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PLC与变频器连接应用注意事项
变频器是将固定电压、固定频率的交流电变换为可调电压、可调频率的交流电装置。变频器广泛应用于节能、自动化系统及提高工艺水平和产品质量等方面。变频器的问世,使电气传动领域发生了一场技术革命,即交流调速取代直流调速,变频调速被公认为最有发展前途的调速方式。
可编程序控制器简称PLC(Programmable Logic Controller),它是一种数字运算与操作的控制装置,广泛应用于工业控制的各个领域。PLC 通过软件编程和硬件连接可实现各种复杂的控制任务,控制功能强大,是当代工业控制的三大支柱之一。作为工控产品,变频器和PLC 常配合使用(PLC 作为编程器,变频器作为驱动器),完成各种控制任务。
P L C 与变频器的连接主要方式有:PLC 的数字量输出信号与变频器的数字量输入信号相连;PLC 的模拟量输出信号与变频器的模拟量输入信号相连。实际应用中,就两者正确连接时应注意问题总结如下。同时,变频器运行时会对周围电气设备产生较强的电磁干扰,为防止变频器运行时对PLC 干扰,两者相连接时应重点考虑的问题总结如下。
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。在进行模拟量的连接时应注意:
(1)阻抗匹配。根据变频器的输入阻抗选择P L C 的输出模块,实现两者的阻抗匹配。
(2)电压范围。当变频器和P L C 的电压信号范围不同时(如变频器的输入信号为0~10V,而PLC 的输出电压信号范围为0~5V 时;或PLC 的一侧的输出信号电压范围为0~10V而变频器的输入电压信号范围为0~5V时),需采用串联电阻的方式进行分压,以保证两者在正常电压范围内
工作,避免电压过限可能损坏器件。
(3)采用屏蔽电缆或绞合电缆。对于变频器和P L C 而言,弱电控制信号(电压0~5V/10V、电流0/4~20mA等)易受到外界强信号的干扰,必须对控制信号采取适当的屏蔽措施。常用的方式就是采用屏蔽电缆进行屏蔽;对于长距离的控制回路宜采用绞合电缆,绞合电缆的绞合间距尽可能小。
(4)主、控电缆分开布线。实际连线时,注意主、控电缆分开布线,且相隔一定的距离。以保证主电路侧的干扰及噪音影响不到控制电路。
3 变频器运行时对PLC干扰应注意的问题
变频器运行时会对周围电气设备(包括P L C )产生较强的电磁干扰,同时变频器主电路断路器等开关器件动作时也会影响PLC 的正常工作。为防止变频器运行时对PLC干扰,变频器与P L C 相连接时应该注意以下几点:
(1)对PLC 本身应按规定的接线标准和接地条件进行接地,而且应注意避免和变频器使用共同的接地线,且在接地时使二者尽可能分开。
(2)当电源电压波动大,谐波成分多时,为抑制谐波干扰,应在PLC 的电源模块及输入/ 输出模块的电源线上接入噪音滤波器或者隔离变压器。如果干扰仍严重,应考虑在变频器主回路中接入电抗器、专用变压器和噪音滤波器等措施。
(3)变频器和P L C 安装在同一电控柜时,应尽可能使与变频器有关的电缆和与PLC 有关的电缆分开安装,尤其是连接变频器的强电电缆与连接PLC 的弱电电缆更要分开安装。
4 结束语
变频器和P L C 间连接问题,涉及到数字量信号连接、模拟量信号连接以及避免干扰应注意的问题;在实际应用中,两者间的连接还涉及到用弱电信号控制强电的问题。因此,应引起重视,避免干扰造成变频器、PLC 的误动作;避免连接不当造成PLC 或变频器的损坏。
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KOHLER POWER SYSTEM 150A AUTOMATIC TRANSFER SWITCH K-168541-150
PILZ SAFETY RELAY PNOZ X3P 24-240VACDC 3N/O 1N/C 1SO
BANNER FIBER OPTIC SENSOR HEAD OSEFX *NEW*
PHOENIX CONTACT 60VDC 2A 8 CHANNEL VARIOFACE MODULE, FLKM-14/8M/SI/P?LC
COSEL 24V 1.3A POWER SUPPLY P30-24 *LOT OF 2*
ABB 3-POLE 2* CIRCUIT BREAKER S203-C25
ALLEN BRADLEY 200A 600VAC/250VDC 3 POLE DISCONNECT SWITCH 1494V-DS200 SER. C
IAI ROBO CYLINDER ACTUATOR DRIVE RCP-C-SA5I-P
BANNER VALU-BEAM 24-250VAC PHOTOELECTRIC SENSOR SM2A912FQD *NEW*
FUJI ELECTRIC 200-220VAC COIL 50A MAGNETIC CONTACTOR SC-2N(50)
BANNER 10-250V VALU-BEAM PHOTOELECTRIC SENSOR SMA91E
