1771-RTP31771-RTP3）

1771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP31771-RTP3
1、引言
在国产高压变频器的设计中，为了提高高压变频器内部控制的灵活性以及在现场应用的可扩展性，通常在高压变频器中内置PLC。自从20世纪70年代台PLC诞生以来，PLC的应用越来越广泛、功能越来越完善，除了具有强大的逻辑控制功能外还具其他扩展功能:A/D和D/A转换、PID闭环回路控制、高速记数、通信联网、中断控制及特殊功能函数运算等功能，并可以通过上位机进行显示、报警、记录、人机对话，使其控制水平大大提高。
本文以广州智光电机有限公司为攀钢集团成都钢铁有限公司污水处理厂设计生产的国产高压变频器ZINVERT-H800/B10为例，介绍了三菱PLC在高压变频器控制系统中的运用。
2、广州智光电机高压变频器简介
广州智光电机有限公司推出的新一代ZINVERT系列智能高压变频调速系统为直接高－高型变频调速系统，通过直接调节接入高压电机定子绕组的电源频率和电压来实现电动机转速的调节从而达到节能的目的。它是集大功率电力电子控制技术、微电子技术、高速光纤通信技术、自动化控制技术和高电压技术等多学科为一体的高新技术产品。该产品采用主流双DSP控制系统和大规模集成电路设计，通过的数字移相技术和波形控制技术实现了高压电机的灵活调节和能耗控制。
3、PLC在国产高压变频器中的设计使用
3.1 PLC主要逻辑控制
（1）用户要求高压变频器在出现故障停机时能快速自动切换到工频旁路运行，笔者给高压变频器配置了可以实现自动旁路功能的旁路柜，如图1所示，K1～K4为手动操作刀闸，J1～J3为高压真空接触器。在变频器发生故障时，旁路柜可以在几秒内完成从变频到工频的转换;而变频器在工频运行时，通过1个按钮就可以实现变频器从工频到变频的转换。这样的控制要求增加了变频器整机控制逻辑的复杂性。

图1 自动旁路柜
自动旁路柜控制逻辑简要介绍如下：
变频调速系统退出变频转工频运行有两种方式，一种是自动方式，一种是手动方式，选择自动方式时，当变频器发生停机故障时变频器自动从变频转工频;选择手动方式时则需人工操作。
变频调速系统退出工频转变频运行也有两种方式，一种是自动方式，一种是手动方式，选择自动方式时，只需在控制柜上按一个按钮，变频器就自动完成从工频转变频;选择手动方式时则需人工操作.
（2）PLC控制系统原理图
PLC主机选用输入输出点数48点，型号为FX2N-48MR，PLC作为系统逻辑量控制的控制核心，在自动旁路柜的逻辑关系控制中起着至关重要的作用。PLC控制系统原理图如图2所示。

图2 PLC控制系统原理图
旁路柜的逻辑控制要求比较复杂，采用PLC控制，接线简单，提高了可靠性;旁路柜的逻辑更改也变得很简单，只需修改PLC梯形图程序就可以了，很方便满足用户现场的控制要求。
（3）PLC功能指令实现高压变频器PID闭环控制
用户现场对变频器闭环控制提出的要求是:变频器能够根据用户系统用水量的变化，自动调整变频泵的转速，实现管网恒压供水;同时还可以在液晶屏上设定压力目标值。
针对用户的要求，PLC另外配置了模拟特殊模块FX2N-4AD和FX2N-2DA。FX2N-4AD为模拟输入模块，有四个输入通道，大分辨力12位，模拟值输入范围为-10V～10V或者4～20mA;FX2N-2DA为模拟输出模块，有2个输出通道，大分辨力12位，模拟值输出值范围为-10V到10V或者4到20 mA。这样通过读取指令（FROM）和写入指令（TO），以及PLC带有的PID闭环控制功能指令（如图3所示），就可以实现对用户现场的管网水压进行PID闭环控制。

