则需考虑晶体管本身的电压、电流容量等因素，保证系统的可靠性。 

在设计变频器的输入信号电路时还应该注意，当输入信号电路连接不当时有时也会造成变频器的误动作。例如，当输入信号电路采用继电器等感性负载时，继电器开闭产生的浪涌电流带来的噪音有可能引起变频器的误动作，应尽量避免。图2与图3给出了正确与错误的接线例子。 

当输入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（dc24v）之间的串扰。正确的连接是利用plc电源，将外部晶体管的集电极经过二极管接到plc。如图4所示。 

allen bradley plc card analog output # 1771-ofe1 b

allen bradley panelview 600 2711-b6c9 ser b rev j frn 4.21

allen bradley panelview 600

allen bradley output module 1171-ob series b * in box*

allen bradley osai cnc control rack, 86001887 r, 110-220 vac amp, os 5630, 

allen bradley mpl-b310p-sj72aa servo motor ser. a, pn-11310, missing cover

allen bradley motor starter 715-bod12 series k **

allen bradley motor control 1336f-aja4b 200a 20hp drive good. (74)

allen bradley monitor 800xccvd / 90752209 **

allen bradley micrologix 1500

allen bradley mc circuit breaker frame 140u j2l3 c50 w/ 140u jtl3 c50 trip unit

allen bradley lnq 100 om slc control system 6175 lmx multiplexer 6175 lom board

allen bradley laser barcode scanner, # 2755-l4fba, , warranty

allen bradley isolator board 102931 w/pc-20-220b14

allen bradley imc s-class integrated 4 axis motion controller 4100-214-r

allen bradley i/o module 1771-db 

allen bradley h-6200- a, ac servo motor, , worked when removed.