CONTROL CONCEPTS 120VAC 50/60HZ 20A ISLATROL ACTIVE TRACKING FLITER I-120
ATLAS COPCO TRANSDUCER ART 26-50, 60815-444 *NEW*
ITW VORTEC 701 PANEL GUARD, NIB
MOELLER SINGLE-POLE 4A CIRCUIT BREAKER FAZ G4A-CNA *LOT OF 5*
BANNER MINI-BEAM 24-240VAC FIBEROPTIC SENSOR SM2A312FPQDP
PAPST 230V 80x80x38mm AC AXIAL COMPACT FAN 8550 N
GENERAL ELECTRIC 0-5 A-C AMPERES PANEL MOUNT METER, 250340LSLS *NEW*
ALLEN BRADLEY MEMORY MODULE 2760-SFC1 SER. A REV. B
COSEL K SERIES 24V, 6.* SWITCHING DC POWER SUPPLY L150AU-24-N
GENERAL ELECTRIC 9T23B3874 DRY TYPE TRANSFORMER 75 KVA 480 208/120 V W/ DISC
GE 300A 3-POLE CIRCUIT BREAKER TJJ436300
SOLA 95-130/190-260/?380-520V TO 120V CONSTANT VOLTAGE TRANSFORMER 23-23-125-8
TELEMECANIQUE 3A 240V LIMIT SWITCH XCKL102
BUSSMANN 600VAC 300VDC 6A CUBEFUSE, TCF6
HONEYWELL BALL JOINT ASSEMBLY 27518 *LOT OF 3, NEW*
APPLETON EXPLOSION PROFF DUST-IGNITIONPR?OOF LUMINAIRE
OMRON 5-24VDC INPUT, 24-240VAC 60A SOLID-SATE RELAY G3PA-260B-VD
CUTLER HAMMER LIMIT SWITCH HEAD E50DR1
OMRON 24VAC/DC SAFETY RELAY G9SA-301
ASCO 3/8IN. NPT 10.1W 50PSI SOLENOID VALVE WITH BASE 8215G10 *NEW NO BOX*
MICROSWITCH 250VAC ROLLER PLUNGER LIMIT SWITCH DTE6-2RQ9
ANDERSON POWER PRODUCTS 600V 350A HEAVY DUTY POWER CONNECTOR 906 *NEW*
REES 600VAC 250VDC RED & GREEN HEAVY DUTY PUSH-BUTTON SWITCH 347S *NEW NO BOX*
SIEMENS SINUMERIK SIMODRIVE CABLE ASSEMBLY 6SN1161-1CAA00-?0BA1
HONEYWELL CABLE CONNECTOR 117053 *NEW*
IFM EFECTOR 500 CONTROL UNIT FOR PART SEAT MONITORING PS7570
GENERAL ELECTRIC THYRISTOR DIODE 410403-24AW
STI 1/2W 600V ARC SUPPRESSOR KIT 43127-0010 *NEW*
IDEC IZBARL RELAY BARRIER IBRC 6062R
AEG POWERBLOCK RECTIFIER MODULE 120632-DT *LOT OF 2*
SYMBOL BATTERY CHARGER SERVICE MODULE WP2446-US11
CHALLENGER 480VAC 22* 3-POLE MOLDED CASE SWITCH SF-3-8-225NA
TRERICE 4-1/2", 0-30PSI, PRESSURE GAUGE 600 *NEW*
SOURIAU UTGO1619P 19 PIN CONNECTOR, NEW IN BAG
OHMITE 15W 30OHMS POWER WIREWOUND RESISTORS TUW15J30R *NEW LOT OF 19*
ALLEN BRADLEY PROCESSOR CABLE 1771-CO
VICKERS +5V/+15V/-15V POWER SUPPLY MODULE 02-158215 REV. B
ORIENTAL MOTOR SUPER VEXTA PULSE GENERATOR XG6100S
FUJI ELECTRIC FANUC TRANSISTOR MODULE EVL31-060 / A50L-001-0103 *LOT OF 3*