图3 带有的PID闭环控制功能指令的PLC 程序
其具体编程过程是这样:PLC读取指令（FROM）读取用户水压反馈值，把反馈值用移动指令（MOV）存入PID指令中的D12数据地址里; 把用户的水压设定值用移动指令（MOV）存入PID指令中的D10数据地址里;D200～D222保存PID的运行参数;D14为PID指令的运算值输出，通过PLC的写入指令（TO）把PID闭环运算结果D14写入模拟输出模块，再通过模拟输出模块转换成-10V～10V或者4～20mA的模拟信号送入高压变频器控制器进行频率设定。
在进行PID运行参数设置时，P、I、D的参数设定尤其重要，其设定的好坏直接关系到管网水压控制的好坏。P表示比例增益，设定范围为0～99(%)，比例调节设定大，系统出现偏差时，可以加快调节，减少误差，但是过大的比例增益，会造成系统不稳定;I表示积分时间，设定范围为0～32767(*100ms)，积分时间越小，积分作用就越强，反之I越大则积分作用弱;D表示微分时间，设定范围为0～32767(*10ms)，微分调节有的控制作用，合适的微分时间能改善系统的动态性能。
攀钢污水处理厂供水管网比较庞大，管网水压对水泵转速的变化响应比较缓慢， 因此PID的计算速度不能过快，即比例调节不能过快，否则如果管网水压突然变化大时，变频器的调节容易形成较长时间的振荡。根据这一情况，如图3所示，可以在PLC控制程序中加入PID间隔计算时间 （T0）以及PID运算死区（M0），这样就可以把PID的计算速度调节至与管网水压变化速度相一致，避免管网水压震荡。
（4）PLC功能指令实现PLC与变频器上位机通信
为了使变频器上位机能对PLC进行显示、报警及记录，PLC还配置了通信模块FX2N-232BD，实现与变频器上位机的串口通信，通信编程指令如图4所示。

图4 通信编程指令
PLC RS232串口通信可使用无协议（RS指令）或协议与上位机进行通信，本例中使用无协议与上位机进行通信，如图四所示:D8120用于设定PLC通信格式，D50表示发送起始地址，K60表示发送字节数量，D150表示接收起始地址，K20表示接收字节数量。
4、结束语
高压变频器自动旁路柜采用PLC进行旁路逻辑控制，通过在攀钢污水处理厂运行的智光高压变频器模拟故障说明，高压变频器自动旁路柜在从变频转工频，工频转变频的相互切换非常方便，能在10s以内完成，大大提高了水泵运行的可靠性。现场PID闭环控制效果非常理想，水压波动非常小，波动在超过0.1kg时，变频器能迅速调节转速，把水压控制在设定范围内，调节转速时不会产生任何振荡。同时通过PLC与高压变频器控制器的串口RS-232通信，在高压变频器液晶屏上能监视系统管网水压及PLC各种状态量。



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Allen Bradley 1492-CB1H100 Circuit Breaker 10AMP 1 Po
One-day shipping available

NEW Allen Bradley 100-M12NZ*31 /B 100-M12NZ 100M12NZ31
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Allen Bradley Contactor 100-A12ND3 120V (3499)

Allen-Bradley MOTOR STARTER CONTACTOR 100-B300N*3 Ser B
Expedited shipping available

ALLEN BRADLEY 1745-E101 SLC 100 PROGRAMMABLE CONTROLLER
One-day shipping available

6591 NEW Allen-Bradley 100-M05N*3 Contactor 16-20amp

NEW ALLEN-BRADLEY 100-A24NZ243 24VDC CONTACTOR

ALLEN BRADLEY 100-B250ND3 ELECTRIC MOTOR CONTACTOR 120V
Expedited shipping available

ALLEN BRADLEY 100-C12*10 CONTACTOR 115VAC COIL **XLNT**

100-A18NZ*3 Allen Bradley 24v - 18a Contactor
One-day shipping available

Allen Bradley 100-C16KY10 Contactor 3pole 48V Coil NEW

Allen Bradley 1492-CB3G100 Breaker 3 p 10 amp din rail
One-day shipping available

2 ALLEN BRADLEY 100-MO5NZ*31 CONTACTORS & ONE 199-MSMD1
Expedited shipping available

Allen Bradley AC Contactor 100-A24NB3 New in Box!