allen bradley frequency drive # 1336sbrf100aaen3c4

allen bradley expansion module for slc 150~ 1745-e151~

allen bradley electronic shutter camera 2801-yd *xlnt*

allen bradley data terminal / scanner, 2708-dh5a4l, , warranty

allen bradley contactor cat# 100-b250n*3 120v coil 3ph 250a

allen bradley compact i/o dsi/modbus rtu communication module cat no: 1769-sm2

allen bradley circuit board 900063-01  #29040

allen bradley cat # 1494g-cc3n dissconnect stainless steel enclosure

allen bradley bulletin 22d powerflex cat 22d-d2p3n104

allen bradley bulletin 1336 dynamic brake mod-kb005 ser d

allen bradley bulletin 1326 dc servo motor 1326ds-ld-fl-e1 13amp 40.6 lb-in

allen bradley analog output module 1771-ofe3 b f/w b 2.4a @ 5vdc w/ 1771-wc b

allen bradley ac motor drive 1336s-b010-an-en4-gm1-ha2-l6

allen bradley ac drive 22b-d017n104 ser. a * out of box*

allen bradley ac drive 1336s-b007-aa-en4-hap-l6 ser. d

allen bradley ac drive 1336e-b015-aa-en-ha2-l8e ser d

allen bradley ac drive 1336e-b015-aa-en-ha2-l7e ser a

allen bradley 808-m4 series f **

allen bradley 808-m3 series f **

allen bradley 80165-178-52-r

allen bradley 80165-138-53-r

allen bradley 8000-etz rev a01 cnc hand controller

allen bradley 713-cjb702 series m starter * out of box*

allen bradley 712 disconnect starter unit size 3 100amp

allen bradley 609-ahw 3 phase manual starting switch size 0

allen bradley 512-dab-6p-26r nema combination starter nema 3 480 vac

allen bradley 509-dob series a * out of box*

allen bradley 505bod7 nsnp **genuine** ab 505 bod 7

allen bradley 500l-d0b93 ac contactor, 100 amps

allen bradley 440l-r4j0640yd guardshield light curtain **

allen bradley 2755-dd1a series a dual decoder * in a box*

allen bradley 2711-k5a2 ser.b panel view 550 **

allen bradley 2711-k5a2 ser. b  panelview 550 operator panel 2711k5a2

allen bradley 2706-c21j8 series d dataliner display panel

allen bradley 22b-d012n04 series a **

allen bradley 22b-d012h204 series a *as is*

allen bradley 22a-d8p7n104 series a ac drive * in a box*

allen bradley 20bd2p1a0aynanco ac drive 1 h.p. ser. b

allen bradley 20ab6p8a0aynnnc0 2 hp 240 v 3 phase powerflex 70 vfd w/ keypad

allen bradley 2098-dsd-hv030-se ultra 3000 servo drive

allen bradley 1794if41 input module

allen bradley 1794 if41 flex 4 point analog input module series a plc

allen bradley 179116b0 16 point input dc block i/o module series b

allen bradley 1785-rc/a plc5 relay cartridge **

allen bradley 1783-mx08t stratix 8000 copper expansion module 8-port 16211

allen bradley 1775-sr5 i/o scanner (plc1728)

allen bradley 1775-sr5 a i/o scanner- communication adapter

allen bradley 1771-p7/d 120/220vac plc power supply

allen bradley 1771-om output module **

allen bradley 1771-of 12 bit analog output for plc 5

allen bradley 1771-l1 loop controller interface module

allen bradley 1771-ibd series b date code 9/97 *factory sealed*

allen bradley 1771-ibd series b date code 11/97 *factory sealed*

allen bradley 1771-ibd series b date code 10/97 *factory sealed*

allen bradley 1771-asb ser. e  remote i/o adapter module 1771asb

allen bradley 1770-ta industrial terminal monitor ser. b rev. c w/ 1770-fdc

allen bradley 1768-m04se

allen bradley 1764-lrp ser.c processor unit * in a box*

allen bradley 1756-m16se series a **

allen bradley 1756-m16se controllogix sercos ser a interface module b453680

allen bradley 1756-l61 series b controllogix 5561 processor f/w 1.9 mfg 09/07

allen bradley 1756-dnb ser.b communication module * in a box*

allen bradley 1747-l543 slc5/04 frn 10

allen bradley 1746-p4 ser. a power supply date: 08/25/02 *factory sealed*

allen bradley 1746-ni8 ser. a  analog input module 1746ni8

allen bradley 1746-a13, 1746-p2, spectrum 1746sc-ini4i, 1747-l531, 1747-ke (3j)

allen bradley 160-ba03nsf1 ser. c  analog s.f. speed controller 160ba03nsf1

allen bradley 160-ba01nps1p1 ser:c

allen bradley 160-aa04ps1-af-dn2c-dsx-emc-custom ac drive in enclosure *un*

allen bradley 15hp motor soft start smc-2 150-a24nb  in box

allen bradley 154-a11nc series a * out of box*

allen bradley 150-a09nc series a -  in box!

allen bradley 150-a05nb-nd 3hp smart motor control smc-2

allen bradley 1502-v4cbdi-i 400a 2500-5000v-ac 120v-ac vacuum contactor d487666

allen bradley 148150-04 display pcb circuit board

allen bradley 1409 arcing ground fault relay 1409-mv

allen bradley 1400-dcu *nice*

allen bradley 140093 **

allen bradley 1394-am04 series-b ac servo controller

allen bradley 1336s-b040-an-en4-ha1-l6 servo drive guaranteed

allen bradley 1336s-b010-an-en-gm1 10 hp vs ac drive 480v ab 1336sb010 no cover

allen bradley 1336-pb-sp9c *sealed*

allen bradley 1336-mod-kb010 dynamic brake series d *nib*

allen bradley 1336-bdb-sp2c control board a2

allen bradley 1336 15hp plus adj freq drive 1336f-brf150-af-en-hj2-la2 15hp (93)

allen bradley 1333-baa vfd ac speed 3hp drive 1333baa

allen bradley 1305-aa08a drive

836t-t400jx26 series a pressure control

42re1-1008 allen bradley / ea photoswitch scanner blue sensor nib  42re11008

4 allen bradley100-c12d*10 motor starter safety contactor 100s-c12dj14bc

1756-l55/a k01 & 1756-m12 g01 allen bradley controllogix ser a f/w rev 1.4

1333-aab allen bradley drive

*sealed* qel qas 51130a 000000 model qas 51000 qc 500 oxygen monitor

*  *allen bradley 1756-m16se controllogix sercos interface module 16 axis

*  * allen bradley 1771-sdn/c series c devicenet scanner module, 2-channels