EATON / CUTLER-HAMMER 10-30VDC INDUCTIVE PROXIMITY SENSOR E57EAL8T110EP *NEW*
ALLEN BRADLEY 110V/115-120VAC COIL SIZE 0-1 OPERATING COIL CB236 *NEW*
NAMCO 10-30VDC 4-PIN PROXIMITY SENSOR EE210-61304 *NEW IN BOX*
COOPER CROUSE-HINDS * 300V 3 POLE AC FEMALE MICRO MINI RECEPTACLE 5000114-394
SOLA 15VDC 3A REGULATED DUAL OUTPUT DC POWER SUPPLY SLD-15-3030-15T
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APPLETON 120/277VAC 20A 1 POLE MOUNTING COVER, EFK-F12-Q *NEW*
ALLEN BRADLEY 600V 60A 3 PHASE SAFETY SWITCH, 1494G-CF3N SER. 1 *NEW*
STI NON-CONTACT SAFETY INTERLOCK CONTROL UNIT MC-S024/110/220
TELEMECANIQUE 24VDC COIL 50A CONTACTOR LP1 D3210
TAIYO 24VDC DIGITAL FLOW SWITCH, DFS3-1200-DC24V?-5
MILWAUKEE 14.4V MOTOR ASSEMBLY 14-50-0785 *NEW*
POTTER & BRUMFIELD 60VDC 3A OUTPUT MODULE ODC-5 *LOT OF 5*
ALLEN BRADLEY CABLE ASSEMBLY 1777-CA *NEW*
MARATHON 11* 600V 3 POLE POWER DISTRIBUTION BLOCK 1423552
GE GENERAL ELECTRIC 3-POLE 400A CIRCUIT BREAKER E11592-R
TURCK 20-250VAC 10-300VDC PROXIMITY SENSOR Ni2-Q6,5-ADZ32-?0.1-FSB5.4X4/S3?04 *NEW
RATHGEBER KITZINGEN 488/465/442V TO 380V STEP DOWN TRANSFORMER ET 5000 CNA
FEDERAL PACIFIC T4T30 DRY TYPE TRANSFORMER 3 PH 30 KVA 480 208Y/120 VAC
GOULD SHAWMUT 15.5Kv 20E CL-14 CURRENT LIMITING FUSE 225-007-969
EBM 230VAC 50/60Hz SINGLE-PHASE THERMALLY PROTECTED COOLING FAN W2E200-HH38-07
COOPER BUSSMANN 1* LOW-PEAK FUSES LPN-RK-15SP *NEW BOX OF 10*
3D INSTRUMENTS 0-100PSIG RANGE, 1/4"NPT PRESSURE GAUGE 25504-23B51 NSAA *NEW*
TOSHIBA IGBT MODULE MG15G1AL2 *LOT OF 5*
HONEYWELL 600VAC, 250VDC MAX MICRO SWITCH LIMIT SWITCH BZE6-2RQ8 *NEW*
RS 2-POLE 16A CIRCUIT BREAKER 157-9888 C16
EUCHNER PROGRAMMABLE ABSOLUTE ENCODER PWF-PKZS016S071?540 *NEW IN BOX*
SQUARE D 110/120VAC COIL SIZE 4 MOTOR STARTER CLASS 8536 TYPE SF0-1
NMB 24VDC 0.6A BRUSHLESS FAN 3610ML-05W-B49
MURR ELEKTRONIK M12X1 SIZE, 4 PIN CONNECTOR 00027606 *NEW*
ACME TRANSFORMER 3-PHASE 480V AC LINE REACTOR ALRC-025TBC *NEW*
SIEMENS 16KW 3 PHASE CHOKE 6SN1111-0AA00-0?BA1
TEXAS INSTRUMENTS PLC MOUNTING BASE 7MT902
KEARFOTT 6 WIRE RESOLVER CONTROL TRANSFORMER 05088-CR1409506?1 *NEW*
APPLETON EFK-F12-Q MOUNTING COVER, NIB