Allen Bradley Sola PSupply SDN 2.5-24-100 SDN2.5-24-100

Allen Bradley 100-FSD250 Surge Suppressor Diode (3004)

NEW ALLEN BRADLEY 100-C30ZJ00 CONTACTOR

Allen Bradley Disconnect 1494V-DS100 Ser B 1494VDS100 +

Allen Bradley H-3016-N-1-100AA AC Servo Motor

Allen Bradley SLC 100 1745-LP103 ser D FRN 5 processor

ALLEN BRADLEY (1494R-N100) 100AMP DISCONNECT SWITCH NEW

Rare! ALLEN BRADLEY SLC 100 150 1745-TCAT

New Allen-Bradley 100-A30NZ243 Contactor

4 ALLEN BRADLEY 800MR-W100 LEGEND PLATE NIB 800MRW100

Allen Bradley Non-Fusible Disconnect Switch 1494F-N100

1492-GH100 ALLEN BRADLEY SINGLE POLE CIRCUIT BREAKER
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Allen Bradley 140-MN-0250 Manual Starter & 100-A09ND3

(6) NEW ALLEN-BRADLEY LEGEND UNIT 800E-12BE100
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AB Allen Bradley Safety Relay 100-C23Z*10 with 100S-F

Allen-Bradley 100-C60*00 100C60D00 120v coil GOOD! C60

Allen Bradley 100 C60*00

ALLEN BRADLEY AB TERMINAL BLOCKS 1492-J4 LOTS OF 100

100-A45N*3 Allen Bradley 120v - 45a Contactor
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LOT 100 ALLEN-BRADLEY TERMINAL BLOCKS 1492LG2Q

Allen-Bradley 10HP CONTACTOR / RELAY 100-A12NA3 Ser. B
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1336F-BRF100-AA-EN Allen Bradley 1336FBRF100AAEN
One-day shipping available

ALLEN BRADLEY 836T-T261J PRESS CONTROL SWITCH 8-100 PSI

Allen Bradley Bul 100 AC Contactor 30hp @ 460v

ALLEN BRADLEY 100-C60D*00 CONTACTOR 100C60D00

Rare! ALLEN BRADLEY SLC 100 1745-LP103 & EPROM Module
Excellent Condition! No Broken Or Discolored Plastic

ALLEN BRADLEY 100-FA04 Contact Block Series A NEW
One-day shipping available

Allen Bradley 100-C09DJ10 IEC Contactor

Allen Bradley AB 1336S-B075-AN-EN-L6 75/100 HP V Drive

Allen Bradley 100-B110N*3 Contactor 110 Amp #28472

ALLEN BRADLEY SAFETY RELAY 700-ZBR100AZ1 700Z 24V
One-day shipping available

ALLEN BRADLEY SLC 150 SLC 100 Complete Manual Set

ALLEN BRADLEY 100-A09NZ*3 CONTACTOR LOT OF 2

Allen Bradley Ethernet Switch 1783-SFP100FX New

ALLEN BRADLEY 1785-M100 1785M100 MEMORY MODULE PLC5
One-day shipping available

NEW ALLEN BRADLEY 100-C30DJ10 CONTACTOR

Allen Bradley 1745-E101 1745E101 SLC 100 Expansion Unit

Allen Bradley 100-FSD250 SER A SURGE SUPPRESSOR DIODE

New Allen Bradley PowerFlex 700 20BD125A0ANNAND0 100HP
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Allen Bradley 100-C09Z*400 193-EA1CB