B-LINE SYSTEMS LR78446 6" X 4" X 3" TYPE 12 & 13 ENCLOSURE BOX, NNB
OMRON 24VDC COIL STANDARD RELAY G7T-1112S W/ BASE 0163YH *LOT OF 5*
NUMATICS 1/4"NPT, 14.5-120PSIG-AI?R, 24VDC, SOLENOID VALVE L22BA452B017G61 *NEW*
ADVANCE 120VAC 50/60HZ 32°F BALLAST IOP-2P59-SC *NEW*
PENN 9315 TEMPERATURE CONTROL, NEW
EBM PAPST 18/17W 115V 126x126x38mm FAN W2K121-AA15-13
ATLAS COPCO TENSOR NUTRUNNER CABLE 4220 2636 05 *DAMAGED PLUG*
IDEC 110-120VAC ELECTRONIC TIMER GE1A-B
BUSSMANN 250A 700V AC/DC SEMI CONDUCTOR FUSE FWP-250A
BANNER 10-30VDC PHOTOELECTRIC SENSOR T18SP6FF50Q
BUSSMANN FUSETRON 2* 600V DUAL ELEMENT TIME DELAY FUSE FRS-R-25 *LOT OF 6*
ALLEN BRADLEY BAR CODE SCANNER CABLE 2755-CS15 SER. A *NEW*
GESIPA 12VOLTS 1,4AH BATTERY PACK FOR BLIND RIVETING TOOLS 752-1017 *NEW*
INTERNATIONAL RECTIFIER THYRISTOR MODULE 410403-24AC *NICKS*
ROSS 110/120V 50/60HZ 3 POLE SOLENOID VALVE VA-26
MAC 35-120PSI, 24VDC, 5.4W, SOLENOID VALVE 92B-FAB-000-DM-?DDAP-1DN
LEVITON LAMP HOLDER 5C401 *NEW LOT OF 7*
DATA TECHNOLOGY OPTECON ENCODER, ON35-1250-50/5
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SQUARE D 600V 10KV 50-400HZ CURRENT TRANSFORMER 780R-301
TURCK 20-250VUC PROXIMITY SENSOR Bi15-CK40-ADZ30?X2-B1131/S34
RELIANCE PROGRAMMING CONSOLE 5086 002
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OMRON 24VAC/DC SAFETY RELAY UNIT G9SA-501
MARSCHNER 25VA 115-230V TO 20VAC STEP-DOWN TRANSFORMER K66/23
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LOAD CONTROLS 120VAC COMPENSATOR PCR-1820
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ISSC PULSETRONIC 90-250VAC 3 PIN PROXIMITY SENSOR 9952-0468 *NEW*
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NAPA BELDEN 100' 16GA RED PRIMARY WIRE 732402 *NEW*
KAMOSEIKO KAMO 1/10G BALL REDUCER GEAR REDUCER BR50SH-10G-S225
MITSUBISHI ELECTRIC CONNECTOR BREAKOUT WIRING TERMINAL BOARD BB32A
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FANUC GEAR ASSEMBLY A290-7313-V524 *NEW*
MINNEAPOLIS HONEYWELL BROWN 126W2 PORTABLE POTENTIOMETER
VORTEC 701 250 PSIG PANEL GUARD ELECTRICAL ENCLOSURE COOLER
DAYKIN ELECTRIC PROGRAM PORT PPD-09
DIVERSIFIED ELECTRONICS 120VAC * @ 240VAC VOLTAGE MONITOR, UOA-120-AKA *NEW*
MARATHON 66* 600V 3-POLE POWER DISTRIBUTION BLOCK 1453587
WAGO 787-904 24.7VDC 10A AC-DC/DC-DC CONVERTER LWN 1601-6C1
HONEYWELL BURNER CONTROL UNIT RM7840 M 1017
EATON 2000LBS CAPACITY LOAD CELL 3173-2K
SANYO DENKI 24VDC 0.07A BRUSHLESS COOLING FAN 109P0424H6D04
ROSS W6476D2307 SINGLE-SPINDLE POPPET VALVE, NO BOX
TELEMECANIQUE 24V SAFETY RELAY XPSAP5140
IDEC IZUMI 120VAC 30 MIN TIME DELAY RELAY RTB CB2N *NEW*
SIGNAL TRANSFORMER 115/230V TO 48V STEP-DOWN TRANSFORMER DP-241-8-48
CAPP 120/240VAC 0-60MIN CYCLFLEX TIMER RESET 14264 *NEW*
YUSHIN 10.8-30VDC FLOW SWITCH MPS-V3RC-G-YSN
BUSSMANN 800A 600V LOW PEAK TIME DELAY FUSE KRP-C-800
GOULD SHAWMUT 600V 3-POLE POWER DISTRIBUTION BLOCK 63193
OMRON 24VDC SAFETY RELAY UNIT G9S-2001
MITSUBISHI ELECTRIC CORPORATION DIODE MODULE RM15TA-H *LOT OF 2*
KEYENCE LONG DISTANCE LASER SENSOR LV-H32
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IDEC 120V RELAY RY4S-UL WITH BASE SY4S-05 *LOT OF 5*
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DATALOGIC C-BOX RS232 TO PROFIBUS CONNECTION BOX C-BOX 310
STEARNS 230/460V .* MOTOR BRAKE, 108704100GQF REV. B *NEW*
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ADVANCE 120V 60HZ ELECTRONIC START BALLAST LSX-213-TP
PILZ 110VAC E-STOP SAFETY RELAY PNOZ 1 3S / 1O 475630
ORIENTAL MOTOR GEAR HEAD 2GN7.5K
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PAPST 24V AXIAL FAN 8414 NML
PILLAR INDUSTRIES POWER CONTROL BOARD AB6332-4(B)
OMRON TURRETT HEAD LIMIT SWITCH D4A1101N *WITHOUT BODY*
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CROUSE HINDS 3/4" FNPT FLEXIBLE FIXTURE ALC-20
ALLIED TELESYN CENTRECOM 12VDC FIBER OPTIC TRANSCEIVER AT-MX40F/ST
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TRANS-COIL SINE GUARD 600V 6A MAX 3-PHASE LINE REACTOR KLR6ATB
THOMAS & BETTS RUSSELLSTOLL 600VAC 20A 2P 3W DURATITE PLUG, 5P23U0LD *NEW*
GSC INC. GSC 4000 MOTOCON CONTROLLER 4100-1-00-20-00
GOULD SHAWMUT 600V 2 POLE POWER DISTRIBUTION BLOCK 69162
SOLA Y1000N INDUSTRIAL CONTROL TRANSFORMER, 1 kVa, NIB
RUSSELLSTOLL 250V 50A ONE WAY EVERLOK RECEPTACLE ENCLOSURE 8331 *NEW*
LINESHARE BLACK BOX 120B, 100550099028001?0
GE 3-POLE, 600VAC, 1200A SPECTRA SERIES CIRCUIT BREAKER MODULE AMC3KM MODEL 1