ALLEN BRADLEY 100-B110NZ*3 CONTACTOR 75 HP 120V COIL
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Allen Bradley 100-C12ZJ01 100C12ZJ01 Contactor

100-A12ND*3 Allen Bradley 120v - 12a Contactor
One-day shipping available

1336F-BRF100-AN-EN Allen Bradley Drive 1336FBRF100ANEN
One-day shipping available

Allen Bradley Safety Relay 700-ZBR100AZ1, 700ZBR100AZ1

Allen Bradley 100B110NA3 Contactor 100B110NA3 NEW
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Allen Bradley 2100 100 Amp Fusible Motor Control Bucket

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(6) Allen Bradley Relays 100-A12D3 Series B
Expedited shipping available

ALLEN BRADLEY 800H-1HA SER. M PUSH BUTTON VV-100

Allen Bradley 100A09ND3 Contactor W/ Overload Relay

Allen Bradley 100-B400 N*3 350 Hp @ 460 Volt 480 V Coil

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Allen Bradley Auxiliary Contacts Side Mnt 100-SA20

Allen Bradley 100-A75N*3 Contactor 75A

Allen Bradley 1492-CB2 G100 Circuit Breaker
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ALLEN BRADLEY / 100-KFSD250 / NIB / Lot Sale 39
Expedited shipping available

2pc Allen Bradley Bulletin 100 Contactor

6182-ADAZZZ Allen Bradley 6182ADAZZZ N100
One-day shipping available

Allen Bradley 100-C23Z*10 Contactor 3-Pole 100C23Z10

Allen Bradley 1745-LP101 SLC 100 Processor Unit SeriesD

(2) Allen Bradley 100-A09ND3 Ser. B Contactor 100A09ND3

Allen Bradley #100-C09Z*10 Contactor 24Vdc Coil U 1/5/3

Allen Bradley 100-FSV55 Ser A SURGE SUPPRESSOR 12-55V

Allen Bradley 700-HA32Z24 Relay w/700-HN100 Base
One-day shipping available

NEW ALLEN BRADLEY CONTACTOR 100-NX165D 120V 100NX165D
Expedited shipping available

Allen Bradley Contactor 100-A24ND3 120v 195-BA11 aux

Allen-Bradley 100-C37Z 100-F 100-FSD250

ALLEN BRADLEY CONTACTOR # 100-A24ND3 SERIES A
3 NIB ALLEN BRADLEY 100-SB10 AUXILIARY CONTACT BLOCK

Allen Bradley Circuit Breaker 1492-CB1 H100 10 AMP

ALLEN-BRADLEY, SLC 100 PLC, PLC, EXPANSION UNIT, UNUSED
Expedited shipping available

Allen Bradley SLC100 Programmable Controller 1745-LP103

ALLEN BRADLEY 100-C09*10 CONTACTOR (475)

Allen Bradley SLC-100,SLC-150 Senes Replacement Battery

Allen Bradley 1492-GH100 Series B Style GH AMP Breaker

ALLEN-BRADLEY 100-C12Z*10 CONTROL RELAY

Allen Bradley AC Lighting Contactor 100 Amp 600 VAC

Allen Bradley High Power Contactor 100-C43D*00

1745-E101 Allen Bradley SLC 100 Expansion Unit 1745E101

ALLEN BRADLEY 100-A30NC3 AC CONTACTOR NEW 100A30NC3
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Allen Bradley 100-CF400* Ser A Contactor

Allen Bradley SLC 100 Programmable Control #6065LR

New Allen Bradley Select Switch 100T-SS2MB1 100TSS2MB1
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ALLEN BRADLEY 100-A60NZ*3 CONTACTOR 60 AMP COIL 24 VDC
One-day shipping available

Allen Bradley 1783-SFP100FX Ethernet Switch NEW

Allen Bradley 100-B180N*3 Contactor

Allen Bradley 100-C43DJ00 Contactor 24VDC 3P New

Nice ALLEN BRADLEY 700-ZBR100AZ1 SAFETY RELAY

Allen Bradley 100 A75N *3 120 Volt Control Contactor

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Allen Bradley Motor Contactor, #100-C37*00, Ser C
One-day shipping available

ALLEN BRADLEY SLC-100 PROGRAMMABLE UNIT & EXPANSION....

Allen Bradley Contactor 100*A45N*3 Coil 195-GA10 A-B

ALLEN-BRADLEY, SLC 100 PLC, EXPANSION UNIT
Expedited shipping available

ALLEN BRADLEY 1745-LPE101 SLC100 EXPANSION PROCESSOR

Allen Bradley 100-C09D10 Contactor starter relay NEW

Allen Bradley AB 100-A75N*3 SER C, with 193-A1K3
One-day shipping available

Allen Bradley Contactor Cat No.: 100-B250N*3

Allen-Bradley 100-C09D10 Contactor

Allen Bradley 100A09ND3 Contactor W/ Overload Relay

100-A12NZ*3 Allen Bradley 24v - 12a Contactor
One-day shipping available

ALLEN BRADLEY 100-A18NA3 SER A 18A 18 AMP AC CONTACTOR

ALLEN BRADLEY (1494V-H1) A 100A OPERATING HANDLE NEW

100 Ohm A-B ALLEN BRADLEY Tube Hum Potentiometers

ALLEN BRADLEY 1492-CB1G100 CIRCUIT BREAKER 10 AMP 1 p

Allen-Bradley FUSE MOUNTING BLOCKS HOLDER 100A X-410710
Expedited shipping available

Allen-Bradley 700-HA32Z24/700-HN100 Relay & Base

Allen Bradley Contactor / Breaker 100-A75N w/ Aux Ser C

ALLEN BRADLEY 1745-LP101 SERIES D SLC100 PROCESSOR NICE

ALLEN BRADLEY 1745-LP101 SERIES D SLC100 PROCESSOR NICE

ALLEN BRADLEY DEVICE CONTRACTOR CONTACT BLOCK 100-CO9Z
Expedited shipping available

Allen Bradley 100-A09NZ*3 100A09NZ3 Contactor

ALLEN BRADLEY 100-A75N*3 CONTACTOR

Allen Bradley 190-MN 190-P100 Ser A Contactor

Allen Bradley 100-A18NZ*3 Contactor Starter Series B

new Allen Bradley 120V 240v Contactor 480v 100-B400N*3
One-day shipping available

Allen Bradley AC Contactor 100-A24NB3 New!!

LOT OF 3 ALLEN BRADLEY 100-A09NZ* SERIES B CONTACTERS

Allen Bradley 1492-CB1G100 Circuit Breaker Series B
Allen Bradley 1492-CB1G100 Circuit Breaker Series B
One-day shipping available

Allen Bradley 100-FA31 SER A AUXILIARY CONTACT BLOCK

2 ALLEN BRADLEY 100-SA10 SER. B NEW

Allen Bradley 140U-H3C3-D10 100 Amp Circuit Breaker NEW

Allen-Bradley CAT 100-A12 3-Pole Contactor

Allen Bradley 100-A30NKD3 contactor New pullout
One-day shipping available

NOS! ALLEN BRADLEY REVERSE CONNECTION KIT 100-D420-VLTB

Allen Bradley SLC 100 processor unit 1745-LP101

Allen Bradley 100 A38N 3 Ser C

Allen Bradley Contactor 100-A60N*3 W/193-CPC63 Relay

Allen Bradley Contactor 100-A12ND3 120V w O/relay (3498

Allen Bradley 100-A12ND3 Contactor W/ 195-BA01 Contacts

Allen Bradley 100-A09ND3 Contactor Ser B & 193-BSB 42 B

ALLEN-BRADLEY 1784-CP6 / SER A / NIBBO $100

Allen Bradley 100-A45N*3 Contactor W/ 195-GA10 Contact

QTY.1 ALLEN BRADLEY IEC CONTACTOR #100-A75ND3 - USED
One-day shipping available

Allen Bradley Cat: 100-B250N*3 Contactor

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ALLEN BRADLEY 100-A09ND3 STARTER REVERSING W/ 193-BSB22

ALLEN BRADLEY CONTACTOR 100-A24ND3 AUX RELAY 195-FA40
Expedited shipping available

ALLEN BRADLEY 100-A09ND3 LOT 100A09ND3

Allen-Bradley Ultra3000i Series B 2098-DSD-HV100X

ALLEN-BRADLEY 100A DISCONNECT SWITCH BUL. 1494F

100 Allen Bradley 1/8 watt resistors,33 OHMS,5%TOL.CC.
Expedited shipping available

ALLEN BRADLEY CONTACTOR 100-A60N*3 SER C 100A60N3 3PH

Allen Bradley IEC Starter 100-A09ND3 Overload 193-BSB30
One-day shipping available

Allen Bradley 1745-C2 1745C2 SLC 100 150 Cable Used
One-day shipping available

ALLEN BRADLEY 100-A09NZ*3 CONTACTORS, LOT OF 4

Allen Bradley 100-A12ND3 Contactor Series A

ALLEN BRADLEY CONTACTOR AUXILLIARY CONTACT BLOCK 100-FL
Expedited shipping available

Allen-Bradley 100-C23D*10 Ser C Contactor

Allen Bradley Circuit Breaker 1492-CB2 H100

Allen Bradley 100-A60N*3 60 Amp Contactor A60 Motor

1336S-BRF100-AN-EN5 Allen Bradley 1336SBRF100ANEN5 N160
One-day shipping available

Allen Bradley 1492-GH100 SER B CIRCUIT BREAKER 10A 250V

Allen Bradley Starter Contactor 100-C72D LOW PRICE!!

Allen-Bradley AB 100-A75N*3 Contactor 193-A2K3 relay

ALLEN-BRADLEY 100A DISCONNECT SWITCH BUL. 1494F

Allen Bradley 100-C09D10 Contactor Series A Brand New

ALLEN-BRADLEY 100A DISCONNECT SWITCH BUL. 1494F

*NEW SEALED* Allen Bradley 1785-M100 PLC5 Memory Module
60 DAYS WARRANTY! QUANTITY AVAILABLE!
One-day shipping available

Allen Bradley Contactor 100-A30ND3 NEW IN BOX

Allen Bradley 10A 2-Pole Circuit Breaker 1492-CB2-H100

1785-M100 Allen Bradley PLC 5 memory 1785M100 N376
One-day shipping available

ALLEN BRADLEY 100-A09ND3 STARTER 193-BSB16 OVERLOAD

ALLEN BRADLEY CIRCUIT BREAKER 10A 1492-SP1D100 ASPH3

Allen Bradley 150-A135NBD SMC Plus 100HP Soft Start

NEW ALLEN BRADLEY 1336S-BRF100-AA-EN4-HA2-L6 10HP DRIVE

Allen Bradley Contactor 100-A38ND3 Tested guaranteed
One-day shipping available

Allen Bradley 100-A45NJ3 Series C Contactor NIB

Allen Bradley SLC 100 Processor Unit 1745-LP101 PLC

Allen Bradley 100-A45NJ3 Series C Contactor NIB

Allen Bradley SLC 100 Processor Unit 1745-LP101 PLC

Allen Bradley 100-A24NZ*3 100-A24NZ 3 Contactor
One-day shipping available

Allen Bradley 100-A18NZ*3 100-A18NZ 3 Contactor USED
One-day shipping available

Allen Bradley Non-Reversing Contactor w/ OLR 100-A38ND3

Allen Bradley 100-FSD250 SER A SURGE SUPPRESSOR DIODE

ALLEN BRADLEY CONTACTOR AUXILLIARY CONTACT BLOCK 100-F
One-day shipping available

ALLEN-BRADLEY CONTACTOR 100-A18NJ3